User guide

Chapter 5 - AT Commands

Phone Number Memory Commands

ISIHx modems can store up to 10 telephone numbers in nonvolatile memory. You can store the numbers with

the &Z command and dial them with the ATDS command.

&Zn=s Store a Phone Number

s = phone number

n= 0, 1, 2 or 3

Default: none

You can store a telephone number string in the modem’s phone number memory. You can store

four of these strings using the &Zn=s command. The memory locations are labeled N0

through N3. For example, the telephone number 1-612-555-1212 is stored at memory location

N2 by typing &Z2=16125551212 and pressing

ENTER.

DSn Dial a Stored Number

n = 0, 1, 2, or 3

Default: none

You can automatically dial a telephone number that is stored in the modem’s number memory

by typing ATDSn, where n = 0 through 3. For example, you can dial a number stored at N2 by

typing ATDS2 in terminal mode and pressing ENTER.

Configuration Storage and Recall Commands

The ISIHx stores parameters in two places. It stores factory default parameters in read-only memory (ROM),

and customized parameters in nonvolatile random access memory (NVRAM). You cannot change the default

parameters in ROM, but you can change parameters in temporary memory and then store them in NVRAM as

custom settings. You can then recall the custom settings as if they were factory default settings.

&Wn Store Configuration

n = 0

Default: &W0

The &W command stores current AT commands and S-register values in nonvolatile memory,

so you won’t lose your custom settings when you turn off the modem or reset it.

&W0 (or &W) stores all current AT command and S-register values in nonvolatile random

access memory (NVRAM) and configures the modem so it reads your custom settings in

NVRAM when the modem is turned on or when it is reset with the Z command. The &F reset

command continues to read the factory default settings in ROM.

&Fn Load Default Configuration

n = 0

Default: &F0

ISIHx modems store factory default AT command settings and S-register values in read-only

memory (ROM); they store your custom AT command and S-register values in nonvolatile

random access memory (NVRAM).

The &F0 (or &F) command resets modem to the factory default values stored in ROM.