Comtech EF Data CST-5000 - Manual (Page 96)

CST-5000 C-Band Satellite Terminal Theory of Operation
Rev. 9 5–7
5.1.5.3 HPA, PS, U/C, and D/C, J3 DB37-Male
Pin # Name Description
1 12.5V PWR Input power to M&C, 12.5V, 220 mA
20 12.5V PWR Input power to M&C, 12.5V, 220 mA
2 DC LNA PWR Output power to DC, 10V, 100 mA
21 GND M&C ground
3 GND M&C ground
22 FAN TACH Input pulse, 0 to 12V, 9 millisecond period
4 FREQ CNTRL Output, voltage 0 to 10V
23 FAN CNTRL Output, NPN OC Transistor with resistor to 5V
5 SPARE
24 EXT OUTPUT1 Output, digital CMOS level - function TBD
6 EXT INPUT3 Input, digital CMOS - function TBD
25 HPA FLT COM Output, ground connection to relay common
7 HPA FLT NO Input from HPA, contact to COM during normal operation
26 SPARE
8 SPARE
27 HPA THERM Input, 5K thermistor to ground located in HPA
9 HPA LEVEL CON Output, 0 to 4 VDC for AGC control of HPA output
28 HPA SHUTDOWN Output, NPN OC transistor to GND, low produces shut-off
10 HPA PWR MON Input from HPA, 0 to 4V
29 SPARE
11 SPARE
30 SPARE
12 DC LEVEL CON Output, analog voltage 0 to 4V, AGC control of D/C output
31 DC LEVEL MON Input, 0 to 4V
13 DC THERM Input, 5K thermistor to ground located in D/C
32 SPARE
14 HPA SDA Bi-directional serial data
33 DC SDA Bi-directional serial data
15 UC SDA Bi-directional serial data
34 HPA SCL Output, serial clock
16 DC SCL Output, serial clock
35 UC SCL Output, serial clock
17 SPARE
36 UC LEVEL MON Input, 0 to 4V
18 UC THERM Input, 5K thermistor to ground located in U/C
37 UC ATT (FLC) Output, analog voltage 0 to 4V, attenuator control
19 UC AGC (CLC) Output, analog voltage 0 to 4V, AGC control