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:

1. 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;
2. 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.

1. Open "User menu"
2. Open "Installer menu"
3. Open "Load Managment"
4. Select "Secondary"
5. Enable secondary device
6. Check if the address is expected in your system