Rockwell Automation Allen-Bradley 1734-232ASC Original Instructions Manual page 36

Chapter 4 Diagnostics
36
Table 19 - Transmit/Receive Indicators
Indication
Transmit/Receive Status
Flashing transmit/off receive
Flashing receive/off transmit
Off transmit/green receive
Rockwell Automation Publication 1734-UM009C-EN-P - August 2022
Probable Cause
Check wiring, ground, and RX connection. User parameter object to view record
numbers.
Check wiring. Watch TX light. If it does not flash, check that you are properly
initiating transmission. Use EDS parameter object to try transmitting and watch
the light. If it flashes, you are not properly initiating transmission via I/O
messaging. If it does flash, check the remote device.
Check connections as you may have wired the device backwards.