B
Hi,
I am doing a masters project on WirelessHART control. The gateway that I am using has a modbus TCP, modbus RTU, and HART multidrop output.
When I try to poll input registers, through Modbus, all I get back are fixed values. The input registers are mapped to all the devices on the WirelessHART network, I have particular interest in the primary variable of a temperature sensor, which should be changing but appears fixed through modbus.
I have no experience with modbus outside this project so I am not sure if I am doing something wrong. I have used simplymodbus, modbus32 and a Modbus to profibus converter to interagate the data that I am getting.
I suspect there might be a problem with the modbus side of the gateway, as software has been provided for monitoring the process which works fine through HART multi-drop.
I have all the communications parameters( baud rates, stop bits, etc.) configured on both the pc and gatewat end; though if it weren't set up right I would imagine that I would be getting no response at all. I have tried this on Modbus RTU and TCP with the same result
Anyone have any idea what the problem might be?
Thanks,
Barry
I am doing a masters project on WirelessHART control. The gateway that I am using has a modbus TCP, modbus RTU, and HART multidrop output.
When I try to poll input registers, through Modbus, all I get back are fixed values. The input registers are mapped to all the devices on the WirelessHART network, I have particular interest in the primary variable of a temperature sensor, which should be changing but appears fixed through modbus.
I have no experience with modbus outside this project so I am not sure if I am doing something wrong. I have used simplymodbus, modbus32 and a Modbus to profibus converter to interagate the data that I am getting.
I suspect there might be a problem with the modbus side of the gateway, as software has been provided for monitoring the process which works fine through HART multi-drop.
I have all the communications parameters( baud rates, stop bits, etc.) configured on both the pc and gatewat end; though if it weren't set up right I would imagine that I would be getting no response at all. I have tried this on Modbus RTU and TCP with the same result
Anyone have any idea what the problem might be?
Thanks,
Barry