Siemens MD-BMS - Appendix H - Troubleshooting

Appendices
Appendix H
-
Troubleshooting
104
Building Technologies 125-202
06/06/2017
Appendix H - Troubleshooting
Troubleshooting Communication Issues
When the baud rate on the ViewPoint Communications screen and the MD-BMS or
MD-BMED do not match, communication fails and a Communication Error message
displays in the Status field:
Unable to establish connection with meter, please check settings
and try again.
The following headings provide possible solutions for communication errors. You can
connect using a USB or to get the RS485 back to a known state:
Baud Rate Communications Error (RS-485 Only)
To correct a baud rate communications error:
1. In ViewPoint, set the Modbus Base Address Switches field to 00.
2. On the MD-BMS or MD-BMED, set the address switches to 00.
3. Power up the meter. With both settings at 00, ViewPoint and the MD-BMS or MD-
BMED will communicate at a 9600 baud rate, regardless of a baud rate mismatch.
Communications is established.
4. Select the desired baud rate in ViewPoint from the Baud Rate drop-down list. This
synchronizes the baud rates between ViewPoint and the MD-BMS or MD-BMED.
5. Click Connect in ViewPoint to reconfirm communications.
Port Error
If the PC COM Port drop-down list does not contain an RS-485 port, the RS-485
adapter driver is not installed or the device is not connected to the computer’s USB
port. Check that the adapter is connected to a live USB port, or move the USB cable to
another USB port.
Firmware Update Fails
When the firmware update fails, select a slower baud rate and retry the update.