Hi All, I'm trying to get my Arduino w/ an I/O expansion shield to communicate with a WattNode electrical meter via modbus. I'm able to send a packet and the WattNode appears to be accepting it as the light flashes green (this is what the manual says it should do when communications are correct). H…

WattNode and ModBus

system April 2, 2012, 6:50pm 11

Can you post a link to your expansion shield?

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