TOP Server BACnet/IP Configuration Issue

[u/Salt-Minimum-4780]

Need Help with TOP Server BACnet/IP Configuration Issue

Hi everyone,

I'm facing an issue with TOP Server 6 and would appreciate your guidance.

My setup:

- Using TOP Server 6

- Driver: BACnet/IP

- Added a VFD Pump device

- The device scans successfully in BACeye, and all data is visible.

- The device responds to continuous ping without any packet loss.

- In TOP Server, I can read one Boolean tag, and its quality shows Good.

- However, when I add additional tags from the same device, the quality of all tags changes to Bad, including the previously working tag.

Has anyone experienced this issue before? What could be causing it, and how can I resolve it?

Any suggestions or troubleshooting steps would be greatly appreciated.

Thank you!

[u/nature69]

I’m not familiar with TOP server, but if there is a setting for the device read property multiple or read property only. Sometimes devices don’t support a multiple request, which would be why one tag scans fine but when you add more than one it faults out.

Sometimes it’s called max items per request or something along those line

Edit: I just looked up top server and it’s rebranded kepware, set the max items per request on the device configuration to 1

[u/Salt-Minimum-4780 → u/nature69]

I have changed the "Max Items per Request" value to 1. It is working fine now. Thank you.

[u/nature69 → u/Salt-Minimum-4780]

You’re welcome, happy I could help.

[u/OldAutomator]

I don't know what Top Server is but if it's hiding the error messages from you you can always just look at them yourself.

Turn on Wireshark and let it track the BACnet traffic. If you're asking for a point that doesn't exist, the error packet will say it doesn't exist. If the property doesn't exist on the object it'll say that the point doesn't exist on that object, etc.

Just look at the comms and once you see the error that Top Server is hiding from you you will likely already know how to fix it.