We have been using MODBUS TCP over Serial Gateway on loads of RUT956 and it has stopped working since firmware version > RUT9M_R_00.07.13.4
To reproduce this problem, please follow these steps:
- use a RUT956 with firmware version RUT9M_R_00.07.13.4
- configure MODBUS TCP over Serial Gateway: timeout=1 s, Device=rs232, “9600,n,8,1”, Server ID configuration=”User defined”, Server ID=1
- connect a MODBUS device with server ID=1
- use QModMaster to read Holding Registers (0x03) from IP=192.168.1.1, Start Address=1, Number of Registers=2, Unit ID=1 –> it works
- repeat the previous step using Unit ID=2 (same MODBUS device with server ID=1) –> it works
Now, update the firmware version to the late current version RUT9M_R_00.07.20.3_WEBUI.bin and repeat the previous steps:
- QModMaster, Read Holding Registers (0x03) from IP=192.168.1.1, Start Address=1, Number of Registers=2, Unit ID=1 –> it works
- QModMaster, Read Holding Registers (0x03) from IP=192.168.1.1, Start Address=1, Number of Registers=2, Unit ID=2 (same MODBUS device with server ID=1) –> it doesn’t work
Please, follow these steps and let me know if the result is the same.
Thanks in advance.