Installation guide

5-19

AT Commands

NPort Express supports the following common AT commands used with a

typical modem:

o. AT command Description Remarks

1 ATA Answer manually

2 ATD <IP>:<Port> Dial up the IP address : Port No.

3 ATE ATE0=Echo OFF

ATE1=Echo ON (default)

4 ATH

ATH0=On-hook (default)

ATH1=Off-hook

5 ATI, ATI0, ATI1, ATI2 Modem version reply “OK” only

6 ATL Speaker volume option reply “OK” only

7 ATM Speaker control option reply “OK” only

8 ATO On line command

9 ATP, ATT Set Pulse/Tone Dialing mode reply “OK” only

10 ATQ0, ATQ1 Quiet command (default=ATQ0)

11 ATSr=n Change the contents of S register See “S registers”

12 ATSr? Read the contents of S register See “S registers”

13 ATV

Result code type

ATV0 for digit code,

ATV1 for text code

0=OK

1=connect (default)

2=ring

3=No carrier

4=error

14 ATZ

Reset (disconnect, enter command

mode and restore the flash settings)

15 AT&C

Serial port DCD control

AT&C0=DCD always on

AT&C1=DTE detects connection

by DCD on/off (default)

16 AT&D

Serial port DTR control

AT&D0=recognize DTE always

ready

AT&D1, AT&D2=reply DTE when

DTR On (default)

17 AT&F Restore manufacturer’s settings