1200 BPS DC-2212 Modem (260-1176)      Features        Faxback Doc. # 5684

Tandy's DC-2212 high speed, intelligent modem has all the features needed 
to enhance your data-communications applications--including a data output 
rate four times faster than that of the standard "dumb" modem.

This direct-connect, 212-A type modem is not only designed with standard
automatic dial, answer, and disconnect features, but a wide range of system
configuration enhancements as well. After dialing is completed, the DC-2212
modem monitors the call and reports its progress to your computer over the
Serial RS-232C link.  These functions, which are roughly equivalent to the
functions of an operator making a call include:

* Waiting while the phone rings until the dialed number answers

* Hanging up and redialing later if the number is busy, or if the call has 
  not been answered after a specified length of time.

* Hanging up the handset at the end of a completed call

Each call-progress signal--ring-back, no tone, busy tone, or dial tone--that
the modem detects is printed out as a serial status message on your display.
An auto-disconnect feature permits the modem to disconnect if a carrier 
signal is not maintained after a data call has been set up or upon command.  
This feature is useful in preventing the tie-up of expensive computer 
facilities due to wrong-number calls, failure of the distant party to dis-
connect from a time-sharing system, or line failures.

All functions of the DC-2212 modem are controlled by ASCII (American National
Standard Code for Information Interchange) encoded commands that you program
from your computer keyboard over the serial RS-232C interface. For example,
you can control the selection of pulse or tone dialing through the dialer
programming mode command, or the number of times the phone is to ring before
being answered by using the advanced programming enable command.

One of its advanced features is the ability to determine your computer's
communications parameters--baud rate, data bits per word, parity, and stop
bits per word--and adjust its own operation to meet system requirements, 
using a simple command code sequence.

Designed with a high degree of intelligence, the DC-2212 allows you to 
operate your computer virtually unattended when linked to a telephone--
making possible a wide range of telecommunications applications. Used 
with the proper applications software package, the modem is capable of 
performing operations such as electronic mail and shopping, central-data-
base access, home banking and remote-peripheral sharing.

This manual, in the sections following, will describe how you can use the
DC-2212 modem to call (originate) a host computer or information service, or
receive (answer) a call from another computer, either manually or
automatically. Additionally, you will learn how using the modem's advanced
features can actually enhance your communications applications.

(dtc-08/04/93)