* The wiring modes 1P2W L-N and 1P2W L-L are not supported by PMC-340A.
Figure 2-6 CT Input connections
2.6 RS-485 Wiring
The PMC-340 provides one standard RS-485 port that supports the Modbus RTU protocol. 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 or USB/RS-485
converter with optically isolated outputs and surge protection should be used. The following figure
illustrates the RS-485 connections on the PMC-340.
Figure 2-7 RS-485 Connections
2.7 Digital Input Wiring
The following figure illustrates the Digital Input connections on the PMC-340:
Figure 2-8 DI Connections
2.8 Pulse Output Wiring
The following figure illustrates the Pulse Output connections on the PMC-340:
Figure 2-9 Energy Pulse Output Connections
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