Sierra Wireless DART 200 CDPD Modem manual Registration timer

DART 200 CDPD Modem User’s Guide 8 Application Programming

∙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.

PN1197-00 Revision 1.0 8-7