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Figure 3: Modbus config
Figure 4: BACnet MS/TP config
How to troubleshoot: using the UART errors counter, watch to see if the number is increasing rapidly. This is potentially
a sign of duplicate or incorrect addressing. Check the communication setup for MAC address, Station ID, Node address,
Device object ID, Instance ID, etc. If something simple like 0, 1, 127, 254, 4194303 these are likely still at default values.
Be sure to refer to a network or controls address schedule to identify the correct address or any unused, available
addresses. Some supervisory controllers can automatically assign BACnet Device IDs based on the controllers BACnet
Network ID and the device MAC address. Likely this only applies to controllers of the same manufacture as the
supervisor. The programming technician then may not realize they need to manually set the Device object ID for 3
rd
party devices.
When making changes to communications settings, the device may require a reboot (power cycle) to apply the changes.
The ACH580 includes a refresh settings (Parameter 58.06) option to apply changes without requiring a reboot, as shown
in Figure 5.
Figure 5: Select Apply settings to make config changes
Baud Rate, auto or manual
Data transmission rate or baud is usually adjustable in most devices and can be used to improve reliability over longer
distance communication links. Many manufacturers use a default speed for their devices but not everyone uses the
same value. Autodetect is an option to let a device determine baud rate by reading data on the link and setting the Baud
rate configuration parameter (Parameter 58.04). If the link baud rate can be determined, this is preferred to set
manually and eliminate one variable for communication network troubleshooting, see Figure 6.
Figure 6: Autodetect or manual baud rate
How to troubleshoot: while the UART error counter might increase because of data packets errors, the whole
communication link will also be offline as one device transmitting at a difference baud rate will affect all devices.
Confirm the expected link baud rate and adjust in devices accordingly. Note that with Autodetect used as a baud rate
setting, if the link baud rate were to change, the Autodetect would have to be selected again as its previously detected
baud would be written into the configuration parameter. Again, changes to this parameter do require a reboot or
refresh/apply setting changes to the EFB, see Figure 5.
LVD-EOTKN129U-EN REV A
Effective: 2023-03-31
3
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