Sierra Wireless DART 200 CDPD Modem - Manual (Page 101)

DART 200 CDPD Modem User’s Guide 8 Application Programming
PN1197-00 Revision 1.0 8-7
• Manual registration
• Automatic registration at power-on
• Automatic registration whenever the modem is not registered
• Automatic registration when connection originates
These options are described in detail after Registration Timer.
Registration timer
S-Register 13 is the timing register (default 60 seconds) used in
conjunction with the registration function. For manual operation set this
register to a value in the range of 20 to 30 seconds. If the registration
does not take place within the time period specified in this register, an
error returns. The impact of the timer varies depending on the
registration approach taken.
Manual registration
This option allows either the user or the MAS to control exactly when
the registration will occur. It is implemented by the AT/R1 command.
After issuing an AT\R1
command, the AT command processor is
blocked and the modem does not respond to any AT commands, until the
registration completes successfully or the timer expires.
Since waiting to try another command can be very frustrating, large timer
values (above 60 seconds) are not recommended. Limit manual
registration by AT\R1 to testing situations, and then with the timer value
set in the 20 to 30 second range.
Auto-Registration at power-on
Auto-Registration at power-on lets the DART 200 register itself at
power-on time after acquiring a channel, eliminating the need to execute
an AT\R1 command. The function is set up by the AT\R4 command
which turns on bit 5 (value = 32) of S-Register 57, and by letting
S-Register 13 default to 60 seconds.
After executing these commands, the settings should be saved by an
AT&W command. This feature can be deactivated by the AT\R5
command. The AT command processor is not blocked when this type of
registration is in process.
This function is not the complete answer to automatic registration since
the timer might expire before registration is successful. Also, in instances
where registration is lost due to loss of radio signal, such as in a mobile
application, the register at power-on option is useless unless the modem
can be power cycled.