DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
Electrical Interfaces
TM075 - Rev. 1.3
5-7
Table 5-8. 25-Pin RS-232 Adapter to J9
V.35 37-Pin
Connector
Signal
37-Pin
Connector (J9)
Signal
Description
Direction
B
GND
1
GND
Signal Ground
---
C
RTS
7
RS-A
Request to Send A
(-)
Input
D
CTS
9
CS-A
Clear to Send A
(-)
Output
E
DSR
11
DM-A (DSR)
Data Mode A (-)
Output
F
RR
13
RR-A (RLSD) Receive Ready A
(-)
Output
P
SD-A
4
SD-A
Send Data A
(-)
Input
S
SD-B
22
SD-B
Send Data B
(+)
Output
R
RD-A
6
RD-A
Recieve Data A
(-)
Input
T
RD-B
24
RD-B
Receive Data B
(+)
Output
U
TT-A
17
TT-A
Terminal Timing A
(-)
Output
W
TT-B
35
TT-B
Terminal Timing B
(+)
Input
V
RT-A
8
RT-A
Receive Timing A
(-)
Output
X
RT-B
26
RT-B
Receive Timing B
(+)
Input
Y
ST-A
5
ST-A
Send Timing A
(-)
Output
AA
ST-B
23
ST-B
Send Timing B
(+)
Output
5.2.10 TX DC VOLTAGE INDICATOR
The Transmit DC Voltage Indicator shows if there is DC Voltage present at J2.
5.2.11 RX DC VOLTAGE INDICATOR
The Receive DC Voltage Indicator shows if there is DC Voltage present at J1.