ModBus only write register - datapoint
My customer has device with holding register with "WriteOnly" flag. I can write value into this register, but reading from this register cannot be applied - "Illegal address error".
I wish small checkbox for "exclude" datapoint from periodically reading process.
Sorry for my English.
I've the same problem with a genset controller, and i've found a walk around:
- Create a new data source for your modbus slave with just one point (the write only register) and without slave monitor points.
- Disable point read exception alarms
- Use an update period of 9999999 hours (it'll bother just at first update, never alarm again 'cause next update will be at 10 years ;))
You need to create a new data source because you need to receive point read exception alarms from all the other read and read/write points on your modbus slave.
Attachment: download link
Yes, I already use this workaround, but I wish .... :lol:
This has been added to Mango M2M2, currently in alpha.
Thank you M2MSanta :)