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MNB-1000 BACnet MS/TP communications does not auto-baud

Issue

MNB-1000 BACnet MS/TP communications does not auto-baud (synchronize).
 

Environment

I/A Series R2 UNC-520
I/A Series MNB-1000 1.2 and above

Cause

I/A Series MNB controllers with firmware 1.2 and above supports baud rate synchronization (auto-baud) for BACnet MS/TP communications. This auto-baud feature is available if the device is configured for BACnet MS/TP communications only.  If the MNB-1000 BACnet Ethernet (or BACnet IP) communications are enabled, even though this is not being used in normal operation, it will cause the auto-baud to be disabled. 

Resolution

1. Disable the BACnet Ethernet (or BACnet IP) communications on the MNB-1000. Use a compatible RS-232 to RS-485 converter or the Roam IA to access the MNB-1000 via BACnet MS/TP communications.

2. Set the baud rate of the MNB-1000 MS/TP port to a fix speed that matches the configured baud rate of the RS-485 port of the UNC-520.

- Connect to the MNB-1000 using the WorkPlace Commissioning Tool.

- Go to the MNB-1000 device properties, MS/TP tab and set the baud rate of the MNB-1000 MS/TP port. See example below.

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Revision #:
1 of 1
Last update:
‎2018-09-10 11:01 PM
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