MS-TEC26xx Series Thermostats and Third-Party MS/TP Devices - BCPro - LIT-12011908 - General System Information - BCPro System - 4.0

MS/TP Communications Bus for the BCPro System Technical Bulletin

Product name
BCPro System
Document type
Technical Bulletin
Document number
Revision date

MS-,TEC26xx Series thermostats, and third-party MS/TP devices generate more data traffic in the BCPro system than CH-PC MS/TP devices. Increased data traffic reduces FC bus performance and reduces the number of devices that can be connected to the bus. When any of these devices are connected on an FC bus, different device and cable length limits apply to the bus and bus segments.

If you connect one or more MS- family controller, TEC26xx Series thermostats, and third-party BACnet MS/TP devices on an FC bus, the supported maximum device counts, bus segments, and bus length are as follows:

  • 64 devices total per FC bus (maximum)

  • 3 bus segments per FC bus (maximum)

  • 32 devices per bus segment (maximum, not to exceed 64 devices total on FC bus)

  • 1,220 m (4,000 ft) maximum per bus segment (using 22 AWG stranded, 3-wire twisted, shielded cable)

  • 3,660 m (12,000 ft) maximum per FC bus (using 22 AWG stranded, 3-wire twisted, shielded cable)

Third-party MS/TP devices also have different EOL termination requirements.