7
CET Electric Technology
Figure 2-4 DIN-Rail Mounting
2.3 RS-485 Wiring
The PMC-1302 ESG provides two RS-485 ports (P2 and P3). Up to 32 devices can be connected on a
RS-485 bus. The overall length of the RS-485 cable connecting all devices should not exceed 1200m.
If the master station does not have a RS-485 communications port, a RS-232/RS-485, USB/RS-485 or
Ethernet/RS-485 converter with optically isolated outputs and surge protection should be used.
The following figure illustrates the RS-485 communications connections on the PMC-1302 ESG:
Figure 2-5 RS485 Communications Connections
2.4 Ethernet Port (10/100BaseT)
The PMC-1302 ESG comes standard with an Ethernet Port (P1) using the MDI/MIDX Auto-detect RJ45
connector which means users can connect with a straight-through cable or an Ethernet cross-over
cable. The table below lists the meaning for each pin.
RJ45 Connector
Pin
Meaning
1
Transmit Data+
2
Transmit Data-
3
Receive Data+
4,5,7,8
NC
6
Receive Data-
Table 2-1 RJ45 Connector Pin Description for 10/100BaseT Applications
2.5 Power Supply Wiring
For AC supply, connect the live wire to the L/+ terminal and the neutral wire to the N/- terminal.
Figure 2-6 Power Supply Connections
