Communications wiring
Fan Coil CARRIER CORPORATION ©2020
Integration Guide All rights reserved
14
Troubleshooting N2 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 N2 (8 Data bits, No Parity, and 1 Stop bit):
• Baud rate DIP switches 1 and 2 set to 9600 bps
• Protocol DIP switches 3 and 4
• Jumper set to EIA-485
• Proper connection wiring
• Unique rotary address switches 1 – 99. If controllers have duplicate addresses, network communication can
be lost.
• Unique BACnet Device Instance numbers. Default is 16101XX, with the rotary address switches defining XX. If
controllers have duplicate device instance numbers, network communication can be lost.
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.
• The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.
• Refer to Appendix A for the Network Points list.
• Refer to Appendix D for the Protocol Implementation Conformance Statement.
Software settings defined through the Equipment Touch device. To confirm settings, obtain a Modstat of the
device. On the Equipment Touch, click the link to the Modstat.
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