Modbus RTU Serial Reading Coils failed

I can not get the values of the coils in address (0:65535). The device is a powermeter. I need the value in address 240. The FC1 'Read Coil Status' does not give me any value back.

Using my Modbus CMD Tool, I have to use FC3 'Read Holding Registers'. But because its not ModBusConform, it does not work this way in node-red and shows this error:

Error: Modbus exception 1: Illegal function (device does not support this read/write function)

Thanks for help.

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