MDS 05-4670A01, Rev. E
SD Series Reference Manual (x710 Mode)
15
4.7 COM2 (Data) Connections
The
COM2
port (Figure 14) is used to connect the radio to an external
DTE telemetry device supporting the EIA/RS-232 or EIA/RS-485 (bal-
anced) format, depending on how the radio is configured. Typically, a
straight-through DB-9 cable is used to connect to
COM2
. The radio sup-
ports data rates of 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600,
and 115200 bps (asynchronous data only). The following data formats
are supported:
Table 7 and Table 8 provide detailed pin descriptions for the
COM2
data
port
in RS/EIA-232 mode and RS/EIA-485 mode, respectively.
NOTE:
Make sure the PORT setting from the PORT command matches the
type of interface you are using (RS-232 or RS-485). The default is
RS-232.
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 7 lists the
COM2
port pin functions when configured to operate in
RS/EIA-232 mode.
NOTE:
The radio is hard-wired as a DCE device.
Table 6. Data Formats
Character Bits
Parity
Stop Bits
8
No
1
8
No
2
8
Odd
1
8
Odd
2
8
Even
1
8
Even
2
7
No
1
7
No
2
7
Odd
1
7
Odd
2
7
Even
1
7
Even
2
Figure 14
.
COM2 Connector (DB-9F)
As viewed from outside the radio
5
9
6
1
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