User's Manual

SELEX Communications
Information contained in this document may not be used, applied or reproduced for any purpose unless agreed
by SELEX Communications S.p.A. in writing
41
July 2010
RS232
RS232 standards are defined by EIA/TIA (Electronic Industries Alliance /Telecommunications Industry
Association). RS232 defines both the physical and electrical characteristics of the interface. RS232 is
an Active LOW voltage driven interface and operates at +12V to -12V. RS232 is a serial interface for
the transmission of point to point digital data. Description of the connector’s pins is from DTE to DCE.
The RBS acts as a DCE.
RS232 female pinout
PIN
Mean
1 not used
2 RX Data from DCE to DTE
3 TX Data from DTE to DCE
4 not used
5 GND Ground
6 not used
7 RTS Ready To Send (from DTE)
8 CTS Clear To Send (to DTE)
9 not used
RS422
RS422 is a balanced serial interface for the transmission of point to point digital data. The advantage
of a balanced signal is the greater immunity to noise. The EIA describes RS422 as a DTE to DCE
interface for point-to-point connections. Description of the connector’s pins is from DTE to DCE. The
RBS acts as a DCE.
RS422 female pinout (only on request)
PIN
Mean
1 GND Ground
2 TX + Data from DTE to DCE
3 not used
4 RX + Data from DCE to DTE
5 GND Ground
6 not used
7 TX - Data from DTE to DCE
8 not used
9 RX - Data from DCE to DTE