The factory-set (in the program that shipped from SRI) default transmission period is one day. Twenty-four hours from the moment the datalogger is powered-up the first transmission will occur. This is defined by the program variable xmit_period [seconds], which may be changed by either loading a program with a different value, or changing the value in the running program.
- Altering the running program's value will not affect the program's value should the datalogger be re-energized. If the power is cycled the program's value will again take effect.
The xmit_period may also be changed by base receiving end. Following the reception of a complete dataset the base station may upload a new xmit_period. This allows the base station to control, to some degree, the power consumption. This is a synchronous activity; a successful transmission must be initiated by the datalogger for the base station to modify the next xmit_period.
When the datalogger receives a new xmit_period it performs some basic checking to ensure a proper value. The xmit_period must be a whole hour, must be at least one hour, and must be less then fourteen days.
