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MDS 05-3438A01, Rev. F
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Data Interface Connector—J3
The data connector on the radio's rear panel is the main system data
interface. It typically connects to the host computer. Refer to
and
Table 5 on Page 23
for pinout details. Refer to
for information on connecting the radio to a VOX assembly.
Figure 21. Data Interface Connector, J3
Table 5. Data Interface Pinout
Pin
Input/Output
Number
1
—
2
IN
3
OUT
4
IN
5
OUT
6
OUT
7
--
8
OUT
9
--
10
--
11
OUT
12
--
13
--
14
--
15
OUT
16
--
17
--
MDS 4790/9790 Series I/O Guide
Figure 22 on Page 24
Invisible place holder
13
1
25
14
Pin Description
Shield Connection. Connects to ground (negative
supply potential) on the radio's PC board.
TXD—Transmitted Data. Accepts TX data from the
connected device.
RXD—Received Data. Sends received data to the
connected device.
RTS—Request-to-Send Input. Keys the
transmitter when RTS is asserted.
CTS—Clear-to-Send Output. Active after the
programmed CTS delay time has elapsed.
DSR—Data Set Ready. Provides a +6 Vdc DSR
signal through a 2.5 kΩ resistor.
Signal Ground. Connects to ground (negative
supply potential) at the radio's PC board.
DCD—Data Carrier Detect. Activates when the
radio detects an on-frequency signal.
No Connection
No Connection
Receive Audio Monitoring Connection (used for
diagnostics). Drives high-impedance load.
No Connection
No Connection
No Connection
Do not connect—Reserved for future use.
No Connection
Do not connect—Reserved for future use.
Figure 21
23
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