MGE UPS Systems 250A Manuel D’Utilisation
34020201EN/AB
- Page 15
Q2
Q1
RS-232
RS-485
1
2
3
2. Installation
2.5 Communication connections
1. Connect the communication cable to the
RS232 or RS485 connector on the right-
hand door of the module.
2. Run the cable as shown in the figure
opposite.
3. Tie the cable down to the module frame.
RS232 or RS485 connector on the right-
hand door of the module.
2. Run the cable as shown in the figure
opposite.
3. Tie the cable down to the module frame.
Communication connector details
RS485 connector
2 wires
GND
Tx+
Tx-
Tx-
Tx+ / Rx+
Tx- / Rx-
Tx- / Rx-
RS485 connector
4 wires
GND
Rx+
Rx-
Rx-
Not used
Not used
Not used
Td (from the PMM
display)
Rd (to the PMM display)
display)
Rd (to the PMM display)
GND
RS232 connector
RS-485
RS-232
1
2
3
4
5
6
7
8
9
5
4
3
2
1
Example of an RS485 2-wire
connection:
Example of an RS485 4-wire connection:
Master
Slave
Master or slave
5
4
3
2
1
Tx- / Rx-
Tx+ / Rx+
GND
5
4
3
2
1
Rx-
Rx+
GND
Tx-
Tx+
Rx-
Rx+
GND
Tx-
Tx+
5
4
3
2
1