1200 BPS DC-2212 Modem (260-1176) Settings Information Faxback Doc. # 5688

When you have made the peripheral connections as outlined on page 35,
CONNECTING THE MODEM, you are ready to power-up and load your communications
software.

When the power is freshly applied, several of the LED indicators on the
modem's panel will illuminate--and remain lit, depending on the status of 
the computer's protocol. These six indicators show the modem's internal and
external operation status.

(1) HIGH SPEED. Lights when the modem is in high speed (1200 baud)
    communications.

(2) OFF-HOOK. Lights when your modem is on-line (connected to the phone
    lines).

(3) TERMINAL READY. Lights when the terminal is supplying DTR.

(4) CARRIER DETECT. Lights when the modem receives a carrier tone or 
    generates a false carrier.

(5) TRANSMIT DATA. Lights when the modem is transmitting data.

(6) RECEIVE DATA. Lights when the modem is receiving data.

Your DC-2212 modem permits a computer or terminal to communicate with a 
remote computer by converting that computer's electrical signals into 
audio tones that can be efficiently handled by the telephone system.

Likewise, the audio tones that the modem receives are converted back to
electrical signals that are understood by the computer.

SETTING COMMUNICATIONS PARAMETERS

The DC-2212 modem provides data communications in full or half duplex mode 
at either 0-300 bits per second (asynchronous) or 1200 bps (synchronous or
asynchronous). Transmission speed is always selected by the originating 
modem.

AUTOMATIC ORIGINATE MODE operation is a default (preset) condition upon 
first power-up. When opened for programming with the auto-baud-rate-detect 
code (WAKE UP, DC-2212!), the modem automatically synchronizes the baud rate,
word length, parity, and stop-bit numbers of your computer system.

When programmed for AUTOMATIC ANSWER MODE operation, the modem adapts the
communications protocol of the remote computer system upon receipt of a
telephone-line-ringing signal. This auto-answer feature makes it possible 
for data transmission to occur between a remote terminal interfaced to a 
modem and your computer system--without intervention from the operator.

Refer to your computer owner's manual or applications software user's guide 
if you require instructions on setting communications parameters.

OPTIONAL MODEM CONFIGURATIONS

The DC-2212 modem has four internal configuration options. THESE OPTIONS 
MUST BE PERFORMED BY A QUALIFIED RADIO SHACK SERVICE TECHNICIAN.

* Multi-line phone operation

* RS-232 protocol extension

* Synchronous mode operation

OPTION 1. MULTI-LINE PHONE OPERATION

This option allows the DC-2212 modem to be used with multi-line telephones.
Internal circuitry can be configured to signal a local network that there is 
a MODEM on the line instead of a telephone. Unless the modem is modified
internally, the local network will start flashing the BUSY indicator on the
multi-line telephone when the modem seizes the line!

OPTION 2. RS-232 PROTOCOL EXTENSION

There are two RS-232C lines that may be enabled to supply your computer 
with further information. These are RI and HS lines.

The DC-2212 has the option of signaling the RS-232 cable that the telephone 
is ringing. The RI pin on the RS-232 cable will toggle at the ringing rate
anytime the modem is connected to a ringing line. The HS pin on the RS-232 
may be enabled to supply the terminal (computer) with high speed indication 
if the modem switches to 1200 baud mode upon on-line condition.

OPTION 3. SYNCHRONOUS MODE OPERATION

This option allows you to communicate in synchronous mode. In this mode, all
automatic features are disabled and only manual operation is allowed. A 
jumper is used to determine if you will be required to use INT CLOCKing.

(dtc-08/04/93)