PSI-DATA/BASIC-MODEM/RS232
6-2
PHOENIX CONTACT
102906_01_en
6.1
Command Descriptions
AT
Attention String
AT
is the prefix of a command line and must be entered at the start of each command line
(except for the
A/
command or the
+++
Escape string). The Attention characters transmit
the transmission speed, character format, and parity of your computer or terminal to your
modem.
A
Manual Answering
Use the
A
command to manually answer a call. The
A
command can also be used to
convert voice communication into data communication: Once you have completed the
spoken part of the call, the caller enters the
ATD
command and ENTER to enable data
transmission. The partner responds with the
ATA
command and ENTER. Your modem
does not execute any commands that appear after the
A
in the command line. You must
therefore enter all settings
before
the
A
command.
A/
Repeat the Previous Command
The
A/
command instructs the modem to repeat the previous command line (i.e., the last
command that it stored in its memory). You can use the
A/
command to redial a number if
the line was busy on the first attempt or it could not connect.
B
Set the CCITT or Bell Transmission Method
The
B
command can be used to operate your modem in Bell and/or CCITT mode. This
command is only relevant for transmission speeds from 300 to 1200 bps. For all other
speeds, only CCITT modulation is used.
If you attempt to execute a command line that does not start with
AT
, an error message
is generated (except when repeating a command with
A/
or using the
+++
Escape string).
The
A/
command does not have to be preceded by
AT
or confirmed by pressing ENTER.
You can use the
A/
command to repeat the last command line as many times as you wish
until the command is deleted from the modem memory by either resetting the modem or
entering a new command line.
B0
Use CCITT modulation
B1
Use Bell modulation