User's Manual

MDS 05-2708A01, Rev. A MDS TransNET I/O Guide 39

9.2 Data Interface Connections (DB-9)

The DATA INTERFACE connector is used to connect the radio to an external

DTE data terminal that supports the EIA-232 format. The radio supports data

rates of 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 bps

(asynchronous data only).

The

DATA INTERFACE connector mates with a standard DB-9 plug that is

available from many electronics parts distributors. Figure 19 shows the layout

of the DATA INTERFACE connector.Table 11 lists each pin on the connector

and describes its function.

Invisible place holder

Figure 19. Data interface connector (DB-9) pins

As viewed from outside the radio

Table 11. Data interface connector (DB-9) pin descriptions

Number

Input/

Output

Pin Description

1 OUT DCD—Data Carrier Detect

A “high” indicates hopping synchronization.

2 OUT RXD—Received Data

Supplies received data to the connected device.

3 IN TXD—Transmitted Data

Accepts TX data from the connected device.

4 IN Sleep Mode

A ground on this pin turns off most circuits in the radio,

including transmit, receive, modem, and diagnostic

functions. This allows for greatly reduced power

consumption, yet preserves the radio’s ability to be quickly

brought on line. See Section 5.6, Using the Radio’s Sleep

Mode (beginning on page 31) for details.

5 IN Protective Ground

Connects to ground (negative supply potential) on the

radio’s PC board and chassis.