Virtual Modem Initialization Commands

 

 

 

 

 

 

 

 

 

 

 

 

Command

Description

Options

 

 

 

 

 

 

 

AT&Z1

Set command allows the user to store an IP

 

 

 

 

address and port number or phone number to

 

 

 

 

use when making a connection. The user will

 

 

 

 

issue an ATDS1 to cause the IOLAN to initiate

 

 

 

 

the connection.

 

 

 

 

 

 

 

 

AT&Sn

Sets the behavior of IOLAN’s DTR signal.

n=0, DTR signal always high.

 

 

 

(DSR from a DCE perspective)

(default)

 

 

 

 

n=2, DTR signal acts as DCD.

 

 

 

 

n=3, DTR signal acts as RI.

 

 

 

 

 

 

 

AT&Rn

Sets the behavior of IOLAN’s RTS signal. (CTS

n=0, RTS always high. (default).

 

 

 

from a DCE perspective)

n=3, RTS signal acts as DCD.

 

 

 

If line is configured for hardware flow control,

n=4, RTS signal acts as RI.

 

 

 

the RTS is used for this purpose and the setting

 

 

 

of this command is ignored.

 

 

 

 

 

 

 

 

AT&Cn

Sets the behaviour of the DCD signal.

n=0, DCD always on.

 

 

 

 

n=1, DCD follows state of

 

 

 

 

connection (off when no

 

 

 

 

connection, on when TCP

 

 

 

 

connection exists). (default)

 

 

 

 

 

 

 

AT&F

Sets the modes back to the factory defaults. This

 

 

 

 

is a hard-coded default configuration which

 

 

 

 

does not look at any user configuration.

 

 

 

 

 

 

 

 

ATS2

Sets the value of the S2 register. The S2 register

 

 

 

 

controls which character is used to enter

 

 

 

 

"command" mode. (this is the potential

 

 

 

 

replacement for the +++ (default) in front of the

 

 

 

 

ATH command).

 

 

 

 

This register will hold the hex value of the

 

 

 

 

"escape" character. Any value > 27 will disable

 

 

 

 

the ability to escape into "command" mode.

 

 

 

 

 

 

 

 

ATS12

Sets the value of the S12 register. The S12

 

 

 

 

register controls the minimum length of idle

 

 

 

 

time which must elapse between the receipt of

 

 

 

 

the escape character and the A (first character of

 

 

 

 

the ATH sequence). Units are 1/50th of a

 

 

 

 

second. The default is 50 = 1 second.

 

 

 

 

 

 

 

 

ATO

(ATD with no phone number) Establishes a

 

 

 

 

connection using the IP and port specified in the

 

 

 

 

telephone number field.

 

 

 

 

 

 

 

 

ATDS1

Establishes a connection using the IP and port

 

 

 

 

(or phone number) specified in the Phone

 

 

 

 

Number field (stored by the AT&Z1 command).

 

 

 

 

 

 

 

Virtual Modem AT Commands 203

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Perle Systems DS1, TS2 manual AT&Sn, AT&Rn, AT&Cn
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DS1, TS2 specifications

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