Rockwell Automation Publication 1769-UM011H-EN-P - April 2012 57
Communicate over Networks Chapter 4
Configure an Isolator
Channel 0 on the CompactLogix controllers is fully isolated and does not need a
separate isolation device. Channel 1 on the 1769-L31 controller is not an isolated
serial port. To configure an isolator, perform this procedure.
1. Determine whether you need an isolator.
If you connect channel 1 of the 1769-L31 controller to a modem or an
ASCII device, consider installing an isolator between the controller and
modem or ASCII device. An isolator is also recommended when
connecting the controller directly to a programming workstation.
One possible isolator is the 1761-NET-AIC interface converter.
Port 2: Mini-DIN 8 RS-232
DC Power Source Selector Switch
Terminals for External 24V DC
Power Supply
Baud Rate Selector Switch
Port 1: DB-9 RS-232, DTE
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