Owner manual

CTI Products, Inc. NCB-AY User Guide
Appendix D. Troubleshooting 41
Table D3
If the ACT LED (on local
NCB) . . .
REASON
CORRECTIVE ACTION
Occasionally blinks on, then
off.
Normal operation indicating a message
packet has passed through the router
module of the NCB.
Go to next Table.
Does not illuminate when
“RSVC” button on remote
NCB is pressed.
1. LonWorks Service Pin message from
remote NCB is not reaching the local
NCB.
2. LonWorks Service Pin message from
remote NCB is not passing through the
local router module.
1a. Verify that “ACT” and “ERR” LED’s
on remote NCB flash once. If not,
return remote unit for
evaluation/repair.
b. Verify serial cable connection between
NCB units.
c. If “PORT1” is used, verify that
“BAUD1” switches on both NCB units
are between ‘1’ and ‘7’ and set to the
same position. See “BAUD SWITCHES”
in section “2. SETUP AND OPERATION.
Then press “RESET”.
d. If ‘PORT1’ is used, verify that
‘MODE1’ switches on both NCB units
are set to same position. See “MODE
SWITCHES” in section “2. SETUP AND
OPERATION”. Then press “RESET”.
2a. Place the remote router in Repeater
mode and verify that the local “ACT”
LED illuminates when “RSVC” button
on remote NCB is pressed.
b. If ‘2a’ is ok, re-commission the local
NCB router.
c. If ‘2a’ is not ok, swap either the local
or remote unit with a known-good-unit
to determine the faulty unit.
Does not illuminate when
local LonWorks nodes are
transmitting messages.
1. LonWorks message packets from local
nodes are not passing through the local
router module.
1a. Verify the connection between the
local LonWorks nodes and the local
NCB.
b. Place the local router in Repeater mode
and verify that its “ACT” LED
illuminates when local LonWorks
nodes are transmitting messages.
c. If ‘1b’ is ok, re-Commission the local
NCB.
d. If ‘1b’ is not ok, return the local NCB
unit for evaluation/repair.
Table D3 continued on next page 