CET Electric Technology
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Figure 2-15 1P2W Ull Direct Connection with 1CT
2.6 Communications Wiring
The following figure illustrates the RS485 communications connections on the PMC-53A:
Figure 2-14 Communications Connections
The PMC-53A provides one standard RS485 port and one optional RS485. Up to 32 devices can be
connected on a RS485 bus. The overall length of the RS485 cable connecting all devices should not
exceed 1200m.
If the master station does not have a RS485 communications port, a RS232/RS485, USB/RS485 or
Ethernet/RS485 converter with optically isolated output and surge protection should be used.
2.7 Digital or Pulse Input Wiring
The following figure illustrates the Digital Input connections on the PMC-53A:
Figure 2-16 DI Connections
2.8 Digital (Relay) Output Wiring
The following figures illustrate the Digital (Relay) Output connections on the PMC-53A:
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