XE1276 データシートの表示（PDF） - Unspecified

部品番号

コンポーネント説明

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XE1276

Compact 1200 bps Modem

Unspecified 

Pin Descriptions

PIN NAME

DESCRIPTION

1

TST

This output is for Xecom test purposes only;

2

N/C

No Connection

3

N/C

No Connection

4 \DCD

DCD, Data Carrier Detect, is an active low output from the modem. DCD goes low to

indicate receipt of a valid carrier signal.

5 \DTR

DTR, Data Terminal Ready, is an active low input to the modem. DTR must be present for

the XE1276A to remain on line. If DTR goes high while the modem is on line, the modem

disconnects immediately. The XE1276A will not automatically answer an icoming call if DTR

is not active.

6

D/V

The D/V, Data/Voice, output can be used to drive a relay to connect an auxiliary telephone

handset. D/V is high when the modem is off-hook And low when the modem is on-hook.

7

OH

OH, Off-Hook, is an active high output which indicates that the XE1276A is connected to the

telephone line.

8

RXD

RXD, Received Data, provides the serial data output path from the modem. A logic "high"

represents a "mark" and a logic "low" represents a "space".

9

TXD

TXD, Transmit Data, provides the serial data input path from the host. A logic "high"

represents a "mark" and a low represents a"space", TTL.

10 N/C

No Connection

11 SPK

SPK, Speaker, provides the Audio output to the modem speaker. Speaker operation is

determined by the ATL and ATMM commands . This output can drive a 300 ohm load.

12

VO

The Modem Line Interface permits placement of non-modem signals on the telephone line

through the modem's telephone interface. VO must be tied to VI for normal modem operation

and open to place non-modem signals on the line through VI.

13

VI

VI, Voice Interface, provides a path for non-modem signals to be placed on the telephone line

through the modem's telephone interface. VI must be tied to VO for modem operation.

14

TIP

Tip connection to the phone line(RJ11 pin3) from the internal DAA.

15 RING

Ring connection to the phone line(RJ11 pin4) from the internal DAA.

16

Vcc

+5 Volt power for the modem.

17 GND

Ground reference for the modem.

18

RI

RI, Ring Indicator, provides an active high output whenever a ring signal appears on the

telephone line.

XECOM

(3)

XE1276A

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