ModbusSlaveNode: *cbFunc[]()

[Modbus]

Description

cbFunc is a callback function pointer array. When poll() receives the corresponding function code, it will call the corresponding function pointed to in the cbFunc array.

Syntax

uint8_t Func1(function, address, length)
{
return EXCEPTION_CODE;
}
node1.cbFunc[MODBUS_CB_CODES] = Func1;

Parameters

• node1: ModbusSlaveNode object.
• Func1: User-defined function that returns a Byte of EXCEPTION_CODE.
• function: Modbus packet function code.
• address: The address of the bit that the Modbus packet wants to access.
• length: The length of the space that the Modbus packet wants to access.
• cbFunc[]: Call-back function letter array.
• MODBUS_CB_CODES: The callback function has a column index value and supports the following function codes.
  • MODBUS_CB_READ_COILS
  • MODBUS_CB_READ_DISCRETE_INPUTS
  • MODBUS_CB_READ_HOLDING_REGISTERS
  • MODBUS_CB_READ_INPUT_REGISTERS
  • MODBUS_CB_WRITE_SINGLE_COIL
  • MODBUS_CB_WRITE_SINGLE_REGISTER
  • MODBUS_CB_WRITE_MULTIPLE_COILS
  • MODBUS_CB_WRITE_MULTIPLE_REGISTERS
  • MODBUS_CB_MASK_WRITE_REGISTER

Example

Please refer to the Modbus Slave example.

See Also

• ModbusMasterNode::poll()

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