Comtech EF Data SDR-54A - Manual (Page 70)

SDR-54A Satellite Demodulator Revision 4
Specifications MN/SDR54A.IOM
8.6.1 M&C Interface Connector(s)
The M&C interface is an Asynchronous, RS-232 interface on a 9-pin female D-sub
connector.
The connector is located on both the front and back of the rackmount
configuration and on the back of the desktop configuration. The connectors in the
rackmount and desktop configurations are wired in parallel.
Commands can be issued from
either port, but the user must verify that commands will not be issued simultaneously.
Status messages will be sent to both ports simultaneously.
8.6.2 M&C Interface Configuration
The M&C interface is configured for 9600 baud, 7 data bits, 1 parity bit (even), and 2 stop
bits.
8.6.3 M&C Communications
Commands and data are transferred on the M&C communications link as
US ASCII-encoded character strings.
The M&C communications link is operated in a half-duplex mode.
Communications on the remote link are initiated by a remote controller or terminal.
The
receiver never transmits data on the link unless it is commanded to do so.
8.6.4 M&C Message Formats
The message formats for the M&C interface are described in the SDR-54A Installation and
Operation Manual (draft available).
8.7 Monitored Signals
The operator can read one of the following, continually updated, performance monitors:
• Receive signal level
• Raw BER
• Corrected BER
• E
b
/N
0
• Receive frequency offset
8–10