Communications - Bacnet Ms/Tp; Wiring Illustration - Johnson Controls FMS-1655 Series Installation Manual

NOTE: For optimum network communications, the reference signal (REF)
must be connected to the "BMS NETWK REF" terminals at the backplane.
To minimize offline conditions on Metasys trunks resulting from delayed
responses from the BACnet controller, the NETWORK TOLERANCE
parameter in Metasys should be set to HIGH.
Controller Configuration Dipswitch Settings
S3 - 7 = ON, S3 - 8 = ON (BACnet MS/TP protocol selected)
COMMUNICATIONS - BACnet
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MS/TP
®
Wiring