Alarm (J5) - Radyne DMD2401 LB Installation And Operation Manual

DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
Table 5-3. RS-485 Remote Port – 9-Pin Female "D" Connector (J4)
Pin Number
1 RS-485 TxD-B
5 GND
6 RS-485 TxD-A
8 RS-485 RxD-B
9 RS-485 RxD-A

5.2.5 ALARM (J5)

The modem has two Form-C Dry Contact Alarm Relays onboard and an Alarm Connector
located on the rear panel, the 9-pin male "D" sub connector (J5).
The two relays are designated Modulator Alarm and Demodulator Alarm. Non-Alarm is defined
as the powered state of the relay. Thus, if there is a Modulator Alarm and/or Demodulator
Alarm, the pins will be connected as shown in Table 5-4:
Pins 2 and 3 Shorted
Modulator
Pins 8 and 9 Shorted
Demodulator
The pin definitions for J5 are shown in Table 5-5 below.
Note: The NC and NO (Normally Closed and Normally Open) nomenclature applies to
non-energized relays.
Table 5-5. Alarm Connector Pin Assignment (J5)
Pin Number
1 Mod Alarm Relay A NO on Alarm
2 Mod Alarm Relay A Common
3 Mod Alarm Relay A NC on Alarm
4
5 AGC Voltage Output
6 GND
7 Demod Alarm Relay B NO on Alarm
8 Demod Alarm Relay B Common
9 Demod Alarm Relay B NC on Alarm
TM075 - Rev. 1.3
Signal
Transmit Data B
Ground
Transmit Data A
Receive Data B
Receive Data A
Table 5-4. Alarm Relays
Alarm
Pins 1 and 2 Shorted
Pin 7 and 8 Shorted
Connection
Description
No Alarm
Electrical Interfaces
Direction
Output
–
Output
Input
Input
5-3