Modbus Gateways connect a network with serial Modbus lines. They convert Modbus/TCP on the network to Modbus/RTU or Modbus/ASCII on the serial connection. The serial line may operate by RS232 for a single device, or in RS485 mode to connect with many devices. As one extension also RS422 is implemented, replacing RS232 for long distance. And as second extension the ModGate Plus support multiple Modbus Masters on TCP or serial connections. The ModGate Plus with modern RISC-Processor provide Ethernet or WLAN connection plus up to eight serial ports with high speed UART. It is also possible to route protocols from one serial line to another, thereby changing RS232 to RS485, Modbus/RTU to Modbus/ASCII, and serial parameters like bitrate, character size and parity as well.