
05-xxxxA01, Rev. 01
MDS SD9 Startup Guide
13
Invisible
place
holder
Figure 8. COM1 Wiring to Computer
NOTE:
To prevent unintended keying of the transmitter during
management activities, set
PTTSIG
to
OFF
, or do not
connect to Pin 6 of the
COM1
port.
COM2 CONNECTIONS
The
COM2
connector (
Figure 9
) is used to connect the radio to an
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.
Table 5
provides
detailed pin descriptions for the
COM2
data connector in RS/EIA-232
mode.
NOTE:
To prevent unintended keying of the transmitter on RTS, set
RTSKEY
to
OFF
, or
do not connect to Pin 7 (RTS) of the
COM2
port.
Pin Descriptions—RS/EIA-232 Mode
Table 5
lists the
COM
connector pin functions when configured to
operate in RS/EIA-232 mode. For RS/EIA-422/485 mode, refer to the
Reference Manual
.
Figure 9
.
COM2 Connector (DB-9F)
As viewed from outside the radio
RXD
TXD
GND
2
3
5
RXD
TXD
GND
2
3
5
>
<
DB-9 FEMALE
(COMPUTER)
DB-9 MALE
(RADIO SIDE)
5
9
6
1
Содержание MDS SD9
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