Serial mode is a point-to-point mode of data exchange between two entities. This provides communications between master stations, substation devices, RTUs, and Intelligent Electronic Devices (IEDs). It establishes client/server communication between different modules with a serial link. The master is the client and the slave modules are the servers. The advanced RTU is an asynchronous serial line module that supports RTU serial (master or slave connections).
Serial communication using the RTU module is only possible using the RTU serial protocols:
NOTE: The serial port is also used for the
communication with an external modem. If a modem is connected, it is possible to perform serial RTU communication or Ethernet RTU communication which depends on the type of modem.
