TEC26xx series thermostats and third-party MS/TP devices - Metasys - LIT-12011034 - General System Information - Metasys System - Release 11.0

MS/TP Communications Bus Technical Bulletin

Brand
Metasys
Product name
Metasys System
Document type
Technical Bulletin
Document number
LIT-12011034
Version
Release 11.0
Revision date
2022-02-07
Language
English

TEC26xx series thermostats and third-party MS/TP devices generate more data traffic than Metasys 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 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.