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2.048Mb
p
s Wireless Modem
TECHNICAL: 0118 931 2233
The following commands are set as a default initialisation string in the modem:
AT&f\n
The meaning of this string is initialising default configuration (“n” means “new line”).
An example for a more informative initialisation string is:
AT&f\nATS0=1\nAT&K0\nATS23=3B\nATQ1\n
This default string is consistent with a few modem types, for example MICROCOM desktop.
The meaning of the above string is as follows:
• AT&T – Initialise default configuration.
• ATS0=1 – Auto-Answer after one ring
• AT&K0 - Disable flow control
• ATS23=3B - Rate initialisation set to 9600bps.
• ATQ1 - No messages are output
It is possible to change the modem initialisation string, to configure it to specific modes and
to adopt it to different modems (most AT commands are generic, but some vary from modem
to modem). In order to determine the initialisation string, you must obtain the user’s manual
of the dial-up modem you plan to use, and locate the correct AT commands, resembling the
ones in the default string above. Then you must enter the new initialisation string
accordingly. The maximum length of the string is 50 characters. For example: if you wish to
add to the above example a command that will cause the dial-up modem to dial the phone
number 1234567 using DTMF tone dialling after every reset of the modem, use the following
string:
AT&f\nATS0=1\nAT&K0\nATS23=3B\nATQ1\nATDT 1234567\n
To check that the wireless modem received your new modem string, reset the wireless
modem; on power-up, you should see your string printed on the monitor.
To physically connect a dial-up modem to the 2.048Mbps Wireless Modem, use a straight
RS-232 cable, 9-pin male for the Wireless modem side and 25-pin male for the modem side
(this is the most common interface for modems). This cable is NOT compatible to the
monitor cable supplied with the 2.048Mbps Wireless Modem unit.
To activate the dial-up modem, first connect the RS-232 cable to the monitor interface of the
Wireless Modem and then the modem, and then re-start the wireless modem when the
modem is on.
Note: Dial-up modems and connection cables can be obtained from Black Box.