Hi Peter
This is Max from Milesight-IoT Support
Yes, for the BACnet Server on UG65, this is feasible.
First, please ensure that you have integrated UC100 into the BACnet BMS System as described in the following article. Taking Yabe as an example, you can check the current Modbus channel value as shown below.
How to Integrate LoRaWAN Devices to BACnet BMS System via Milesight Gateway : IoT Support
If you want to write to the end device(Modbus Slave) via BACnet, you need to make the following changes.
1. Please refer to the article linked below to enable the Modbus RS485 Bridge LoRaWAN Feature and set the mode to active Pass-through.
How to use Modbus RS485 Bridge LoRaWAN Feature : IoT Support
2. Configure the port and set the fport of UC100 to the same port.
3. Refer to the Custom Payload Codec in the following link to add the encoder in the attachment to the encoder of UC100 and apply it. This encoder defines the command that the gateway should send when we modify the value of the register pointed by Channel 1 of this UC100 using the Yabe BACnet client. You can modify this code according to your needs.
How to Use Payload Codec on Milesight Gateway : IoT Support
Go to the Yabe directly modify the value of modbus_chn_1. For instance, change 2 to 10. The gateway will then send a downlink command to UC100. Then you can check in the end device whether this modification was successful. Take the Modbus slave as a modbus end device.
Best Regards,
Max Cai | Technical Specialist
Hi,
I am currently facing the same issue as the original poster, followed the steps and still am unable to modify the value via BACnet Server. I am not quite clear about the part about the custom payload codec especially the hex command part, further explanation and clarification would be much appreciated.
Thanks
Lu
Hi Lu,
I solved the issue, to be honest its not so trivial what should be done, writing via UC100 or any LoraWan/RS485 gateway.
What Max advice works, but its needs quite understanding how LoraWan and payloads works. May if you explain the goal what you want to do, i can give you some solutions, i am currently working on many LoraWan project with MileSight and 3rd party lora devices :)
Peter Csorba
Hello,
Is it possible to write to an modbus end device from UG65 bacnet server with using UC100 ?
I managed to read all data configured in UC100 via UG65 bacnet server. But writing to these datapoints simply does not work, its refresh its value on new uplink. Does these datapoints can initaite a downlink? Or writing to the end device is not possibe from bacnet server of UG65?
If not, then what is the solution to write a register from Niagara framework?
Thanks
Peter
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