LED indications

PWR LED indicates mains supply.

Table 1. Green PWR LED

Mode	Description	Visual
Permanently on	Mains power connected
Permanently off	No mains power connected

ERR LED indicates M-Bus 2-wire bus status.

Table 2. Red ERR LED

Mode	Description	Visual
Permanently on	Short circuit of the M-Bus 2-wire bus
Permanently off	Normal mode, Idle
Short flash every second	No M-Bus slaves connected
Flashing for 1 second	M-Bus slave collision

RX LED indicates communication from M-Bus slave to computer.

Table 3. Yellow RX LED

Mode	Description	Visual
On/flashing	M-Bus slave is transmitting data
Off	M-Bus slave is not transmitting data

TX LED indicates communication from computer to M-Bus slaves.

Table 4. Yellow TX LED

Mode	Description	Visual
On/flashing	Computer is transmitting data
Off	Computer is not transmitting data

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