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 and describes each pin on the
DATA INTERFACE
connector.
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.
ÝßËÌ×ÑÒ
USE ONLY
REQUIRED
PINS
Table 6. DATA INTERFACE Connector Pinouts
Pin
Number
Input/
Output
Pin Description
1
--
Protective Ground.
Connects to ground (negative supply
potential) on the radio
s PC board and chassis.
2
IN
TXD
—
Transmitted Data.
Accepts TX data from the
connected device.
3
OUT
RXD
—
Received Data.
Outputs received data to the
connected device.
4
IN
RTS
—
Request-to-Send Input.
Keys the transmitter when
RTS is at logic high.
5
OUT
CTS
—
Clear-to-Send Output.
Goes logic 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 k resistor.
7
--
Signal Ground.
Connects to ground (negative supply
potential) at radio
s PC board.
8
OUT
DCD
—
Data Carrier Detect.
Goes to logic high when the
modem detects a data carrier from the master station.
9
IN
Transmit Audio Input.
Connects to the audio output of an
external (AFSK) modem. The input impedance is 600 .
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 k 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 ,
and the level is factory set to suit most installations. Use
Pin 7 for the modem
s return lead.
12
IN
Radio Inhibit (Sleep).
A ground on this pin places the
radio in sleep mode. It 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 online.
05-3305A01, Rev. E 11
Summary of Contents for 1710 Series
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