Specifications

CI-1 and CI-8 Communications Interface
2-10
Table 2-1: CI-8 Troubleshooting
Symptom Action
Poor or no communication.
Measure the voltage between the CT and AC terminals on the CI-8. If
it is not between 16 and 20 V, replace the power supply. (The 3708
provides 400hz, square wave power which may not be correctly read
by some voltmeters.)
Disconnect the ACU using 20 mA port 1. Measure the voltage between
TX+ and TX- on port 1 of the CI-8. If it is not 24 VDC, go to step 6
below; if it is 24 VDC, go to step 1.
Works with AC but not with battery. Go to step 4 below.
Blows fuses; works with AC. Go to step 5 below.
Works with battery but not with AC. Go to step 6 below.
1. DC present between RX+ and RX- but no communication:
A.. Connect an ACU to one of the RS-232C ports and another ACU to one of the 20 mA ports.
Leave the host system connected. Set the switches, baud rates and port assignments as
required for communication.
B. Check for communication with each of the ACUs.
C. If there is no communication with either RS-232C or 20 mA, go to step 2.
D. If the CI-8 communicates on RS-232C but not on 20 mA, go to step 3.
E. If the CI-8 communicates on 20 mA but not on RS-232C, go to step 6.
2. Set all 20 mA switches to Shunted. Recheck communication on the ACU connected to an
RS-232C port. If it is communicating, go to step 4. If it is not communicating, go to step 6.
3. Check for communication on each of the eight 20 mA ports by connecting an ACU to each
one in turn and selecting only that port. If a port is not communicating, go to step 6.
4. Check the battery voltages which should be a minimum of 12VDC. Go to step 6.
5. Check the battery connections, then check battery voltages (should be less than 13.5 VDC).
Go to step 6.
6. If problem cannot be resolved, contact WSE Customer Support.