Rockwell Automation 1769-L31 CompactLogix Controller Installation Instructions - Manual (Page 15)

1769-L31 CompactLogix Controller 15
Publication 1769-IN069C-EN-P - May 2008
Make RS-232 Connections to the Controller
Connect the 9-pin female end of the serial cable to the serial port of the
controller.
Follow this procedure to connect to the serial port.
1. Determine whether you need an optical isolator.
Channel 0 is fully isolated and does not need a separate isolation
device. Channel 1 is nonisolated. If you connect channel 1 to a device
outside of the system’s enclosure, consider installing an isolator (such
as the 1761-NET-AIC interface converter) between the controller and
device.
WARNING
If you connect or disconnect the serial cable with power applied to this module
or the serial device on the other end of the cable, an electrical arc can occur.
This could cause an explosion in hazardous location installations.
Be sure that power is removed or the area is nonhazardous before proceeding.