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Electrical Interfaces
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
5.3 DMD2401 LB/ST with RS-422/V.35/RS-232/Asynchronous Data Interface
The DMD2401 LB/ST with RS-422/V.35/RS-232/Asynchronous Data Interface is shown in
Figure 5-2.
Figure 5-2. DMD2401 LB/ST with RS-422/V.35/RS-232/Asynchronous Data Interface
5.3.1 RX DC POWER (J1)
The Receive DC Power Port (J1) is the 950 – 1750 MHz Demodulator IF Input. It may be a Mini
UHF (shown) or SMA Connector depending upon customer request.
5.3.2 TX DC POWER (J2)
The Transmit DC Power Port (J2) is the 950 – 1750 MHz Modulator IF Output. It may be a Mini
UHF (shown) or SMA Connector depending upon customer request.
5.3.3 TERMINAL (J3)
The Terminal Port (J3) pinouts are listed in Table 5-2.
5.3.4 REMOTE (J4)
The Remote Port (J4) is the RS-485 connection for remote monitor and control of the modem. It
is a 9-Pin Female "D" Connector. Refer to Table 5-3 for the connector pinouts.
5.3.5 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:
The pin definitions for J5 are shown in Table 5-5.
Note: The NC and NO (Normally Closed and Normally Open) nomenclature applies to
non-energized relays.
5-8
TM075 – Rev. 1.3
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