External control RS485
External control RS485
This section provides an overview of the Modbus RTU interface supported by TeltoCharge electric vehicle supply equipment (EVSE). The document provides description of the available Modbus registers for the external control and communication with the charger based on a wired RS485 connection. This functionality is only available when the charger is configured as a secondary (server) device and waits for acceptable commands from the primary (client) device. The secondary device can operate on two modes:
- It can be configured to use a watchdog for communication and if no valid communication is present after a configurable time interval, the charging (if ongoing) will stop and EVSE will not perform any charging until valid communication is reestablished;
- the EVSE does not use a watchdog and continuous communication is not needed. As it is possible to change the EVSE settings by using the TeltoCharge mobile application, it is recommended for the primary device to read, compare, and change settings as needed based on user preferences and real-time requirements, ensuring a seamless and secure charging experience for electric vehicle owners. Continuous monitoring and adjustment of EVSE settings enable the primary device to stay synchronized with user inputs, maintain optimal charging conditions, and promptly respond to any changes initiated through the TeltoCharge mobile application, thereby enhancing overall efficiency and user satisfaction.
Device preparation
TeltoCharge must be configured as a secondary device via a TeltoCharge mobile application and device must have RS485 wired connection with the primary device..
- Open "User menu"
- Open "Installer menu"
- Open "Load Managment"
- Select "Secondary"
- Enable secondary device
- Check if the address is expected in your system
Modbus Register Map
| Address | Type | Name | Format | Values | Default value | Unit | Comment |
|---|---|---|---|---|---|---|---|
| 0 | R | Voltage L1 | int16 | -32768 - 32767 | - | V | Input voltage on L1 |
| 1 | R | Voltage L2 | int16 | -32768 - 32767 | - | V | Input voltage on L2 |
| 2 | R | Voltage L3 | int16 | -32768 - 32767 | - | V | Input voltage on L2 |
| 3 | R | Current L1 | int16 | -32768 - 32767 | - | *10 A | Current on L1 |
| 4 | R | Current L2 | int16 | -32768 - 32767 | - | *10 A | Current on L2 |
| 5 | R | Current L3 | int16 | -32768 - 32767 | - | *10 A | Current on L3 |
| 6 | R | EVSE status | uint16 | 0-9 | - | - | Evse state in DLM (see a below) |
| 7 | R | EVSE status time 1st word | -32768 - 32767 | - | s | Evse status time, first word (uint16_t) | |
| 8 | R | EVSE status time 2nd word | -32768 - 32767 | - | s | Evse status time, second word (uint16_t) >> 16 | |
| 9 | R | EVSE ID | uint16 | 21571 | 21571("TC") | - | Teltocharge ID |
| 10 | R | EVSE 3ph config | uint16 | 0-1 | - | - | 0 - not possible, 1 - possible |
| 11 | R | Phase change | uint16 | 0-1 | - | - | 0 - not possible, 1 - possible |
| 12 | R | Amp limit | uint16 | 0,6-32 | - | A | Max amps the EVSE can supply |
| 13 | R | Phase connected | uint16 | 0-6 | - | - | 0 - L1,
1 - L2, 2 - L3, 3 - L1/L2, 4 - L1/L3, 5 - L2/L3, 6 - 3ph 7 - none |
| 14 | R/W | Phase to use | uint16 | 0-7 | - | - | Sets which phase to use for slave,
0 - L1, 1 - L2, 2 - L3, 3 - L1/L2, 4 - L1/L3, 5 - L2/L3, 6 - 3ph, 7 - none |
| 15 | R/W | Amps to use | uint16 | 0, 6-32 | - | A | Sets max allowed from primary to secondary |
| 16 | R/W | Request stop charging | uint16 | 0-1 | - | - | Request stop charging |
| 17 | R/W | Request authorize | uint16 | 0-1 | - | - | Request authorization |
| 18 | R/W | Lock/unlock socket | uint16 | 0-2 | 0 | - | 0 - auto lock,
1 - always lock, 2 - force unlock in auto mode (resets on state A) |
| 19 | R/W | Communication timeout | uint16 | 0-600 | 30 | s | Defines communication watchdog (0 - no req for periodic comm) |
| 20 | R/W | Failsafe current | uint16 | 0, 6-32 | 6 | A | Defines max allowed current on comm timeout |
| 21 | R/W | Request reboot | uint16 | 0-1 | 0 | - | Request reboot |
| 22 | R | Require authorization | uint16 | 0-1 | - | - | Defines requirement for authorization |
| 23 | R | Product code | uint16 | 0-9999 | 1234 | - | Product code EVCxxxx |
| 24 | R | Serial number 1st word | 0-65535 | 123456789 | s | Serial number, first word (uint16_t) | |
| 25 | R | Serial number 2nd word | 0-65535 | s | Serial number, second word (uint16_t) >> 16 | ||
| 26 | R | FW version | uint16 | 11200-29999 | - | - | FW version |
| 27 | R | Charge point state | uint16 | 0-9 | - | - | Defines charge point state (see b below) |
| 28 | R | Max power from grid | uint16 | 6-1000 | 30 | - | Defines max power from grid |
| 29 | R | User settable max current | uint16 | 6-32 | 10 | - | Defines max settable current by user |
| 30 | R | Lock status | uint16 | 0-1 | - | - | 0 - unlocked,
1 - locked |
| 31 | R | Internal temperature | int16 | -400 - +1250 | - | *10°C | Device's temperature |
| 32 | R | OCPP connected | uint16 | 0-1 | - | - | 0 - off,
1 - on |
| 33 | R | IEC state | uint16 | 0-8 | - | - | IEC state (see c below) |
| 34 | R | Warning code | uint16 | 0-65535 | - | - | Warning code with bit positions (see d below) |
| 35 | R | Error code | uint16 | 0-65535 | - | - | Error code with bit positions (see e below) |
| 36 | R | Current limit cause | uint16 | 0-8 | - | - | Cause of current limit (see f below) |
| 37 | R | Max supported power | uint16 | 0-2 | - | - | 0 - 7.4 kW (1ph 32 A),
1 - 11 kW (3ph 16 A), 2 - 22 kW (3ph 32 A) |
| 38 | R | Instant active power | uint16 | 0-65535 | - | W | Instant power |
| 39 | R | Energy delivered | uint16 | 0-65535 | - | *100kWh | Total supplied active power per session |
| 40 | R | Session duration | uint16 | 0-65535 | - | s | Session duration |
| 41 | R | Total kWh supplied 1st word | uint64 | 0-65535 | - | *100kWh | Total supplied active power in a lifetime (uint16_t) |
| 42 | R | Total kWh supplied 2nd word | 0-65535 | - | *100kWh | Total supplied active power in a lifetime (uint16_t) >> 16 | |
| 43 | R | Total kWh supplied 3rd word | 0-65535 | - | *100kWh | Total supplied active power in a lifetime (uint16_t) >> 32 | |
| 44 | R | Total kWh supplied 4th word | 0-65535 | - | *100kWh | Total supplied active power in a lifetime (uint16_t) >> 48 |