7
5.3
FRONT PANEL
ST
– Power LED turns on when power is applied to TWCT22. It also shows the device’s working status:
•
LED ON;
•
LED blink low (0.2s ON, 0.6s OFF) – the device is registered in GSM network;
•
LED blink high (0.4s ON, 0.4s OFF) – the device transmits data via GSM network.
ERR
– Error LED turns on when the device has faulty working conditions.
RX
– Indicate the receiving data to the device via serial port.
TX
– Indicate the sending data from the device via serial port.
DIN
– Indicate the digital input’s voltage “true” level.
ROUT
– Indicate the relay output status.
RS232
– Standard serial communication port.
4 relay outputs state LED
Serial port connector
2 serial port
state LED
Device
state LED
4 digital inputs LED
Figure 5.3.1
