Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 289)

17–7 Maintenance and Troubleshooting
Publication 2755-833
Problem: Characters do not display or are difficult to read on
the LCD Display.
Cause: Inadequate contrast.
Solution: Improve readability of characters on LCD Display by
adjusting LCD Display potentiometer on main logic board. See
Chapter 9 for details.
Problem: AUX Terminal is set to manual data entry mode, and
terminal is displaying duplicate characters.
Cause: The terminal itself is set to echo data and the Echo to
Terminal configuration parameter is also set to Yes.
Solution: Set the Echo to Terminal parameter to No.
Problem: AUX Terminal is set to manual data entry mode, and
terminal is not displaying any characters.
Cause: Neither the terminal nor the decoder configuration is set
to echo data.
Solution: Set the Echo to Terminal parameter to Yes.
Problem: No communication between decoder and AUX
terminal.
Cause: Incorrect terminal selected from Select CRT Type
screen.
Solution: Select the correct terminal type. See Chapter 5.
Cause: Improperly connected cable.
Solution: Check connections. See Appendix D.
Cause: Improperly fabricated cable.
Solution: Verify connections. See Appendix D.
Cause: Incorrect terminal setup.
Solution: Verify that your terminal is set for 9600 baud, no
parity, 1 stop bit. See Appendix D.
Problem: You cannot access the configuration screens on the
AUX terminal.
Cause: The AUX port is set to manual data entry mode, not
configuration mode.