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Reference > Libraries > Arduinomodbus > Modbusserver.holdingregisterread

ArduinoModbus - modbusServer.holdingRegisterRead()

Description

Perform a “Read Holding Registers” operation for a single holding register.

Syntax

long holdingRegisterRead(int address);
long holdingRegisterRead(int id, int address);

Parameters

  • id (slave) - id of target, defaults to 0x00 if not specified
  • address start address to use for operation
  • holding register value on success, -1 on failure.