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2
DB-9 MALE
3
(RADIO SIDE)
5
COM2 CONNECTIONS
The COM2 connector
external DTE telemetry device that supports the EIA/RS-232 or
EIA/RS-485 (balanced) format, depending on how the radio is config-
ured. The radio supports data rates of 300, 1200, 2400, 4800, 9600,
19200, 38400, 57600, and 115200 bps (asynchronous data only).
The COM2 connector mates with a standard DB-9 plug that is avail-
able from many electronics parts distributors.
vide detailed pin descriptions for the DATA connector in RS/EIA-232
mode and RS/EIA-485 mode, respectively.
5
9
Pin Descriptions—RS/EIA-232 Mode
Table 5
lists the
operate in RS/EIA-232 mode.
The radio is hard-wired as a DCE device in EIA-232 mode.
NOTE:
Table 5. COM2 Pin Descriptions—RS/EIA-232
Pin
Input/
Number
Output
1
OUT
2
OUT
3
IN
4
--
05-4669A01, Rev. A
RXD
<
TXD
GND
Figure 9. COM1 Wiring to Computer
(Figure
1
Figure 10. COM2 Connector (DB-9F)
As viewed from outside the radio
6
connector pin functions when configured to
COM
Pin Description
DCD (Data Carrier Detect)
RXD (Received Data)
Supplies received data to the connected device.
TXD (Transmitted Data)
Accepts TX data from the connected device.
Not Used—Do not connect
Invisible place holder
10) is used to connect the radio to an
Table 5
MDS SD4 Startup Guide
>
RXD
2
DB-9 FEMALE
TXD
3
(COMPUTER)
GND
5
and
Table 6
pro-
13
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