User`s manual

100-M0074X1 7 of 24
www.cobham.com/gms
4.1.1 MDT-A Connectors
4.1.1.1 RF Output
The RF Output connector is an SMA female (Bulkhead).
4.1.1.2 I/O
The ‘I/O’ connector is a male, high-density DB-44. It is used to provide the interface for
external power, audio, analog video, USB and RS-232 signals. The MDT-A has a separate
RS232 channel (labeled “Control” on the external breakout cable) for control and
monitoring the unit. GMS MDT Configurator software program (as explained in section 6)
makes use of the RS232 control lines. The RS-232 channel utilizes a 3-wire configuration.
The pin out for the I/O connector is shown in Table 1. NOTE: An additional RS232
channel (labeled “USER DATA”) is currently provided with the external breakout cable
for future update capabilities, which are currently under development. The
“ USER Data” RS232 channel will be dedicated for low-rate data to be transmitted
along with the audio and video.
The USB connector is an alternate method of interfacing to the PC if DB-9 connectors
are not available.
Table 1 - I/O DB-44 Connector Pin Out
Pin Signal Notes
1 RS232 USER Data Tx
Under development
2 RS232 USER Data Rx
Under development
3 RS232 GND
Under development
4 Not connected
5 SDA I^2 C bus
6 SCL I^2 C bus
7 CVBS/Y
Dual use input. 1. Composite video in; 2.
Luminance in (when used with S or Component
Video). Must be selected with GMS Control Software
or through the front panel of the in-line camera
mount box . Not applicable for MDT-A
8 GND GND for composite video
9 C/Pr
Dual use input. 1.Chroma video (when used with S-
video); 2. Pr (red component when used with
Component Video). Must be selected with GMS
Control Software or through the front panel of the in-
line camera mount box. Not applicable for MDT-A
10 GND GND for Chroma video/Pr component Not applicable
for MDT-A
11 Pb Blue component when used with Component Video.
Not applicable for MDT-A
12 GND GND for Pb component Not applicable for MDT-A.
13 GND GND
14 11-15Vdc Input power to unit
15 Not connected
16 USB power, Reset
+5V
17 USB Data -
18 USB Data +