Unit installation

Maintenance RSU-503 Redundancy Switch Unit
4–8 Rev. 8
4.5.3 M&C Input/Output Signals (J17)
The M&C I/O connector is a 25-pin male D connector with the following pinouts:
Pin # Name Function
13 DC GND A Tied to signal ground
25 DC GND B Tied to signal ground
12 UL FLT COM A Tied to signal ground
24 UL FLT COM B Tied to signal ground
11 DL FLT COM A Tied to signal ground
23 DL FLT COM B Tied to signal ground
10 Spare
22 UL FLT NO A Input, connected to ground when normal
9 UL FLT NC A Input, connected to ground when faulted
21 UL FLT NO B Input, connected to ground when normal
8 UL FLT NC B Input, connected to ground when faulted
20 Spare
7 DL FLT NO A Input, connected to ground when normal
19 DL FLT NC A Input, connected to ground when faulted
6 DL FLT NO B Input, connected to ground when normal
18 DL FLT NC B Input, connected to ground when faulted
5 Spare
17 Spare
4 SUM FLT NO Output, connected to COM when normal
16 SUM FLT COM Output common
3 SUM FLT NC Output, connected to COM with any fault
15 Spare
2 XVA Input, DC power from unit A (approx. 11V)
14 Spare
1 XVB Input, DC power from unit B (approx. 11V)