14
MDS SD4 Startup Guide
05-4669A01, Rev. B
COM2 CONNECTIONS
The
COM2
connector (
Figure 10
) 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
.
NOTE:
The radio is hard-wired as a DCE device.
Figure 10
.
COM2 Connector (DB-9F)
As viewed from outside the radio
Table 5. COM2 Pin Descriptions—RS/EIA-232
Pin
Number
Input/
Output
Pin Description
1
OUT
DCD (Data Carrier Detect/Link)
—A low indicates
signal received.
Digital Modem Selections: Digital carrier detect
Analog Modem Selections: Squelch indicator
2
OUT
RXD (Received Data)
—Supplies received data to
the connected device.
3
IN
TXD (Transmitted Data)
—Accepts TX data from the
connected device.
5
9
6
1
Summary of Contents for MDS SD4 Series
Page 19: ...Installation Guide ...
