Electrical Interfaces
DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
5-4
TM065 – Rev. 3.3
5.3.7 REMOTE (J7)
The Remote Port (J7) is the RS-485 connection for remote monitor and control of the modem. It
is a 9-Pin Female “D” Connector. Refer to Table 5-5 below for the connector pinouts.
Table 5-5. RS-485 Remote Port – 9-Pin Female “D” Connector (J7)
Pin Number
Signal
Description
Direction
1
RS-485 TxD-B
Transmit Data B
Output
5
GND
Ground
–
6
RS-485 TxD-A
Transmit Data A
Output
8
RS-485 RxD-B
Receive Data B
Input
9
RS-485 RxD-A
Receive Data A
Input
5.2.9 DATA INTERFACE (J9)
The Data Interface Port (J9) is used for Synchronous Data Interface and allows the use of
RS-422, RS-232, and V.35 Interfaces. It is a 37-Pin Female Connector. Refer to Table 5-6 for
RS-422 connector pinouts, and Tables 5-7 and 5-8 for RS-232 and V.35 adapters.
Table 5-6. Sync Data - 37-Pin Female Connector (J9)
Pin Number
Signal
Description
Direction
4
SD-A
Send Data A (-)
Input
22
SD-B
Send Data B (+)
Input
5
ST-A
Send Timing A (-)
Output
23
ST-B
Send Timing B (+)
Output
6
RD-A
Receive Data A (-)
Output
24
RD-B
Receive Data B (+)
Output
7
RS-A
Request to Send A (-)
Input
25
RS-B
Request to Send B (+)
Input
8
RT-A
Receive Timing A (-)
Output
26
RT-B
Receive Timing B (+)
Output
9
CS-A
Clear to Send A (-)
Output
14
MF
Mod Fault - Open Collector
Output
33
DF
Demod Fault - Open Collector
Output
27
CS-B
Clear to Send B (+)
Output
11*
DM-A
Data Mode A (-)
Output
29*
DM-B
Data Mode B (+)
Output
13
RR-A
Receiver Ready A (-)
Output
31
RR-B
Receiver Ready B (+)
Output
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