TCI-R Comm3/4 Communications Troubleshooting
Summary:
If you are experiencing communication issues with your Reliatel TCI-R Comm3/4 system, here are some troubleshooting steps you can take. Remember to always follow the manufacturer's recommendations and guidelines provided in the product documentation for troubleshooting and support
Some things to try on ReliaTel RTU's:
Check the Dipswitch settings on TCI board. ReliaTel TCI 3/4 module uses same addressing scheme as the TCI on older UCP controlled Voyager except for Dipswitch 1 (DIP 1 selected high temp input on TCI-3 for older UCP Voyager is not present on the ReliaTel TCI-R).
For CCP II, all TCI DIP switches are ON. For CCP III, all DIP switched are OFF. Also verify that daughter board is in the 'Non-Isolated Comm3 or Comm4' Position.
Check Polarity of the Comm4 link (the terminal located closest to the Dipswitch is positive).
An ECA module failure occasionally disrupts ReliaTel communications. Pull the 4-wire plug OFF at the economizer module and cycle power to the RTU.
Note: If available, use Rover Comm4 service tool to find a TCI-3 on an older UCP Voyager RTU's. Rover DOES NOT see a TCI-R on a ReliaTel controlled RTU.
Check the TX and RX LEDs on a TCI 3/4. When communicating correctly, the RX flashes quickly and often; The TX flashes intermittently, perhaps every 510 seconds.
The System LED should be on solid. If blinking, a problem exists on the Modbus communications link of the unit.
Check the Modbus TX and RX on RTRM. Both LEDs should be flickering indicating effective comm between the RTRM and other modules including the TCI.
(there is a chip dead center on the board with a version number) and the TCI version (this is on a chip concealed under the Daughter board).
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.