Modem Response (Result Code) Commands - Multitech CommPlete MT3334HD8 User Manual

&Fn Load Default Configuration
n = 0, 8, or 9
Default: &F8
MT3334HD8 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 the modem to the factory default values stored in ROM or to your
custom values stored in NVRAM, depending on whether you last stored an &F8 or an &F9 command.
When &F8 is stored and an &F command is issued, the modem reads the factory default settings stored in
ROM.
When &F9 is stored and an &F command is issued, the &W setting determines whether the modem reads
settings stored in NVRAM or ROM. If the modem is set to &W0, it reads your custom settings stored in
NVRAM. If the modem is set to &W1, it erases your stored settings (including the &F9 command) and
reads the factory default settings stored in ROM. Many communications programs issue the &F command
automatically—the &F9 command allows you to select your own defaults.
Note that for either an &F8 or an &F9 command to be effective after a reset it must be stored using the
&W0 command.
Table 2 summarizes how the &F and Z reset commands interact with the &W command; note that the &F
reset command operates differently from the Z reset command:
Table 2. Where the Modem Reads Configuration Parameters
Previous Command
AT&W1 (default)
AT&W0
AT&F8&W0
AT&F9&W0
Z Reset Modem
The Z command resets the modem to its default configuration and clears the command buffer. The result
is the same as turning the modem off and on. When you type ATZ, the state of the &W command
determines where the default values originate. &W0 defaults come from the customized configuration in
NVRAM, and &W1 defaults come from the factory default configuration in ROM. Because Z clears the
command buffer, it must be the last command in a command string; normally it is issued by itself: ATZ.
Note that the Z reset command operates differently from the &F reset command. See Table 2 on page 21.

Modem Response (Result Code) Commands

The MT3334HD8's modems can give responses to commands. The most common one 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 ,
and they can be terse or verbose, Multi-Tech or standard, basic or extended.
CommPlete Communications Server
AT&F Power-On and ATZ
ROM ROM
ROM NVRAM
ROM NVRAM
NVRAM NVRAM
3 AT Commands
21