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Reference > Libraries > Arduinomodbus > Modbusserver.coilread

ArduinoModbus - modbusServer.coilRead()

Description

Perform a “Read Coils” operation for the specified address for a single coil.

Syntax

int coilRead(int address);
int coilRead(int id, int address);

Parameters

  • id (slave) - id of target, defaults to 0x00 if not specified
  • address address to use for operation

Returns

coil value on success, -1 on failure.