1200 BPS DCM-212 Modem (260-1385A)       Options        Faxback Doc.# 5958

The DCM-212 modem has two internal configuration options. These options 
must be activated by a qualified Radio Shack service technician.

* Multi-line phone operation
* RS-232 protocol extension

MULTI-LINE PHONE OPERATION

This option allows you to use the DCM-212 Modem with multi-line telephones.
You can configure the internal circuitry to signal a local network that
there is a modem on the line instead of a telephone. When 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.

RS-232C PROTOCOL EXTENSION

There are two RS-232C lines that you can enable to supply your computer with
more information. These are the RI and HS lines.

The DCM-212 has the option of signaling the RS-232C cable that the telephone
is ringing. The RI pine (No. 22) on the RS-232C cable toggles any time the
modem is connected to a ringing line. The HS pin (No. 12) on the RS-232 can
bee enabled to supply the terminal (computer) with high speed indication if
the modem switches to 1200 bps upon an on-line condition.

(dkh-08/04/93)