Comtech EF Data DD2401 - Manual (Page 70)

Electrical Interfaces DD2401 Satellite Demodulator
5- 2 MN-DD2401 - Rev. G
5.2 Terrestrial Data & Terminal Control Interface (J1)
The J1 Interface supports RS-422 synchrounous Terrestrial Data and RS-232 Remote Terminal
Communications. It is a Female 25-Pin D-Sub Connector. Refer to Table 5-1 for connector
pinouts and Section 4.2 terminal setup and menu descriptions.
Radyne supplies an interfacing Y cables that standardize the terrestrial interface to RS-530 or
RS-449 connection. The Y cable includes a DB 9 connector for Terminal communications that
allows the user to connect to a computer or terminal interface.
• RS530 Y cable is CAR5941
• RS449 Y cable is CA/4263
Table 5-1A. Terrestrial Data Interface Port (J1) - 25-Pin ‘D’ Female
Pin No. Signal Name Description Direction
1 Shield ---
3 RXD-A Receive Data Output
6 DSR Data Set Ready (Always True) Output
7 GND ---
8 CD-A Demod is Phase Locked Output
9 RXC-B Receive Clock Output
10 CD-B Demod is Phase Locked Output
16 RXD-B Receive Data Output
17 RXC-A Receive Clock Output
Table 5-1B. Terminal Interface Port (J1) - 25-Pin ‘D’ Female
Pin No. Signal Name Description Direction
18 TX-232 RS-232 (Terminal) Input
20 Unused ---
21 RX-232 RS-232 (Terminal) Output
22 Unused ---
23 GND ---
25 Unused ---
5.3 EXT REF
The External Reference Input (J2) is supplied to allow the customer to phase-lock the
demodulator’s internal oscillator to an external reference. All internally generated frequencies
within the modem will attain the stability of the applied external reference.
This female BNC Connector accepts a 1.5 – 5 Vp-
p @ 50Ω. The frequency range of the external
reference is 1 – 10 MHz in 8 kHz steps.