Modbus TCP API

This document provides a complete overview of the Modbus Slave features of the Charge Controller.
Based on revision v0.14.

1. Config UI parameters reference for Operators

Parameter name	Description
Modbus TCP Server	Allows to turn the Charge Controller into a Modbus TCP Server. This allows reading and writing parameters using the Modbus protocol. See the documentation for detailed register information.
Modbus TCP Server Base Port	Port number on which the Modbus TCP Server waits for incoming connections on connector 1. In case a second connector is supported, the configured 'port + 1' will be used for that connector.
Modbus TCP Server Register Address Set	Choose the set of register addresses that the Modbus TCP Server device will expose to its client.
Modbus TCP Server Allow Start/Stop Transaction	Allows transactions to be started/stopped from a Modbus Master device via the controller's Modbus TCP Server interface.
Modbus TCP Server Allow UID Disclose	Allows sending the UID over the Ebee Modbus TCP Server protocol

2. Modbus Unit ID

The Modbus TCP Server on the charge controller will reply to messages with any Unit ID from 1 to 255.

3. OCPP multiple connector scenarios

On an OCPP setup with 2 connectors, both controllers are accessible by connecting through the one acting as a master controller. In this case it is necessary to establish a separate connection to each charge controller.

The second connector's controller is accessible on the port corresponding to Modbus TCP Server Base Port + 1.

Assuming that the Modbus TCP Server Base Port is configured on the default port 502, the first connector can be accessed by connecting a Modbus Client to port 502, and the second connector can be accessed by connecting a separate Modbus Client to the first connector charge controller's port 503.

4. Word and byte ordering

With the notable exception of the values in the register destined to error codes (those with names prefixed with ERROR_CODES_ ) which are explained separately in their corresponding section, all other registers are to be read and written with the high byte first and the low byte after. For double registers (32-bit) the order of the words is the high word first and the low word after.

As an example, if registers 200-201 are read and contain a value of 0x0001 for register 200 and a value of 0x1F40 for register 201, these values are to be read as 0x00011F40, that is a decimal value of 73536.

5. Lowering charging current

To lower the charging currant the HEMS shall write to the Register HEMS_CURRENT_LIMIT as described in the HEMS configuration options section.

Please note the actual signaled current as indicated by the register named SIGNALED_CURRENT can be lower than the HEMS_CURRENT_LIMIT since other limitations (such as charging cable, or dynamic load management limits) could apply.

6. Supported function codes

All registers described in this document are HOLDING registers. Therefore, the only supported function codes are:

• 0x03 -- Read single register
• 0x06 -- Write single register
• 0x10 -- Write multiple registers.

7. Bulk read of registers

It is possible to read a range of registers at a time (bulk read) starting at a specified register and within the boundaries of the register section.

info

If there are gaps with undefined register numbers in this range, value '0' will be returned.

if	then
the requested range ends in the middle of a 32-bit register	the last register will be discarded and no value returned. Increase the range by 1

8. General system information

The register in the first table that follows contain general information about the system, about its status, error states, FW and protocol versions and other system and configuration information.

note on OCPP_CP_STATUS

The Charge Point Status as defined in OCPP 1.5 and 1.6 is available in the OCPP_CP_STATUS register. Note that there's some difference between the two versions, so for example the value 1, which is used for "Occupied", is only valid for OCPP 1.5 and instead in 1.6 a more detailed value is available. For the descriptions of each of the charge point status values, please refer to the OCPP specification that corresponds to the version in use.

For details on how to read and interpret the registers designated for error handling please refer to the section Error states mask mappings.

Register Addr.	Bit field	Size	Type	Name	Description
100-101	31:0	32-Bit	READ	FIRMWARE_VERSION	Ebee Application version number. example: 0.91 = (0x30, 0x2E, 0x39, 0x31), 4.40 = (0x34, 0x2E, 0x34, 0x34).
104	15:0	16-Bit	READ	OCPP_CP_STATUS	0 = Available 1 = Occupied 2 = Reserved 3 = Unavailable 4 = Faulted 5 = Preparing 6 = Charging 7 = SuspendedEVSE 8 = SuspendedEV 9 = Finishing
105-106	31:0	32-Bit	READ	ERROR_CODES_1	See Error states mask mappings section for mask bit values.
107-108	63:32	32-Bit	READ	ERROR_CODES_2
109-110	95:64	32-Bit	READ	ERROR_CODES_3
111-112	127:96	32-Bit	READ	ERROR_CODES_4
120-121	31:0	32-Bit	READ	PROTOCOL_VERSION	Ebee Modbus Slave Protocol Version number (example: 0.6 = 54). This corresponds to the Doc. Revision at the top of this document.
122	15:0	16-Bit	READ	VEHICLE_STATE	Control Pilot vehicle state in decimal format: A = 1, B = 2, C = 3, D = 4, E = 5
124	15:0	16-Bit	READ & WRITE	CP_AVAILABILITY	Read or set the Charge Point availability. 0 = Operative. 1 = Inoperative.
131	15:0	16-Bit	READ & WRITE	SAFE_CURRENT	Max. charge current under communication failure with the Modbus Master.
168-169	31:0	32-Bit	READ	MANU_SERIAL_1	Identifies the serial number as set by the Manufacturer. This is a non-null terminated ASCII string of maximum 25 characters. If the string is fewer than 25 characters, it is padded on the left (the lowermost registers) with blank-space ASCII characters.
170-171	63:32	32-Bit	READ	MANU_SERIAL_2
172-173	95:64	32-Bit	READ	MANU_SERIAL_3
174-175	127:96	32-Bit	READ	MANU_SERIAL_4
176-177	159:128	32-Bit	READ	MANU_SERIAL_5
178-179	191:160	32-Bit	READ	MANU_SERIAL_6
180	207:192	16-Bit	READ	MANU_SERIAL_7

9. Meter values from OCPP primary meter

Meter values are unsigned and sent in 32-bit words.

tip

When not available, registers contain a 0xffffffff value to indicate that no meter value for the requested register is present.

if	because	then
the line-specific power and energy isn't available	the installation is single-phased	only the Total Power and Total Energy is available
	the meter doesn't support readings

tip

For maintaining backwards compatibility with previous systems, where the METER_TOTAL_ENERG and METER_TOTAL_POW registers were not present, the Total Power and Total Energy values can also be read from the Power and Energy registers corresponding to L1. In that case, the Power and Energy registers for L2 and L3 will return 0xffffffff.

Register Addr.	Bit field	Size	Type	Name	Description
200-201	31:0	32-Bit	READ	METER_ENERG_L1	Energy in Wh (phase 1) from primary meter
202-203	31:0	32-Bit	READ	METER_ENERG_L2	Energy in Wh (phase 2) from primary meter
204-205	31:0	32-Bit	READ	METER_ENERG_L3	Energy in Wh (phase 3) from primary meter
206-207	31:0	32-Bit	READ	METER_POW_L1	Power in W (phase 1) from primary meter
208-209	31:0	32-Bit	READ	METER_POW_L2	Power in W (phase 2) from primary meter
210-211	31:0	32-Bit	READ	METER_POW_L3	Power in W (phase 3) from primary meter
212-213	31:0	32-Bit	READ	METER_CUR_L1	Current in mA (phase 1) from primary meter
214-215	31:0	32-Bit	READ	METER_CUR_L2	Current in mA (phase 2) from primary meter
216-217	31:0	32-Bit	READ	METER_CUR_L3	Current in mA (phase 3) from primary meter
218-219	31:0	32-Bit	READ	METER_TOTAL_ENERG	Total Energy in Wh from primary meter
220-221	31:0	32-Bit	READ	METER_TOTAL_POW	Total Power in W from primary meter
222-223	31:0	32-Bit	READ	METER_VOL_L1	Voltage in V (phase 1) from primary meter
224-225	31:0	32-Bit	READ	METER_VOL_L2	Voltage in V (phase 2) from primary meter
226-227	31:0	32-Bit	READ	METER_VOL_L3	Voltage in V (phase 3) from primary meter

10. Dynamic Load Management (DLM)

This is information mostly concerning the DLM Master. Everything except for register 600 will be available only for devices with a DLM Master role set (meaning a value of 1 or 2 is returned on this register). | -->

Register Addr.	Bit field	Size	Type	Name	Description
600	15:0	16-Bit	READ	DLM_MODE	Indicates the DLM mode configured for this device. The following values represent each mode: 0 = Disabled 1 = DLM Master (With internal DLM-Slave) 2 = DLM Master (Standalone) 3 = DLM Slave (Master-Auto-Discovery) 4 = DLM Slave (Master-Fixed-IP)
610	15:0	16-Bit	READ	DLM_EVSE_SUB_DISTRIBUTION_LIMIT_L1	Overall current limit for DLM available for distribution to Evs. These three registers are for L1, L2, and L3 respectively and the values are in Amps.
611	15:0	16-Bit	READ	DLM_EVSE_SUB_DISTRIBUTION_LIMIT_L2
612	15:0	16-Bit	READ	DLM_EVSE_SUB_DISTRIBUTION_LIMIT_L3
613	15:0	16-Bit	READ & WRITE	DLM_OPERATOR_EVSE_SUB_DISTRIBUTION_LIMIT_L1	Operator current limit for DLM available for distribution to EVs. The 'Operator EVSE Sub-Distribution Limit' is equal or smaller than the 'EVSE Sub-Distribution Limit'. These three registers are for L1, L2, and L3 respectively and the values are in Amps.
614	15:0	16-Bit	READ & WRITE	DLM_OPERATOR_EVSE_SUB_DISTRIBUTION_LIMIT_L2
615	15:0	16-Bit	READ & WRITE	DLM_OPERATOR_EVSE_SUB_DISTRIBUTION_LIMIT_L3
620	15:0	16-Bit	READ	DLM_EXTERNAL_METER_SUPPORT	If enabled, an external, secondary meter allows to also consider the power consumption of additional load. The power available for charging EVs will be adjusted accordingly. Please make sure, 'Meter configuration (Second)' is configured, preferrably to a 3-phase, phase aware meter. Value of this register is 1 when enabled, 0 when disabled.
621	15:0	16-Bit	READ	DLM_NUM_SLAVES_CONNECTED	The number of DLM Slaves connected to this Master device.
630	15:0	16-Bit	READ	DLM_OVERALL_CURRENT_APPLIED_L1	Overall Current the DLM Master is currently applying (sum of current distributed among the slaves). These three registers are for L1, L2, and L3 respectively and the values are in Amps.
631	15:0	16-Bit	READ	DLM_OVERALL_CURRENT_APPLIED_L2
632	15:0	16-Bit	READ	DLM_OVERALL_CURRENT_APPLIED_L3
633	15:0	16-Bit	READ	DLM_OVERALL_CURRENT_AVAILABLE_L1	Overall Current the DLM Master has available to distribute among the slaves. These three registers are for L1, L2, and L3 respectively and the values are in Amps.
634	15:0	16-Bit	READ	DLM_OVERALL_CURRENT_AVAILABLE_L2
635	15:0	16-Bit	READ	DLM_OVERALL_CURRENT_AVAILABLE_L3

11. Charge process information

Charge process information is information collected during, or inferred from, the charging process.

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Deprecation Note

Registers

• 705
• 709

are deprecated and only to be used for clients that implement until version 10 of this protocol.

When using version	Use
< version 10 of this protocol	705 and 609
>= version 11 of this protocol	instead of 705 → 716-717 instead of 705 → 709

The older registers can still be read in newer versions for backwards compatibility, but it is discouraged to do so in newer implementations.

Once the values in those registers reach their maximum, they will stay at the maximum value until the next session is started or until the charging process is finished according to each case.

Register Addr.	Bit field	Size	Type	Name	Description
701-702	31:0	32-Bit	READ	SCHED_DEP_TIME_15118	Scheduled departure time (format is hhmmss in big-endian packed BCD with left zero padding) – 15118 only
703-704	31:0	32-Bit	READ	SCHED_DEP_DATE_15118	Scheduled departure time (format is ddmmyy in big-endian packed BCD with left zero padding) – 15118 only
705	15:0	16-Bit	READ	DEPRECATED CHARGED_ENERGY	(Please see the note above this table.)
706	15:0	16-Bit	READ	SIGNALED_CURRENT	The maximum current that’s being signaled to the EV for charging
707-708	31:0	32-Bit	READ	START_TIME	Format is the same as in SCHED_DEP_TIME_15118
709	15:0	16-Bit	READ	DEPRECATED CHARGE_DURATION	(Please see the note above this table.)
710-711	31:0	32-Bit	READ	END_TIME	Format is the same as in SCHED_DEP_TIME_15118
712	15:0	16-Bit	READ	MINIMUM_CUR_LIMIT	Minimum current limit for charging.
713-714	31:0	32-Bit	READ	REQ_ENERGY_15118	EV Required Energy – 15118 only
715	15:0	16-Bit	READ	MAX_CUR_EV	This is the maximum current with which the EV can charge. It may come from the cable's PR value in analog vehicles, or from the maximum reported by the vehicle via 15118, whichever is lower.
716-717	31:0	32-Bit	READ	CHARGED_ENERGY	Sum of charged energy for the current session (Wh). The amount of charged energy will stay at its maximum until the next session is started
718-719	31:0	32-Bit	READ	CHARGE_DURATION	Duration of the charging process in seconds
720-721	31:0	32-Bit	READ	READ_IDTAG_1	OCPP IdTag. This is a non-null terminated string with a max. length of 20 bytes, represented here in five 32-bit registers (or ten consecutive 16-bit regs.). The string is padded with blank-space characters on the left, or completely filled with blank-space characters when no IdTag is present. When a charging session is not in progress or the IdTag is not available these registers contain all ASCII-whitespaces.
722-723	31:0	32-Bit	READ	READ_IDTAG_2
724-725	31:0	32-Bit	READ	READ_IDTAG_3
726-727	31:0	32-Bit	READ	READ_IDTAG_4
728-729	31:0	32-Bit	READ	READ_IDTAG_5
730	15:0	16-Bit	READ	EV_RESS_SOC	State of charge of the EV’s battery (Rechargeable Energy Storage System) – 15118 only.
740	15:0	16-Bit	READ	SMART_EV_DETECTED_15118	Returns 1 if an EV currently connected is a smart vehicle, or 0 if no EV connected or it is not a smart vehicle.
741-742	31:0	32-Bit	READ	EVCCID_15118_1	ASCII representation of the Hex. Values corresponding to the EVCCID. The EVCCID value is 6 bytes, so the ASCII Hex. representation of it has a length of exactly 12 bytes. This is a non-null terminated string. Values are all zero when no vehicle is connected, or when the vehicle is not a 15118-capable smart vehicle.
743-744	31:0	32-Bit	READ	EVCCID_15118_2
745-746	31:0	32-Bit	READ	EVCCID_15118_3
747	31:0	32-Bit	READ	REM_TIME_TO_FULL_SOC	Returns the remaining time in seconds to full SoC – 15118 only.
749	15:0	16-Bit	READ	IS_IN_CHARGING_LOOP_15118	Returns 1 if the EV/EVSE are on a charging loop, 0 otherwise.
750-751	31:0	32-Bit	READ	DC_POWER_DELIVERY	Returns the DC power currently delivered in Watts.
752	15:0	16-Bit	READ	AUTH_SOURCE	Source of authorization. Possible values: 0 = NONE 1 = RFID 2 = INPUT_SWITCH 3 = REMOTE 4 = 15118 5 = AUTOCHARGE 6 = FREECHARGING 7 = POWER_LOSS

12. HEMS configuration options

Register Addr.	Bit field	Size	Type	Name	Description
1000	15:0	16-bit	READ & WRITE	HEMS_CURRENT_LIMIT	Current limit of the HEMS module in Amps. This register is intended to be modified by an Energy Manager. If the charge session shall be paused, the register needs to be set to "0"

13. Authorization with IDTag

Please note that for these registers to be enabled, the corresponding option must be set in the controller HEMS/Modbus setting named Modbus Slave Allow Start/Stop Transaction.

When writing to these registers, the effect will be exactly the same as if one physically presented an RFID card in fron of the card reader. That means it will start/stop the transaction accordingly based on each scenario's workflow.

Note that the registers in this table are WRITE only. To READ the IDTAG currently in use please refer to the registers prefixed with READ_ID_TAG_ on their name.

Register Addr.	Bit field	Size	Type	Name	Description
1110-1111	31:0	32-Bit	WRITE	WRITE_IDTAG_1	Same format as registers 720-729. If the IdTag string is fewer than 20 characters, it must be padded on the left (the lowermost registers) with blank-space ASCII characters.
1112-1113	31:0	32-Bit	WRITE	WRITE_IDTAG_2
1114-1115	31:0	32-Bit	WRITE	WRITE_IDTAG_3
1116-1117	31:0	32-Bit	WRITE	WRITE_IDTAG_4
1118-1119	31:0	32-Bit	WRITE	WRITE_IDTAG_5

14. Error states mask mappings

In order to represent any simultaneous error states, the value read from the ERROR_CODES registers can be AND'ed with different mask mappings to identify which individual errors may be present at any given time in the system.

Since only bits 0 to 21 are used in the current specification, it is possibly to read only from registers 111-112 in order to optimize the fetching of values.

For completion however, it is clarified here how to read and interpret the values when reading all 8 registers.

To test for each error individually, the resulting value of reading all registers has to be masked against the corresponding error mask. An example is given below on how to achieve this.

Supposing the following value (presented here in HEX) is read from the ERROR_CODES registers:

Register: 105-106 107-108 109-110 111-112

Value: 0000 0000 0000 0000 0000 0000 4100 0000

Please focus first in the value of registers 111-112.

The bits of a double word are numbered from 0 through 31 with bit 0 being the least significant bit. The word containing bit 0 is the low word and the word containing bit 31 is the high word. Each 32-bit register has the low word first, and each word has the low byte first.

So in the case of registers 111-112 the words must first be inverted, to get a value of 0000 4100, and then the bytes of each word must be inverted too, in order to get a value of 0000 0041.

That is to be done for each register pair (105-106, 107-108, 109-110, 111-112), and once it is done, then the whole resulting value can be simply assembled from all registers by starting from a value of 0, and going through each word (register) in order, first shifting to the left then adding.

The result from the case above would be:

0000 0000 0000 0000 0000 0000 0000 0041

Finally, to identify which individual errors are present this value must be AND'ed to each error mask. So by doing the following operation:

0000 0000 0000 0000 0000 0000 0000 0041

AND

0000 0000 0000 0000 0000 0000 0000 0001

Ii is possible to identify that an error "ERR_RCMB_TRIGGERED" is present.

And by continuing doing for example:

0000 0000 0000 0000 0000 0000 0000 0041

AND

0000 0000 0000 0000 0000 0000 0000 0040

It can be observed that also there is an error "ERR_CONTACTOR_WELD" present.

---

Mask values for bits 0 to 26 (LSB 0) are specified in the following table. Bits 27 to 127 are reserved.

Bit number (LSB 0)	Mask Value	Mask Name	Description
0	0x01	ERR_RCMB_TRIGGERED	Residual current detected via sensor.
1	0x02	ERR_VEHICLE_STATE_E	Vehicle signals error.
2	0x04	ERR_MODE3_DIODE_CHECK	Vehicle diode check failed - tamper detection.
3	0x08	ERR_MCB_TYPE2_TRIGGERED	MCB of type 2 socket triggered.
4	0x10	ERR_MCB_SCHUKO_TRIGGERED	MCB of domestic socket triggered.
5	0x20	ERR_RCD_TRIGGERED	RCD triggered.
6	0x40	ERR_CONTACTOR_WELD	Contactor welded.
7	0x80	ERR_BACKEND_DISCONNECTED	Backend disconnected.
8	0x100	ERR_ACTUATOR_LOCKING_FAILED	Plug locking failed.
9	0x200	ERR_ACTUATOR_LOCKING_WITHOUT_PLUG_FAILED	Locking without plug error.
10	0x400	ERR_ACTUATOR_STUCK	Actuator stuck cannot unlock.
11	0x800	ERR_ACTUATOR_DETECTION_FAILED	Actuator detection failed.
12	0x1000	ERR_FW_UPDATE_RUNNING	FW Update in progress.
13	0x2000	ERR_TILT	The charge point is tilted.
14	0x4000	ERR_WRONG_CP_PR_WIRING	CP/PR wiring issue
15	0x8000	ERR_TYPE2_OVERLOAD_THR_2	Car current overload, charging stopped.
16	0x10000	ERR_ACTUATOR_UNLOCKED_WHILE_CHARGING	Actuator unlocked while charging.
17	0x20000	ERR_TILT_PREVENT_CHARGING_UNTIL_REBOOT	The charge point was tilted and it is not allowed to charge until the charge point is rebooted.
18	0x40000	ERR_PIC24	PIC24 error.
19	0x80000	ERR_USB_STICK_HANDLING	USB stick handling in progress.
20	0x100000	ERR_INCORRECT_PHASE_INSTALLATION	Incorrect phase rotation direction detected.
21	0x200000	ERR_NO_POWER	No power on mains detected.
22	0x400000	ERR_METER_SECOND_NOT_COMMUNICATING	Meter second not communicating.
23	0x800000	ERR_MONITORING_RELAY_INPUT_TRIGGERED	RCD-MCB Unique input triggered.
24	0x1000000	ERR_STATE_D	Charging is paused because state D is detected.
25	0x2000000	DC_ERR_DOOR_OPEN	DC wallbox door is open
26	0x4000000	ERR_RCD_MAYBE_TRIGGERED	RCD maybe triggered, detected by communication (power) loss on primary meter

15. Error events mask mappings

The same as described in chapter above applies here, except:

Supposing the following value (presented here in HEX) is read from the ERR_EVT_CODES registers:

Register: 158-159 160-161 162-163 164-165

Value: 0000 0000 0000 0000 0000 0000 4100 0000

Please focus first in the value of registers 164-165.

Bit number (LSB 0)	Mask Value	Mask Name	Description
0	0x01	ERR_EVENT_ACTUATOR_LOCK	unused
1	0x02	ERR_EVENT_ACTUATOR_LOCK_WITHOUT_PLUG	unused
2	0x04	ERR_EVENT_REBOOT_IN_PROGRESS	Charge point reboot was issued
3	0x08	ERR_EVENT_AUTHORIZATION_FAILED	Authorization failed
4	0x10	ERR_EVENT_AUTHORIZATION_FAILED_NO_STATUSNOTIF	Authorization failed (w/o notification of OCPP backend)
5	0x20	ERR_EVENT_FW_UPDATE_PAUSED_ACTIVE_TRANSACTION	unused
6	0x40	ERR_EVENT_FW_UPDATE_FAILURE	Firmware update failed (internet connection?).
7	0x80	ERR_EVENT_FW_UPDATE_ROLLED_BACK_AFTER_FAILURE	unused
8	0x100	ERR_EVENT_FW_UPDATE_PACKAGE_MANAGER_FAULT	Firmware update failed because the package manager refused the update.
9	0x200	ERR_EVENT_MONITORING_UNINTENDED_RESET	Unintended Reset - Power Outage?
10	0x400	ERR_EVENT_TRANSACTION_STOPPED_AFTER_RESET	ChargePoint rebooted while a transaction (charging) was active. Transaction was implicitely terminated.
11	0x800	ERR_EVENT_SLAVE_DISCONNECTED	A slave disconnected from the master.
12	0x1000	ERR_EVENT_DIAGNOSTICS_FAILURE	Diagnostics failed (internet connection?).
13	0x2000	ERR_EVENT_RCMB_ERROR	RCMB error
14	0x4000	ERR_EVENT_TEMPERATURE_ALERT	unused
15	0x8000	ERR_EVENT_15118_COMMUNICATION_FAILURE	TCP/TLS 15118 communication failed
16	0x10000	ERR_EVENT_15118_AUTHORIZATION_FAILURE	15118 authorization for PnC failed. The signature validation failed
17	0x20000	ERR_EVENT_15118_AUTHENTICATION_FAILURE	15118 authentication for PnC failed
18	0x40000	ERR_EVENT_15118_CERT_INSTALLATION_FAILURE	15118 Certificate Installation failed
19	0x80000	ERR_EVENT_15118_DEPARTURE_TIME	15118 departure time received
20	0x100000	ERR_EVENT_15118_EAMOUNT	15118 Energy Amount received
21	0x200000	ERR_EVENT_15118_V2G_SEQUENCE_TIMEOUT	15118 V2G Sequence timeout
22	0x400000	ERR_EVENT_15118_V2G_SEQUENCE_ERROR	15118 V2G Sequence error
23	0x800000	ERR_EVENT_15118_DC_CABLE_CHECK	Cable Check error - Not in state C/D
24	0x1000000	ERR_EVENT_15118_DC_POWER_STOP	Power stop error - Not in state B
25	0x2000000	ERR_EVENT_15118_DC_ISOLATION_FAULT	Cable isolation fault
26	0x4000000	ERR_EVENT_15118_DC_UNEXPECTED_CP_STATE	Unexpected CP state
27	0x8000000	ERR_EVENT_15118_DC_EVSE_INITIATED_SHUTDOWN	EVSE normal shutdown
28	0x10000000	ERR_EVENT_GENERIC_INFORM	Generic event
29	0x20000000	ERR_EVENT_IDTAG_ADDED_OK	Adding tag to Auth List or FLL succeeded
30	0x40000000	ERR_EVENT_IDTAG_ADDED_FAILURE	Adding tag to Auth List or FLL failed
31	0x80000000	ERR_EVENT_SYSTEM_NOT_READY	System not yet ready

16. Appendix

16.1. Exhaustive list of Modbus registers

Here's an exhaustive list of Modbus registers for convinience:

info

All data is transferred in network byte order/big endian.

Device/Protocol	Reg. Type	Address	Name	R/W	Nr. Regs.	Description
Phoenix	Input	100	EV Status	R	1	Returns the Control Pilot state
Phoenix	Input	101	Proximity Current	R	1	Returns signaled current in Amps
Phoenix	Input	102	Charging Time (seconds)	R	2	Duration since beginning of charge
Phoenix	Input	104	Legacy	R	1	Do not use.
Phoenix	Input	105	Firmware Version	R	2	Returns the Ebee Application version number. Example: 0.91 = (0x30, 0x2E, 0x39, 0x31) 4.40 = (0x34, 0x2E, 0x34, 0x34).
Phoenix	Input	107	Legacy	R	1	Do not use.
Phoenix	Input	108	Voltage L1	R	2	Returns the voltage of phase 1 of the ocpp meter in V.
Phoenix	Input	110	Voltage L2	R	2	Returns the voltage of phase 2 of the ocpp meter in V.
Phoenix	Input	112	Voltage L3	R	2	Returns the voltage of phase 3 of the ocpp meter in V.
Phoenix	Input	114	Current L1	R	2	Returns the current of phase 1 of the ocpp meter in mA.
Phoenix	Input	116	Current L2	R	2	Returns the current of phase 2 of the ocpp meter in mA.
Phoenix	Input	118	Current L3	R	2	Returns the current of phase 3 of the ocpp meter in mA.
Phoenix	Input	120	Total Power (OCPP Meter Power)	R	2	Returns the power read from the ocpp meter in W.
Phoenix	Input	122	Reactive Power	R	2
Phoenix	Input	124	Real Power	R	2
Phoenix	Input	126	Power Factor	R	2
Phoenix	Input	128	Energy	R	2	Energy read from meter in Wh
Phoenix	Input	130	Max. power ever seen from OCPP Meter	R	2	Max. power value ever seen since boot
Phoenix	Input	132	Charged Energy (Wh)	R	2	Sum of charged energy for the current session
Phoenix	Input	134	Grid Frequency	R	2	Returns the frequency read from the ocpp meter in Hz.
Phoenix	Input	136	Assumed Maximum Charging Current L1	R	2
Phoenix	Input	138	Assumed Maximum Charging Current L2	R	2
Phoenix	Input	140	Assumed Maximum Charging Current L3	R	2
Phoenix	Input	200	Input values	R	1
Phoenix	Input	201	-	R	1	-
Phoenix	Input	202	Plug lock detect	R	1	Status of plug lock detection
Phoenix	Input	203	-	R	1	-
Phoenix	Input	204	-	R	1	-
Phoenix	Input	205	-	R	1	-
Phoenix	Input	206	-	R	1	-
Phoenix	Input	207	-	R	1	-
Phoenix	Input	208	-	R	1	-
Phoenix	Holding	310	IP Address - 1st Octet	R	1	Get the IP address of the active interface connected to the backend.
Phoenix	Holding	311	IP Address - 2nd Octet	R	1	Get the IP address of the active interface connected to the backend.
Phoenix	Holding	312	IP Address - 3rd Octet	R	1	Get the IP address of the active interface connected to the backend.
Phoenix	Holding	313	IP Address - 4th Octet	R	1	Get the IP address of the active interface connected to the backend.
TQ-DM100	Holding	1000	Charge Point State	R	1
TQ-DM100	Holding	1001	Charge State	R	1
TQ-DM100	Holding	1002	EVSE State	R	1
TQ-DM100	Holding	1004	Cable State	R	1
TQ-DM100	Holding	1006	EVSE Error Code	R	1
TQ-DM100	Holding	1008	Current L1	R	1	Returns the current of phase 1 of the ocpp meter in mA.
TQ-DM100	Holding	1010	Current L2	R	1	Returns the current of phase 2 of the ocpp meter in mA.
TQ-DM100	Holding	1012	Current L3	R	1	Returns the current of phase 3 of the ocpp meter in mA.
TQ-DM100	Holding	1020	Active Power	R	2
TQ-DM100	Holding	1024	Active Power L1	R	2
TQ-DM100	Holding	1028	Active Power L2	R	2
TQ-DM100	Holding	1032	Active Power L3	R	2
TQ-DM100	Holding	1036	Energy	R	2
TQ-DM100	Holding	1100	Hardware current limit	R	1
TQ-DM100	Holding	1102	Minimum current limit	R	1
TQ-DM100	Holding	1104	Max. Current from EVSE	R	1
TQ-DM100	Holding	1106	Max. Current from Cable	R	1
TQ-DM100	Holding	1108	Max. Current from EV	R	1
TQ-DM100	Holding	1200	User priority	R	1
TQ-DM100	Holding	1300	EV Battery State (% 0-100)	R	1	Returns an estimate of the SoC
TQ-DM100	Holding	1302	EV Battery Capacity (Wh)	R	2	Returns an estimate of the EV Battery Capacity
TQ-DM100	Holding	1400	Schedule Type	R	1
TQ-DM100	Holding	1402	Required Energy (Wh)	R	2
TQ-DM100	Holding	1406	Required Battery State (% 0-100)	R	1
TQ-DM100	Holding	1408	Scheduled Time (hhmmss)	R	2
TQ-DM100	Holding	1412	Scheduled Date (yymmdd)	R	2
TQ-DM100	Holding	1502	Charged Energy (Wh)	R	1	Sum of charged energy for the current session
TQ-DM100	Holding	1504	Start Time (hhmmss)	R	2	Start time of charging process
TQ-DM100	Holding	1508	Charging Time (seconds)	R	2	Duration since beginning of charge
TQ-DM100	Holding	1512	End Time (hhmmss)	R	2	End time of charging process
TQ-DM100	Holding	1600	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 0 to 3.
TQ-DM100	Holding	1602	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 4 to 7.
TQ-DM100	Holding	1604	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 8 to 11.
TQ-DM100	Holding	1606	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 12 to 15.
TQ-DM100	Holding	1608	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 16 to 19.
TQ-DM100	Holding	1620	15118 Smart vehicle detected	R	1	Returns 1 if an EV currently connected is a smart vehicle, or 0 if no EV connected or it is not a smart vehicle
TQ-DM100	Holding	2000	Safe Current (Amps.)	R/W	1	Max. charge current under communication failure
TQ-DM100	Holding	2002	Comm. Timeout (seconds)	R/W	1	Communication timeout
TQ-DM100	Holding	5000	Charge Power (W)	W	2
TQ-DM100	Holding	5004	Charge Current (A)	W	1
TQ-DM100	Holding	5006	Charge Control		1	Unimplemented
TQ-DM100	Holding	5008	Charge Release		1	Unimplemented
TQ-DM100	Holding	5900	Free Charging	R/W	1	Unimplemented
TQ-DM100	Holding	5902	Free Charging Mode	R/W	1	Unimplemented
TQ-DM100	Holding	6000	Life Bit	R/W	1	0/1 Toggle-Bit
Open Modbus Charge Control Interface (OMCCI)	Holding	100	Firmware Version	R	2	Returns the Ebee Application version number. Example: 0.91 = (0x30, 0x2E, 0x39, 0x31) 4.40 = (0x34, 0x2E, 0x34, 0x34).
Open Modbus Charge Control Interface (OMCCI)	Holding	104	OCPP CP Status	R	1	Charge Point status according to the OCPP spec. enumeration
Open Modbus Charge Control Interface (OMCCI)	Holding	105	Error Codes 1	R	2	Aggregated error states (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	107	Error Codes 2	R	2	Aggregated error states (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	109	Error Codes 3	R	2	Aggregated error states (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	111	Error Codes 4	R	2	Aggregated error states (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	120	Protocol Version	R	2	Ebee Modbus TCP Server Protocol Version number (example: 0.6 = {0x30, 0x2E, 0x36}).
Open Modbus Charge Control Interface (OMCCI)	Holding	122	Vehicle (Control Pilot) state	R	1	A=1, B=2, C=3, D=4, E=5
Open Modbus Charge Control Interface (OMCCI)	Holding	123	Vehicle (Control Pilot) state in Hex. format	R	1	A = 0x0A, B = 0x0B, etc.
Open Modbus Charge Control Interface (OMCCI)	Holding	124	Charge Point availability	R/W	1	Get/Set available/unavailable
Open Modbus Charge Control Interface (OMCCI)	Holding	131	Safe Current (Amps.)	R/W	1	Max. charge current under communication failure
Open Modbus Charge Control Interface (OMCCI)	Holding	132	Comm. Timeout (seconds)	R/W	1	Communication timeout
Open Modbus Charge Control Interface (OMCCI)	Holding	133	Hardware current limit	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	134	Operator current limit	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	135	RCMB Mode	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	136	RCMB Last RMS value (integral part)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	137	RCMB Last RMS value (fractional part)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	138	RCMB Last DC value (integral part)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	139	RCMB Last DC value (fractional part)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	140	Relays State	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	141	Device ID	R	1	This register is a device identifier and always returns the value 0xEBEE (decimal 60398)
Open Modbus Charge Control Interface (OMCCI)	Holding	142	ChargePoint Model	R	2	ChargePoint Model. Bytes 0 to 3.
Open Modbus Charge Control Interface (OMCCI)	Holding	144	ChargePoint Model	R	2	ChargePoint Model. Bytes 4 to 7.
Open Modbus Charge Control Interface (OMCCI)	Holding	146	ChargePoint Model	R	2	ChargePoint Model. Bytes 8 to 11.
Open Modbus Charge Control Interface (OMCCI)	Holding	148	ChargePoint Model	R	2	ChargePoint Model. Bytes 12 to 15.
Open Modbus Charge Control Interface (OMCCI)	Holding	150	ChargePoint Model	R	2	ChargePoint Model. Bytes 16 to 19.
Open Modbus Charge Control Interface (OMCCI)	Holding	152	Plug lock detect	R	1	Status of plug lock detection
Open Modbus Charge Control Interface (OMCCI)	Holding	153	Firmware Version	R	1	Returns the Ebee Application major version number
Open Modbus Charge Control Interface (OMCCI)	Holding	154	Firmware Version	R	1	Returns the Ebee Application minor version number
Open Modbus Charge Control Interface (OMCCI)	Holding	155	Firmware Version	R	1	Returns the Ebee Application patch version number
Open Modbus Charge Control Interface (OMCCI)	Holding	156	Build Number	R	2	Returns the Ebee Application build number
Open Modbus Charge Control Interface (OMCCI)	Holding	158	Error Events 1	R	2	Aggregated error events (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	160	Error Events 2	R	2	Aggregated error events (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	162	Error Events 3	R	2	Aggregated error events (see Spec. sheet for mask mappings)
Open Modbus Charge Control Interface (OMCCI)	Holding	164	Error Events 4	R	2	Aggregated error events (see Spec. sheet for mask mappings) no error code --- 0x1 no error code --- 0x2 no error code --- 0x4 no error code --- 0x8 no error code --- 0x10 01-02-017 --- 0x20 01-02-018 --- 0x40 no error code --- 0x80 01-03-005 --- 0x100 01-04-001 --- 0x200 01-04-010 --- 0x400 01-04-009 --- 0x800 01-04-006 --- 0x1000 01-04-008 --- 0x2000 01-04-011 --- 0x4000 01-04-012 --- 0x8000 01-04-013 --- 0x10000 01-04-002 --- 0x20000 01-04-003 --- 0x40000 01-06-002 --- 0x80000 01-03-007 --- 0x100000
Open Modbus Charge Control Interface (OMCCI)	Holding	166	Free Charging	R/W	1	0 = Free charging disabled, 1 = Free charging enabled
Open Modbus Charge Control Interface (OMCCI)	Holding	167	Free Charging Mode	R/W	1	Modes 0 to 5 (see Spec. sheet for details)
Open Modbus Charge Control Interface (OMCCI)	Holding	168	Manufacturer serial number	R	2	Manufacturer serial number. Bytes 0 to 3.
Open Modbus Charge Control Interface (OMCCI)	Holding	170	Manufacturer serial number	R	2	Manufacturer serial number. Bytes 4 to 7.
Open Modbus Charge Control Interface (OMCCI)	Holding	172	Manufacturer serial number	R	2	Manufacturer serial number. Bytes 8 to 11.
Open Modbus Charge Control Interface (OMCCI)	Holding	174	Manufacturer serial number	R	2	Manufacturer serial number. Bytes 12 to 15.
Open Modbus Charge Control Interface (OMCCI)	Holding	176	Manufacturer serial number	R	2	Manufacturer serial number. Bytes 16 to 19.
Open Modbus Charge Control Interface (OMCCI)	Holding	178	Manufacturer serial number	R	2	Manufacturer serial number. Bytes 20 to 23.
Open Modbus Charge Control Interface (OMCCI)	Holding	180	Manufacturer serial number	R	1	Manufacturer serial number. Byte 24 and '
Open Modbus Charge Control Interface (OMCCI)	Holding	182	Phytec-Board temperature	R/W	2	Phytec-Board temperature from comtraxx system
Open Modbus Charge Control Interface (OMCCI)	Holding	184	Reservation expiry time	R	2	Reservation expiry time
Open Modbus Charge Control Interface (OMCCI)	Holding	200	Energy L1	R	2	Energy in Wh. (phase 1) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	202	Energy L2	R	2	Energy in Wh. (phase 2) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	204	Energy L3	R	2	Energy in Wh. (phase 3) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	206	Power L1	R	2	Power in W (phase 1) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	208	Power L2	R	2	Power in W (phase 2) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	210	Power L3	R	2	Power in W (phase 3) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	212	Current L1	R	2	Current in mA (phase 1) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	214	Current L2	R	2	Current in mA (phase 2) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	216	Current L3	R	2	Current in mA (phase 3) from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	218	Total Energy	R	2	Total Energy in Wh. from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	220	Total Power	R	2	Total Power in Wh. from primary meter
Open Modbus Charge Control Interface (OMCCI)	Holding	222	Voltage L1	R	2	Returns the voltage of phase 1 of the ocpp meter in V.
Open Modbus Charge Control Interface (OMCCI)	Holding	224	Voltage L2	R	2	Returns the voltage of phase 2 of the ocpp meter in V.
Open Modbus Charge Control Interface (OMCCI)	Holding	226	Voltage L3	R	2	Returns the voltage of phase 3 of the ocpp meter in V.
Open Modbus Charge Control Interface (OMCCI)	Holding	500	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	501	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	502	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	503	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	504	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	505	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	506	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	507	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	508	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	509	(Reserved)	R	1
Open Modbus Charge Control Interface (OMCCI)	Holding	600	DLM Mode	R	1	Indicates the DLM mode configured for this device.
Open Modbus Charge Control Interface (OMCCI)	Holding	610	DLM EVSE Sub-distribution Limit L1	R	1	Overall current limit for DLM available for EVs
Open Modbus Charge Control Interface (OMCCI)	Holding	611	DLM EVSE Sub-distribution Limit L2	R	1	Overall current limit for DLM available for EVs
Open Modbus Charge Control Interface (OMCCI)	Holding	612	DLM EVSE Sub-distribution Limit L3	R	1	Overall current limit for DLM available for EVs
Open Modbus Charge Control Interface (OMCCI)	Holding	613	DLM Operator EVSE Sub-distribution Limit L1	R/W	1	Operator current limit for DLM available for distribution to EVs
Open Modbus Charge Control Interface (OMCCI)	Holding	614	DLM Operator EVSE Sub-distribution Limit L2	R/W	1	Operator current limit for DLM available for distribution to EVs
Open Modbus Charge Control Interface (OMCCI)	Holding	615	DLM Operator EVSE Sub-distribution Limit L3	R/W	1	Operator current limit for DLM available for distribution to EVs
Open Modbus Charge Control Interface (OMCCI)	Holding	620	DLM External Meter support	R	1	Value of this register is 1 when External Meter is enabled, 0 when disabled
Open Modbus Charge Control Interface (OMCCI)	Holding	621	DLM Number of Slaves connected	R	1	The number of DLM Slaves connected to this Master device
Open Modbus Charge Control Interface (OMCCI)	Holding	630	DLM Overall Current applied L1	R	1	Overall Current (A) the DLM Master is currently applying (sum of current distributed among the slaves)
Open Modbus Charge Control Interface (OMCCI)	Holding	631	DLM Overall Current applied L2	R	1	Overall Current (A) the DLM Master is currently applying (sum of current distributed among the slaves)
Open Modbus Charge Control Interface (OMCCI)	Holding	632	DLM Overall Current applied L3	R	1	Overall Current (A) the DLM Master is currently applying (sum of current distributed among the slaves)
Open Modbus Charge Control Interface (OMCCI)	Holding	633	DLM Overall Current available L1	R	1	Overall Current (A) the DLM Master has available to distribute among the slaves
Open Modbus Charge Control Interface (OMCCI)	Holding	634	DLM Overall Current available L2	R	1	Overall Current (A) the DLM Master has available to distribute among the slaves
Open Modbus Charge Control Interface (OMCCI)	Holding	635	DLM Overall Current available L3	R	1	Overall Current (A) the DLM Master has available to distribute among the slaves
Open Modbus Charge Control Interface (OMCCI)	Holding	701	Scheduled Time (hhmmss)	R	2	Scheduled departure time (format is `hhmmss` in big-endian packed BCD with left zero padding) – 15118 only
Open Modbus Charge Control Interface (OMCCI)	Holding	703	Scheduled Date (yymmdd)	R	2	Scheduled departure time (format is `ddmmyy` in big-endian packed BCD with left zero padding) – 15118 only
Open Modbus Charge Control Interface (OMCCI)	Holding	705	(deprecated) Charged Energy	R	1	Sum of charged energy for the current session (Wh)
Open Modbus Charge Control Interface (OMCCI)	Holding	706	Signaled Current	R	1	The maximum current that's being signaled to the EV for charging
Open Modbus Charge Control Interface (OMCCI)	Holding	707	Start Time (hhmmss)	R	2	Start time of charging process
Open Modbus Charge Control Interface (OMCCI)	Holding	709	(deprecated) Charging Duration (seconds)	R	1	Duration since beginning of charge
Open Modbus Charge Control Interface (OMCCI)	Holding	710	End Time (hhmmss)	R	2	End time of charging process
Open Modbus Charge Control Interface (OMCCI)	Holding	712	Minimum current limit	R	1	Minimum current limit for charging
Open Modbus Charge Control Interface (OMCCI)	Holding	713	EV Required Energy (Wh)	R	2	Returns the amount of energy in Wh required by the EV
Open Modbus Charge Control Interface (OMCCI)	Holding	715	Max. Current EV	R	1	This is the maximum current with which the EV can charge
Open Modbus Charge Control Interface (OMCCI)	Holding	716	Charged Energy	R	2	Sum of charged energy for the current session (Wh)
Open Modbus Charge Control Interface (OMCCI)	Holding	718	Charging Duration (seconds)	R	2	Duration since beginning of charge
Open Modbus Charge Control Interface (OMCCI)	Holding	720	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 0 to 3.
Open Modbus Charge Control Interface (OMCCI)	Holding	722	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 4 to 7.
Open Modbus Charge Control Interface (OMCCI)	Holding	724	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 8 to 11.
Open Modbus Charge Control Interface (OMCCI)	Holding	726	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 12 to 15.
Open Modbus Charge Control Interface (OMCCI)	Holding	728	User ID	R	2	User ID (OCPP IdTag) from the current session. Bytes 16 to 19.
Open Modbus Charge Control Interface (OMCCI)	Holding	730	EV Battery State (% 0-100)	R	1	Returns an estimate of the SoC
Open Modbus Charge Control Interface (OMCCI)	Holding	740	15118 Smart vehicle detected	R	1	Returns 1 if an EV currently connected is a smart vehicle, or 0 if no EV connected or it is not a smart vehicle
Open Modbus Charge Control Interface (OMCCI)	Holding	741	EVCCID - 15118 only	R	2	ASCII representation of the Hex. Values corresponding to the EVCCID. Bytes 0 to 3.
Open Modbus Charge Control Interface (OMCCI)	Holding	743	EVCCID - 15118 only	R	2	ASCII representation of the Hex. Values corresponding to the EVCCID. Bytes 4 to 7.
Open Modbus Charge Control Interface (OMCCI)	Holding	745	EVCCID - 15118 only	R	2	ASCII representation of the Hex. Values corresponding to the EVCCID. Bytes 8 to 11.
Open Modbus Charge Control Interface (OMCCI)	Holding	747	Remaining time to full SoC - 15118 only	R	2	Returns the remaining time in seconds to full SoC
Open Modbus Charge Control Interface (OMCCI)	Holding	749	Is in charging loop - 15118 only	R	1	Returns 1 if the EV/EVSE are on a charging loop, 0 otherwise
Open Modbus Charge Control Interface (OMCCI)	Holding	752	Auth. source	R	1	Source of authorization (RFID, Input, Remote, 15118, Autocharge, Freecharge, Power Loss... )
Open Modbus Charge Control Interface (OMCCI)	Holding	1000	Hems Current Limit (A)	R/W	1	Current limit of the HEMS module in Amps
Open Modbus Charge Control Interface (OMCCI)	Holding	1110	User ID	W	2	Write user ID (OCPP IdTag) for the current session. Bytes 0 to 3.
Open Modbus Charge Control Interface (OMCCI)	Holding	1112	User ID	W	2	Write user ID (OCPP IdTag) for the current session. Bytes 4 to 7.
Open Modbus Charge Control Interface (OMCCI)	Holding	1114	User ID	W	2	Write user ID (OCPP IdTag) for the current session. Bytes 8 to 11.
Open Modbus Charge Control Interface (OMCCI)	Holding	1116	User ID	W	2	Write user ID (OCPP IdTag) for the current session. Bytes 12 to 15.
Open Modbus Charge Control Interface (OMCCI)	Holding	1118	User ID	W	2	Write user ID (OCPP IdTag) for the current session. Bytes 16 to 19.