User's Manual

MDS 05-6399A01, Rev. D MDS Master Station 69
6.3.3 COM1 Interface
COM1 supports the RS-232 serial data format at serial data rates of 300, 1200, 2400, 4800, 9600, 19200,
38400, 57600, and 115200 bps (asynchronous only).
Figure 6-5 COM1 Connector (RJ-45)
As viewed from outside the unit
NOTE: COM1 is hard-wired as a DCE device.
Table 6-6. COM1 Pin Descriptions
Pin
Number
Radio Input/
Output Pin Description
1 OUT
DSR (Data Set Ready)
2 OUT
DCD (Data Carrier Detect/Link)—A high indicates signal
received.
3 IN
DTR (Data Terminal Ready)
4
--
Ground—Connects to ground (negative supply potential)
on chassis.
5 OUT
RXD (Received Data)—Supplies received data to the
connected device.
Ground—Connects to ground (negative supply potential)
on chassis.
6 IN
TXD (Transmitted Data)—Accepts TX data from the
connected device.
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.
6.3.4 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.
NOTE: In addition to RS-485 mode, the radio is capable of operating in RS-422 mode. Con-
figure the port for RS-485 but follow the RS-422 wiring arrangements shown in below