B-2 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES

Table B-1 AT Command Set Summary (continued)

Command

Function (Example)

Description

 

 

 

&D

DTR control (AT &D0)

&D0 causes digital modem to ignore DTR

 

 

from host.

 

 

&D1 causes digital modem to enter

 

 

command state on detecting on-off

 

 

transition of DTR.

 

 

&D2 causes digital 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 product and options ID.

 

 

I1 displays the flash memory checksum.

 

 

I4 displays the modem product code,

 

 

precomputed checksum, firmware

 

 

revision number, model, interface type,

 

 

country code, and data pump model.

O

Enter connect state (AT O)

Causes the digital 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.

SN?

Read configuration register

Reads a specific S register setting.

 

(AT S60?)

 

SN=

Write configuration register

Writes to a specific S register.

 

(AT S60=64)

 

 

 

 

(continued)

 

 

Page 46
Image 46
3Com DIGITAL MODEM manual Sn?, Sn=

DIGITAL MODEM specifications

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