Appendix A: Troubleshooting
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Appendix A: Troubleshooting
The chart below describes symptoms and solutions if troubleshooting the system or equipment is needed. For further
information, contact Retail Solutions Service at 1-800-829-2724.
SYMPTOM
POSSIBLE PROBLEM
SOLUTION
I/O Network Problems
I/O board not getting power.
Check I/O board power--is the green STATUS light
on? If not, check power wiring connections, and
use a multimeter to verify the board is getting
24VAC.
Reset power to board.
I/O board not communicating
or won’t come online.
Check I/O network connections:
1. Check wire polarity (positive to positive/nega-
tive to negative)
2. Check for broken or loose wires.
Dip switches are set incorrectly.
Check I/O board network dip switches. Verify net-
work ID number is not a duplicate and that baud
rate switches are set to 9600. (If switches are
wrong, make changes and then reset the controller.)
Terminating resistance jump-
ers are set incorrectly.
Check for proper setting of terminating resistance
jumpers. Network segment should be terminated on
the two endpoints of the daisy chain and untermi-
nated everywhere else.
Boards are not powered.
Check Network/Power voltages.
Echelon Network Problems
Faulty wiring.
Check connections. Are wires broken or loose?
Check network polarity (positive to positive/nega-
tive to negative). Check for wire damage.
Termination jumpers are set
incorrectly.
Check for proper setting of terminating resistance
jumpers. Network segment should be terminated on
the two endpoints of the daisy chain and untermi-
nated everywhere else.
Subnet (unit #) is set incor-
rectly.
Each controller must have its own subnet address.
