Description of Parts
Beijer Electronics, MAEN953B
13
3.5 Configuration of COM4
The default setting of the COM4 port is RS232, but it can be also be configured
as RS485 or AUX using jumpers.
When configured as RS485, the pins are assigned at half-duplex according to be-
low:
Jumper positions
Description
1-3, 2-4, 7-9, 8-10 On
RS232 (default setting)
3-5, 4-6, 7-9, 8-10 On
RS485
9-11 (12 V), 10-12 (5 V) On
Auxiliary power
Pin number
Description
Pin 1
RX/TX+
Pin 2
RX/TX-
Pin 5
Ground
Pin 9 (optional) +5 V (auxiliary power supply)
12
11
2
1
