Issue
MNB-1000 BACnet MS/TP communications do not auto-baud (synchronize).
Product Line
TAC IA Series
Environment
I/A Series MNB-1000 Firmware 1.2 and above
Cause
I/A Series MNB controllers with firmware 1.2 and above support 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 fixed speed that matches the configured baud rate of the RS-485 port of the Jace.
- 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 the example below.
