Reading the baud rate of 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

Attributes in the Metasys system UI display the baud rate settings and current baud rates of devices on the bus.

If the network engine is connected to an MS/TP bus that is already communicating at an unknown baud rate, you can temporarily set the network engine Field Bus Integration object Baud Rate Selection to Auto. You can then read the current baud rate from the Active Baud Rate attribute in the network engine .

To read the baud rates of devices, see the following table.

Table 1. Reading baud rates in the Metasys SMP UI

Device

To read the baud rate setting and the current baud rate

Network Engine

  1. In the Metasys UI, display the Field Bus integration .
  2. Select the Hardware tab, Baud Rate Selection indicates the baud rate selection specified for the network engine .
  3. On the Diagnostics tab, Active Baud Rate displays the current baud rate of the bus.

Field device on the FC Bus

Note: This applies to Johnson Controls equipment controllers. Metasys system TEC Series thermostats and third-party devices may have different means of reporting the baud rate.
  1. In the Metasys system UI, access the Field Bus integration.
  2. On the Engineering Tab, expand the field device object. Double-click the desired MS/TP bus object.
  3. Baud Rate Selection indicates the baud rate selection specified for the field device.

Active Baud Rate displays the current baud rate of the bus.

Note: This Active Baud Rate attribute displays the baud rate at which the device is currently communicating. If the device Baud Rate Selection is set to Auto, you can use this attribute to see what the baud rate actually is.