Specifications

CI-8 Installation and Operation
P/N 66104700001 Rev. F 2-9
TROUBLESHOOTING
This section provides troubleshooting procedures for the CI-8
If there is poor or no communication between the host system and one or more ACUs, do the
following:
1. Check the 20mA Loop switches. Set a switch to Normal if an ACU is connected to the
corresponding 20mA port. Set to Shunted if there is no ACU connected to the corresponding
20mA port.
2. Check that the correct wire type has been used for the 20mA loop connections. Check for
correct wiring; TX- and TX+ should use one twisted pair, RX- and RX+ should use the other
twisted pair. See Figures 2-5 and 2-6.
3. Check connections from the CI-8 to the ACUs.
4. Check connection between the CI-8 and the power supply or transformer.
5. Check that the baud rates of the host computer and each ACU are the same. Check the port
assignment on the host system. See the appropriate host and ACU manuals.
6. Make sure that a null modem cable is used for all RS-232 connections.
7. Perform a loopback using a known good cable between the host and the CI-8. Place a jumper
between pins 2 and 3 on an RS-232 port. With the host operating in the terminal mode, type
ABC. The character string ABC should loop back and be displayed on the screen if the CI-
8 is operating correctly. If this test fails, contact WSE Customer Support.
8. Check all fuses.
9. Check all components for damage or burn marks.
If the above checks do not resolve the problem, refer to Table 2-1.