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XE9624FS2

A Complete Send and Receive Fax & Data Modem

Xecom 

NAME I/O

RESET I

Pin Descriptions

DESCRIPTION

Hardware reset pin, Schmitt input, active HI, TTL. Use of an external

reset is not required

AR O Auxiliary Data/Voice Relay output, active HI, TTL/CMOS. When high,

AR drives an external auxiliary telephone set relay closed to allow the

same telephone line to be used for voice communications.

RXD O

Serial data output to the DTE (i.e. external UART). A logic "high"

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

\DTR I

Data Terminal Ready, input, active LO, TTL. The function of this pin is

set by the &D command and the value in register S21. Normally the

modem ignores DTR.

\AA O Auto Answer enable indicator, output, active LO, TTL/CMOS. A low

indicates the modem is set to automatically answer an incoming call.

\CTS O Clear to Send, output, active LO, TTL/CMOS.

OH O DAA hookswitch relay is closed in the "off-hook" position connecting the

DAA to the telephone line.

TXD I Serial data input from the DTE (i.e. external UART). A logic "high"

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

\RTS I Request to Send, input, active LO, TTL. Not used.

\HS O High Speed indicator, output, active LO, TTL/CMOS. Low when

operating at 2400bps rate, high otherwise.

\RI O Ring Indicator, output, active LO, TTL. When low indicates the modem

is receiving a ring signal.

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

RING —

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

Caution: Observe design rules for Tip & Ring trace layout

XE9624F/XE9624FS

XECOM\3

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