N4IOA01 FAQ

I've a N4IOA01 module that was working fine while i was testing but now it is not responding to Modbus Poll messages anymore.

The LED on the board lights up when powered. When it recives messages it blinks, but it does not send messages.

I've just tried to change the address a few times and set the mA output to a few values and than it stopped responding.
Now it just outputs 20mA constatntly.

Can you give me any advice on how to proceed? Is it worth to change the RS485 transceiver for a new MAX485?

Answer：

Please replace the 16-pin LM324 chip.
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