Comtech EF Data SDR-54A - Manual (Page 25)

SDR-54A Satellite Demodulator Revision 4
External Connectors MN/SDR54A.IOM
3.1.2 Fault Connector (J2)
A fault connection occurs when any of the indicators in the demodulator fault status
command show a fault condition.
Refer to Table 3-3 for Fault connector specifications.
Table 3-3. Fault Connector 9-Pin D Sub Female
Pin # Signal Function Name
1 Ground GND
2 FORM C Normally Closed FCNC
3 FORM C Common FCC
4 FORM C Normally Open FCNO
8 TTL OPEN Collector TTL-OC
Note: A connection between FCNO (pin 4) and FCC (pin 3) indicates no fault.
3.1.3 M&C Port (J3)
The M&C port enables the user to exercise the control and status commands listed in
Appendix A. The port is accessible from either the front or rear panel. Only one of these
ports may be used at a time.
3.1.3.1 Rear Panel Connector Pinout
The M&C port is provided on a 9-pin female D connector. Screw locks are provided for
mechanical security of the mating connector. This connector is a DCE interface. Pinouts are
described in Table 3-4:
Table 3-4. Rear Panel Connector Pinouts
Pin # Signal Function Name
2 Receive data output (RS-232-C) RX
3 Transmit data input (RS-232-C) TX
5 Ground GND
*7 Request to send input (RS-232-C) RTS
*8 Clear to send output (RS-232-C) CTS
9 AGC Analog 0 to 5 VDC at 10 mA AGC
*Note: RTS and CTS are internally connected together.
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