RC-1170/1270 Redundancy Switch Controllers
Revision 0
Installation and Connectors
2–5
MN-RC-1170/1270
J1, Control and Bias
The LNA/LNB J1 connector is a 25-pin D socket and can mate with any 25-pin miniature
D connector plug. See Table 2-2 for connector pinouts.
Table 2-2. ‘J1’
Controller LNA/LNB Output Connector
Pin #
Name
Description
Notes
12
LNA 1 +14 VDC
Output power for LNA/LNB 1
selectable 12/18 V
25
LNA 1 RETURN
Ground
Same
10
LNA 2 +14 VDC
Output power for LNA/LNB 2
selectable 12/18 V
23
LNA 2 RETURN
Ground
Same
8
BACK UP +14 VDC Output power for backup LNA/LNB.
selectable 12/18 V
21
BACK UP RETURN Ground.
5
1 ONLINE CMD
Places LNA/LNB 1 online, 48 VDC pulse for 400 ms
4
2 ONLINE CMD
Places LNA/LNB 2 online, 48 VDC pulse for 400 ms
3
BACKUP 1 CMD
Places BU on 1, 48 VDC pulse for 400 ms.
2
BACKUP 2 CMD
Places BU on 2, 48 VDC pulse for 400 ms.
1
WG SW COM
Ties to common of all coils. When coil is pulsed, it becomes
the return.
6
WG SW IND 1 OL Indicator contact from associated waveguide switch
19
WG SW IND 2 OL Indicator contact from associated WG switch
7
WG SW IND BU OL Indicator contact from associated WG switch
17
WG SW IND COM Logic ground
9
EXT BACKUP FLT Induces BU FLT if tied to GND
11
EXT FAULT 2
Induces Unit 2 FLT if tied to GND
13
EXT FAULT 1
Induces Unit 1 FLT if tied to GND
20
BU STATUS
BU Status, Totem pole TTL driven with series 330 ohm
resistor between device driver and pin appropriate to
directly drive typical LED, High when FAULTED, low when
OK
22
UNIT 2 STATUS
Unit 2 Status, Totem pole TTL driven with series 330 ohm
resistor between device driver and pin appropriate to
directly drive typical LED, High when FAULTED, low when
OK
24
UNIT 1 STATUS
Unit 1 Status, Totem pole TTL driven with series 330 ohm
resistor between device driver and pin appropriate to
directly drive typical LED, High when FAULTED, low when
OK
14
SHIELD GND
Connects shield on cable to chassis ground.
15
Unit Fault NC
Open when Main Unit faulted, tied to GND if OK
16
Unit Fault NO
Open when Main unit OK, tied to GND if faulted
18
Logic GND
Logic Ground