Multitech MMH900, User Manual

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Appendix J - Internal MMH2834 Composite Link Modem Commands
J.1.4 Configuration and Default Storage Commands
Store Configuration The MMH2834 can store configuration parameters and
& S-Register
S-Register values in its non-volatile read/write Random
Parameters in Access Memory (RAM) memory. The &W command does
Non-Volatile this which prevents any reconfiguration from being lost on
Memory a power-down or Reset (ATZ) condition. &W0 (or
&W AT&W) causes the MMN2834 to store your customized AT
command settings and S-Register values in its nonvolatile
RAM. &W0 also sets the modem so that it reads your
customized settings stored in nonvolatile RAM when powered
down or reset. (The &W0 command only changes the settings
stored in nonvolatile RAM that you specifically intend to alter.
All other default parameters are applicable.)
&W1 causes the MMH2834 not to store your customized settings
to nonvolatile RAM so that, after powering down or resetting the
modem, it reads the factory default settings stored in ROM.
Loading Factory
The &F command provides a choice between customized
Defaults configuration settings in RAM and the factory default configuration
settings in ROM. The &F8 and &F9 commands
&F define the function of the &F command.
The MMH2834 is shipped from the factory with a pre-configured
set of command and S-Register default settings. This set of
factory defaults can be recalled by issuing the &F command. In
addition to being able to recall the factory-installed defaults, the
&F command can also recall those defaults stored under &W0.
This is done using the &F9 command. If you have stored
parameters with the &W0 command and wish these settings to
always be used as your defaults, you would enter &F9&W0.To
return the &F command to read factory installed defaults, enter
&F8&W0. &F8 is the factory default.
Many datacomm programs, including MultiExpress TM and
MultiExpress for Windows TM , issue the &F command
automatically- the &F9 command allows the user to select their
own defaults.Note that the &F8/&F9 commands should be used
with &W0.
Modem Reset The Z command can be used to reset the entire comm
Z mode buffer and the result is the same as if you had disconnected,
and then reconnected power to the modem. When an ATZ
command is executed, the state of the &W command determines
where the default values originate. &W0 defaults come from
RAM and &W1 defaults come from ROM.