Comtech EF Data CRS-400 - Manual (Page 34)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
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2.6.3 S YSTEM A LARMS C ONNECTOR
Located on the System Controller card, the System Alarms connector provides access to
Form-C relay contacts that indicate the fault status of the switch and the summary faults.
If any of the attached mods/demods has any fault active, the corresponding Tx or Rx
summary relay will energize, forcing the normally open pin to connect to (and the
normally closed pin to disconnect from) the common pin.
Another pin provides a ground connection when the audio alarm is sounded so that the
user may add additional audible alarms.
There are also relay contacts to indicate which, if any, of the traffic mods/demods is
currently being backed up. To determine which mod/demod is being backed up (see the
connector pinout, Table 2-2), decode the BCD relay outputs.
Table 2-2 Systems Alarm Connector Pinout, 25-Pin D Type Female
Pin Description
13 Unused Relay – NC Contact
25 Unused Relay – NO Contact
12 Mod/demod Summary Rx Traffic Fault – NC Contact
24 Mod/demod Summary Rx Traffic Fault – NO Contact
11 Mod/demod Summary Tx Traffic Fault – NC Contact
23 Mod/demod Summary Tx Traffic Fault – NO Contact
10 Mod/demod Summary Unit Fault – NC Contact
22 Mod/demod Summary Unit Fault – NO Contact
9 Switch Unit Fault – NC Contact
21 Switch Unit Fault – NO Contact
8 Common contact for pins 9-12 and 21-24
20 Audio Indicator (Gnd = Audio on Float = Audio off)
7 Ground
19 Not Connected
6 BU Mod Replaces Traffic Mod “N”, Bit 1 of 3 – NO Contact
18 BU Mod Replaces Traffic Mod “N”, Bit 2 of 3 – NO Contact
5 BU Mod Replaces Traffic Mod “N”, Bit 3 of 3 – NO Contact
17 Unused Relay – NO Contact
4 BU Demod Replaces Traffic Demod “N”, Bit 1 of 3 – NO Contact