LEDs and Error Indication

“PWR” LED is illuminated.

Power supply is connected.

“PWR” LED is flashing and
“ERR” LED is illuminated.

4 Hz

Firmware loader enabled/loading/waiting for upload.

“µSD” LED is flashing.

The memory card is being written.

“TxD/RxD” LED is flashing.

Modbus RTU is enabled.

“DO” LED is illuminated.

DO is enabled.

“PWR” LED and “ERR” LED flash alternately.

Firmware Upload

“ERR” LED is flashing.

2 Hz

Transient state active:
Measured values not yet stable

Transient state ended:
Theshold values exceeded or undershot

“ERR” LED is flashing.

8 Hz

Tamper Detect (fault current detection)

“ERR” LED is illuminated.

Group error message