User's Manual
5634BIF User’s Manual
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Chapter 5 describes the modem commands available to your modem. If you will be using
a data communication software program to send and receive files, you will probably not
need to use these commands, because your software program will handle these tasks for
you. However, if you want to bypass your communication software program and perform
modem tasks directly with your modem, you will find the commands described in this
chapter helpful.
Standard modem commands begin at Table 5-1. MNP/V.42/V.42bis commands begin on
page 37. If a command requires a parameters such as 0 and 1, the parameter is identified
as n in the left column and described in the right column in the following tables.
− Remember that each command, except for +++ and A/, is prefaced by AT and
executed when you press the Enter key. To review the format used to send modem
commands, refer to Chapter 2.
Please refer to Chapter 4 for more information on MNP/V.42/V.42bis error correction and
data compression protocols.
Table 5-1. Standard modem commands
Modem
Commands
Description
+ + + Keep data connection and move from data mode to command
mode
When your modem enters the data mode, typing +++ allows it to
escape to the command mode while preserving the connection to
remote modem.
A Answer command
Force the modem to go off-hook in answer mode without waiting for a
ring. Use this command to manually answer an incoming call.
A/ Re-execute last command
Repeat the last command line it executed. Not preceded with AT nor
followed by pressing the Enter key. This command is useful when you
want the modem to redial a telephone number that was busy. The last
command line executed stays in the modem's memory until power is
turned off or the modem is reset. Either action invalidates the A/
command, because there is no command in memory to execute.
Bn Protocol for 300 or 1200bps operation
0 ITU-T V.21 or V.22 mode when modem is operating at 300 or
1200bps
1 1 Bell 103 or 212A mode when modem is operating at 300
or 1200bps ( default)
Cn Carrier control option
0 Transmit carrier always off (return ERROR response)
1 Normal transmit carrier switching (default)