XE1214B5 View Datasheet(PDF) - Xecom

Part Name

Description

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XE1214B5

1200bps Component Modem

Xecom 

Pin Descriptions

PIN NAME I/O DESCRIPTION

1

AA

O AA goes low when the XE1214B5 is set in the auto-answer mode,

either by switch input AA DIS (pin 12) or register S0. If the XE1214B5

is not set to automatically answer (pin 12 held low, or S0 = 0), AAl

follows the incoming ring signal, going low for the 4 sec interval

between rings. For display purposes, this output may be used to drive

an external LED through a 330 ohm resistor.

2

\HS

O This output, when low, indicates that the modem is in the high speed

(1200 bps) mode. When high, it indicates that the modem is in the low

speed (300 bps) mode. For display purposes, this output may be used

to drive an external LED through a 330 ohm resistor.

3

\CD

O \CD indicates detection of a remote modem by going low. If the

connection is broken, or never established| \CD remains high. For

display purposes, this output may drive an external LED through a 330

ohm resistor.

4 \DTR

I A low on \DTRallows the XE1214B5toll execute data call commands. If

this input is driven high during a data call, the XE1214B5 terminate the

data call, hang up the phone line and return to the command state.

5 RXDC O The XE1214B5 internal controller (see block diagram) uses RXDC to

transfer serial data in an asynchronous start/stop format at the data rate

selected by the terminal. This data is either the echo of commands

received from the terminal, or result codes generated by the controller

during processing of commands. It is normally high, and should be

"AND"ed with RXDM (pin 8) to form the received data to the terminal.

6 N/C --- No Connection.

7 EHC O External Handset Control, when activated by the H1 Command, is used

to control an additional relay to allow an independent handset to be

connected to the telephone line. During data transmission, when the

relay in the internal DAA is closed (off-hook), this output is low. When

the internal relay is open (on-hook), this output is high,and may be used

to control an external relay to connect a telephone handset to the line.

8 RXDM O The internal modem processor of the XE1214B5B5 (see block diagram)

demodulates the received carrier and outputs data on this pin. A logic

low level is "space" and a logic high is "mark". This output is normally

high, and should be "AND"ed with RXDC (pin 5) to form the received

data signal to the terminal.

2/XECOM

XE1214B5

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