3.4
Description
Dip Switch Setting
In the following table are described all the possible combination to set the communication port (COM1
to COM4) properly.
COM
ADD.
IRQ
1
2
3
4
5
6
7
8
l
1
3F8
4
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
l
2
2F8
3
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
l
3
3E8
4
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
l
4
2E8
3
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
1
3F8
5
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
2
2F8
5
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
3
3E8
5
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
4
2E8
5
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
1
3F8
10
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
2
2F8
10
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
3
3E8
10
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
4
2E8
10
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
1
3F8
11
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
2
2F8
11
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
3
3E8
11
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
4
2E8
11
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
l
= Standard parameters
3.4.
AT COMMAND SET
The modem support AT commands set to define the configuration, initiate or terminate modem
communication, test the modem and the communication link. The modem will work in two
basic operations: command mode and data mode.
Command mode is when the modem is not connected to another modem, therefore “Off Line”
or in a idle condition. In this mode the modem will accept commands beginning with AT prefix.
Data mode is when the modem is connected to another modem, that is an “On Line” condition
or functioning. In this mode all the characters sent from computer are interpreted as data and
they are sent to the remote modem. You may switch from data to command mode by entering
an escape sequence. The default escape sequence is +++ this must have at least one second
before and after being keyed. To go back into data mode simply type ATO.
Data Length
Each caracter of the AT command must be an ASCII code with any of the following format
combinations:
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