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10 MDS 4710/9710 I/O Guide MDS 05-3305A01, Rev. D

2.6 Data Interface Connections

Connect the transceiver’s DATA INTERFACE connector to an external

DTE data terminal that supports the EIA-232 (formally RS-232) format.

The transceiver supports autobaud asynchronous data rates of up to

19200 bps. The data rate at the

DATA INTERFACE connector might differ

from the data rate used over the air.

Table 6 lists each pin on the

DATA INTERFACE connector and describes

its function.

Do not use a 25 wire (fully pinned) cable for connection to the

DATA

INTERFACE

connector. Use only the required pins for the application.

Damage can result if improper connections are made. Typical applica-

tions require the use of only Pins 1 through 8 for EIA-232 signaling.

CAUTION

USE ONLY

REQUIRED

PINS

Table 6. DATA INTERFACE Connector Pinouts

Number

Input/

Output Pin Description

1--Protective Ground. Connects to ground (negative supply

potential) on the radio’s PC board and chassis.

2INTXD—Transmitted Data. Accepts TX data from the

connected device.

3 OUT RXD—Received Data. Outputs received data to the

connected device.

4INRTS—Request-to-Send Input. Keys the transmitter when

RTS is at logic high.

5 OUT CTS—Clear-to-Send Output. Goes “high” after the

programmed CTS delay time has elapsed (DCE) or keys

an attached radio when RF data arrives (CTS KEY).

6 OUT DSR—Data Set Ready. Provides a +6 Vdc DSR signal

through a 2.5 kΩ resistor.

7--Signal Ground. Connects to ground (negative supply

potential) at radio’s PC board.

8 OUT DCD—Data Carrier Detect. Goes “high” when the modem

detects a data carrier from the master station.

9INTransmit Audio Input. Connects to the audio output of an

external (AFSK) modem. The input impedance is 600 Ω.

Use Pin 7 for the modem’s return lead.

10 OUT RUS—Receiver Unsquelched Sensor. Not used in most

installations, but is available as a convenience. Provides

+8 Vdc through a 1 kΩ resistor whenever the receiver

squelch is open, and drops to less than 1 Vdc when the

squelch is closed.

11 OUT Receive Audio Output. Connects to the audio input of an

external (AFSK) modem. The output impedance is 600 Ω,

and the level is factory set to suit most installations. Use

Pin 7 for the modem’s return lead.

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MDS MDS 9710 Series Specifiche Pagina 18

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