Wake Up, Dc-2212; Switching From High To Low Baud Operation - Tandy DC-2212 Operation Manual

Wake Up, DC-2212!
At the initial power-up - after breaking connection with the telephone lines - the
modem enters an
off-line (or waiting) mode
and remains in this mode until you tell
(command) it what to do next.
The
wake-up
command is the only command the DC-2212 modem responds to while
in the off-line mode (from power-up). It is the auto-baud-rate-detect code sequence
which forces the modem from the off-line status into the command receptive state.
To send this command from your computer or terminal keyboard, press
0 0.
The
screen echoes
* .
You may have noticed that the
*
was not ec;hoed until you pressed
CJ,
the second key
in the auto-baud-rate-detect code sequence. That's because both keys are needed to
determine the baud rate, bit count, and parity (if any) you are using at your computer
or terminal. When the correct baud rate is detected, this character
*
(2A, in hex code)
is output.
Switching From High to Low Baud Operation
The DC-2212 modem automatically synchronizes with the standard 75 , 110, 150, 300,
600, and 1200 baud rates.
Switching from a high speed ( 1200 baud) to a low speed (300 baud) operation occurs
when you wake up the modem. If the wake-up code sequence detects a 1200 baud rate,
the modem communicates in high speed . If it is awakened at 300 baud, low speed
operation is used.
What happens if you wake up the modem in low speed mode, but want to call a high
speed modem? If that modem has low-speed detection circuitry , it selects 300 baud
operation. If it cannot shift baud rates, the originating modem must change its
13