Serial Radio Communication

The serial radio modem is referred to as DCE (Data Communication Equipment) whereas the PC or PLC is
referred to as DTE (Data Terminal Equipment). The 15-pin female ‘D’-type connector of the
radio modem contains the connections required to establish data communication between the serial
radio modem and DTE.
The serial radio modem contains two separate ports, which are designated Port 1 and Port 2.
One and only one of the ports at a time can operate as the DATA port for user data, while the
other port can be used as the NMS port for the diagnostics interface to SATEL NMS PC software.
The user can select which one of the serial ports operates as the DATA port or NMS port by
configuring the radio modem in the Programming Mode or by using the LCD interface.
The physical interface of the serial ports is as follows:
o Port 1 complies always with the RS-232 standard.
o Port 2 can comply either with the RS-232, RS-422 or RS-485 standards (depending on radiomodem).
PLC Communication and SCADA Networks
Terminals are usually PLC devices that send and receive messages according to a specific user protocol. Satel serial radio networks are used worldwide in remote areas where mission critical datacommunication in SCADA networks, such as Energy networks and Watertreatment facilities are required.