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Errata b, Comtech efdata documentation update, Comments – Comtech EF Data SDM-9000 User Manual

Page 6: Change specifics, 10 alarms (j10)

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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