w4tsn/node-red-contrib-modbus-api

Write functionality

Opened this issue · 3 comments

w4tsn commented

This is a basic one not yet implemented because of time constraints. Of course it would be nice if the API-Node could also write/send messages to a server.

Currently as a workaround I recommend using the node-red-contrib-modbus package for write-operations.

gemini86 commented

I've taken a shot at adding the functions setRegister and setCoil. There's still the issue I have of not figuring out how to send a Modbus Exception Code if the client tries to write to unhandled registers. but for the most part I have this fully functioning. Could I send you a PR?

w4tsn commented

Sure, go ahead and send it.

I'll have a look at the Exception Code part, maybe I find something.

gemini86 commented

I've updated the branch in my pull request with added modbus exception codes to handle this issue. Testing shows normal modus error responses when trying to access registers/command combinations that aren't configured with an input node. Even when trying to access them in multi-read/write functions. Hope this is helpful!

  • 🎉1