modbus-connect/constants/constants.js

Modbus RTU over Web Serial and Node.js SerialPort

// constants/constants.js

const FUNCTION_CODES = {
    READ_COILS: 0x01,
    READ_DISCRETE_INPUTS: 0x02,
    READ_HOLDING_REGISTERS: 0x03,
    READ_INPUT_REGISTERS: 0x04,
    WRITE_SINGLE_COIL: 0x05,
    WRITE_SINGLE_REGISTER: 0x06,
    WRITE_MULTIPLE_COILS: 0x0F,
    WRITE_MULTIPLE_REGISTERS: 0x10,
    REPORT_SLAVE_ID: 0x11,
    READ_DEVICE_COMMENT: 0x14,
    WRITE_DEVICE_COMMENT: 0x15,
    READ_DEVICE_IDENTIFICATION: 0x2B,
    READ_FILE_LENGTH: 0x52,
    READ_FILE_CHUNK: 0x5A,
    OPEN_FILE: 0x55,
    CLOSE_FILE: 0x57,
    RESTART_CONTROLLER: 0x5C,
    GET_CONTROLLER_TIME: 0x6E,
    SET_CONTROLLER_TIME: 0x6F
};

const EXCEPTION_CODES = {
  1: 'Illegal Function',
  2: 'Illegal Data Address',
  3: 'Illegal Data Value',
  4: 'Slave Device Failure',
  5: 'Acknowledge',
  6: 'Slave Device Busy',
  8: 'Memory Parity Error',
  10: 'Gateway Path Unavailable',
  11: 'Gateway Target Device Failed to Respond'
};

module.exports = {
  FUNCTION_CODES,
  EXCEPTION_CODES
}