Comtech EF Data CST-5005 - Manual (Page 76)

Theory of Operation CST-5005 C-Band Satellite Terminal
5–6 Rev. 1
5.1.5 M&C Board Connector Pinouts
5.1.5.1 RS-232-C/485 Remote Control (J1)
The remote interface is provided on a 9-pin male D connector. Screw locks are provided
for mechanical security of the mating connector. The remote connector is a Data Circuit
Terminating Equipment (DCE) interface.
Pin # RS-232-C RS-485 Description
1 GND GND Ground
2 TD/TX Transmit Data
3 RD/RX Receive Data
4 +RX/TX Plus Transmit or Receive
5 GND -RX/TX Negative Transmit or Receive
6 DSR Data Set Ready
7 RTS Ready to Send
8 CTS +RX/TX Clear to Send (RS-485 — Plus Transmit or
Receive)
9 -RX/TX Negative Transmit or Receive Data
Notes:
1. Clear to Send (CTS) is tied to Ready to Send (RTS) in RS-232 - C mode.
2. The pinout for Data Terminal Equipment (DTE) interface is provided for
RS-232 - C.
5.1.5.2 Remote Relay Control, J2 DB15-Male
Pin # Name Description
1 EXT PWR Output voltage, 11V, 1A
9 LNA_PWR 10V to LNA
2 DL FLT NO Summary fault relay A
10 DL FLT COM Normal operation, common connects to NO
3 DL FLT NC Fault mode, common connects to NC
11 UL FLT NO Summary fault relay B
4 UL FLT COM Normal operation, common connects to NO
12 UL FLT NC Fault mode, common connects to NC
5 SPARE
13 EXT INPUT 2
6 SPARE
14 LNA_PWR_RTN Ground Return for LNA
7 EXT INPUT1 Input, logic 0 (normal) or 5V (fault)
15 EXT TWT FLT Input, logic 0 or 5V, used for TWT.FLT
8 GND Ground