Introduction
Tandy's DCM212 1200-bps Intelligent Modem has all the features need-
ed to enhance your data communications applications —including
adata output rate four times faster than that of a300 bits/second
modem.
This direct-connect, Bell 103/212A type modem is not only designed
with standard automatic dial, answer, and disconnect features, but also
with awide range of system configuration enhancements as well. Its
CPU provides operation in both Tandy and Hayes® protocol modes
—each selectable at the flip of aDIP switch. In the Hayes protocol
mode, your Modem is AT-compatible and capable of running with
Hayes software.
After dialing aphone number, the DCM 212 will monitor the call and
report its progress to your computer over the serial RS-232C link. You
can even control the dialing method —pulse or touch-tone —and
the number of times the phone should ring before being answered.
These functions and others are controlled by ASCII (American Stan-
dard Code for Information Interchange) encoded commands that you
program from your computer keyboard over the serial RS-232C inter-
face. Roughly equivalent to atelephone operator making acall, the
DCM 212's features include:
•Waiting as the phone rings until the dialed number is answered
•Hanging up and redialing later if the number is busy, or if the
call has not been answered after aspecified period of time
•Hanging up the handset at the end of acompleted call
One of the DCM 212's more advanced features is the ability to deter-
mine your computer's communications parameters (bit rate, data bits
per word, parity, and stop bits per word), and to adjust its own opera-
tion to meet system requirements using asimple command code
sequence.
Incorporating ahigh degree of intelligence, the DCM212 allows you
to operate your computer virtually unattended when linked to a
telephone, making possible awide 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.
