Comtech EF Data SDM-9000 - Manual (Page 6)

Errata B
Comtech EFData Documentation Update
Subject: Changes to Note in Section 2.4.10, Alarms
Date: January 19, 2001
Document: SDM-9000 Satellite Data Modem Installation and Operation
Manual, Rev. 4, dated May 5, 1997
Part Number: MN/SDM9000.EB4
Collating Instructions: Attach this page to page 2-15
Comments:
The following changes provide updated information for page 2-15. This information will be
incorporated into the next revision.
Change Specifics:
2.4.10 Alarms (J10)
The alarms connector is used to provide three Form C contact closures for alarm
reporting, as follows:
• Alarm 1 = Not used
• Alarm 2 = TX
• Alarm 3 = RX
The two Form C summary fault contacts currently used are:
• Transmit alarm (Alarm 2)
• Receive
alarm (Alarm 3)
Refer to Chapter 4 for a discussion of alarms monitored. To obtain a system summary
alarm, connect all the Form C contacts in parallel.
The alarms connection is a 9-pin female D connector located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector.
Pin # Signal Function Name
1 NO
2 Alarm 1 COM
3 NC
4 NO
5 Alarm 2 COM
6 NC
7 NO
8 Alarm 3 COM
9 NC
Note: A connection between the common (COM) and normally closed (NC) contacts
indicates no alarm.
Filename: T_ERRATA
1