AT Command Set

B-2

Table B-1 AT Command Set Summary (continued)

 

 

 

 

 

 

 

Command

Function (Example)

Description

 

 

 

 

 

 

&D

DTR control (AT &D0)

&D0 causes ISDN modem to ignore DTR

 

 

from host.

 

 

&D1 causes ISDN modem to enter command state on detecting on-off transition of DTR.

&D2 causes ISDN modem to hang up current calls upon on-off transition of DTR and prepares serial port to accept AT command at any speed (default).

EAT command echo (AT E0) E0 disables the echo of AT commands back to the host computer.

 

 

E1 enables the echo of AT commands to

 

 

the host computer (default).

&F

Restore factory defaults (AT &F)

Restores all factory default settings.

H

Hang up (AT H)

Hangs up the current connections.

I

Identification (AT I0)

I0 displays the model number.

 

 

I1 displays the flash memory checksum.

 

 

I2 computes and compares the flash

 

 

memory checksum to a prestored value.

 

 

I3 displays the product name and release

 

 

number.

O

Enter connect state (AT O)

Causes the ISDN modem to go out of

 

 

command mode into on-line mode.

QResult code control (AT Q0) Q0 enables the output of result codes (default).

 

 

Q1 disables the output of result codes.

 

 

Q2 disables the output of result codes in

 

 

answer mode only.

\Q

Serial port flow control (AT \Q1)

\Q0 disables flow control.

 

 

\Q1 enables bidirectional XON/XOFF

 

 

software flow control.

 

 

\Q3 enables bidirectional RTS/CTS

 

 

hardware flow control (default).

%R

Read all S registers (AT %R)

Provides an output list of all S registers.

%S

Serial number

Displays serial number of ISDN modem.

Sn?

Read configuration register

Reads a specific S register setting.

 

(AT S60?)

 

 

 

 

(continued)

 

 

Page 84
Image 84
3Com 3C882 Host computer default, Hang up AT H, Identification AT I0 displays the model number, Number, Answer mode only