Users Manual

104 MDS™ Master Station MDS 05-6399A01, Rev. G
Table
6
-
6
.
COM1 Pin Descriptions
Pin
Number
Radio Input/
Output
Pin Description
7 OUT
CTS (Clear-to-Send)—Can be used for flow control or
as an output to key another connected radio.
8 IN
RTS (Request-to-Send)—Can be used for flow control
or to key the transmitter.
COM2 Interface
The
COM2 port supports the RS-232 or RS-485 serial data format at serial data rates of 300,
1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 bps (asynchronous only).
Pin Descriptions—RS-232 and RS-485
Pin descriptions for the
COM2 data port in RS-232 mode and RS-485 modes are provided below.
In addition to RS-485 mode, the radio is capable of operating in RS-422 mode. Config-
ure the port for RS-485 but follow the RS-422 wiring arrangements shown in below un-
der COM2 RS-485 and RS-422 Wiring Arrangement.
Figure 6-6. COM2 Connector (RJ-45)
(As viewed from outside the radio)
COM2 is hard-wired as a DCE device.
Table
6
-
7
.
COM2 Pin Descriptions
—
Radio in RS
-
232 Mode
Pin
Number
Radio
Input/
Output
Pin Description
1 --
Reserved—Do not connect
2 --
Reserved—Do not connect
3 --
Reserved—Do not connect
4 -
Ground—Connects to ground (negative supply potential)
on the radio’s PC board.
5 OUT
RXD (Received Data)—Supplies received data to the
connected device.
6 IN
TXD (Transmitted Data)—Accepts TX data from the
connected device.
7 OUT
CTS (Clear-to-Send)
8 IN
RTS (Request
-
to
-
Send
)