Communications wiring
Fan Coil CARRIER CORPORATION ©2020
Integration Guide All rights reserved
17
Troubleshooting LonWorks communication
The most common communication problems result from not properly following the configuration steps outlined
above in this manual. Review all of the steps and use the following list to check your settings.
Verify accuracy of the following:
Hardware settings for LonWorks (8 Data bits, No Parity, and 1 Stop bit):
• Baud rate DIP switches 1 and 2 set to 38.4 kbps
• LonWorks protocol DIP switches 3 and 4
• Jumper set to EIA-485 when using the LonWorks Option Card
• LON network terminated on LonWorks Option Card pins 1 and 2
NOTES
• If RX LED is solid, then the terminations are incorrect.
• If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.
• If a controller begins or ends a network segment, a terminating resistor may be needed.
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