Hello,
I have followed Modbus serial with Node-RED and was successful upon reading data with the recommended hardware and a real device.
However, every time I try to write to a coil, it always fails. I have set the payload as a buffer and still fails. Has anyone, gotten a write command to work?
Thanks in advance,
Alex
Can you flesh things out a little more for us?
What device are you read/writing to?
What serial port are you using (module or USB)?
What Node-RED nodes are you using?
Are you able to read/write to the device using modscan32?
Thanks.
So you are not a mind reader lol.
Below are some more details…
USB using the Gearmo Model: GM-FTDI-A12
Successful upon reading registers
Using package node-red-contrib-serial-modbus (node-red-contrib-serial-modbus (node) - Node-RED)
Trying to write to the below entry.
I am going to try using modscan32 now.
Ok. I think I understand the problem.
Since the device is not actively collecting data the value is 0 and that coil is used to reset a total. Using modscan32 and viewing the output, I get the exact error message back. I have a feeling when this device goes into the field and collect real data, I will be able to reset that value.
Once this device is installed, I will re-run this exact test and report back.
Thank You.
