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Appendix F - Modem AT Commands
RF300E/RF310E 169
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.
Zn Reset Modem
n = 0 or 1
Default: none
The Z command resets the modem to the configuration last saved by the &W command. The default
values come from the customized configuration in NVRAM.
Z1 is the same as Z0, and functions identically.
&Yn Select Stored Configuration for Hard Reset
n = 0
Default: 0
This command is included for compatibility with applications that issue the &Y0 command. Modem
functions are not changed.
&Y0 selects the profile stored at location 0 on power-up.
Modem Response (Result Code) Commands
ISIHx modems can give responses to commands. The most common is OK, but the modems also
can alert you or your software to dial tones, busy signals, connection speeds, and whether the
connection is made with error correction or compression enabled. These responses are called result
codes; they can be terse (numbers) or verbose (text).
En Echo Command Mode Characters
n = 0 or 1
Default: E1
Normally, when you type commands on the keyboard, the modem echoes the characters back to the
computer or terminal, which displays them on the monitor. Use the E command to turn this feature off
and on.
E0 disables the echo.