This module provides a basic Modbus client for reading from and writing to various ModBus slaves using RTU or ASCII modes. If you have a serial device (that uses RS-232 or RS-485), this module will work for you. It also supports the notion of a ether-to-serial converter, like the Lantronix or Digi devices. Note that this module does NOT support TCP/Modbus (see Protocol::Modbus for a more complex but more complete interface).