How to trigger immediate data transmission

The system will boot with a default xmit_period of 24*24*60 seconds (unless the default program has been altered.) Thus it will take a full day before the first transmission is sent. Using the Campbell keypad to alter the variables in the running program one may trigger an immediate transmission.

First attach the campbell keypad to the CSIO port of the datalogger using the appropriate cable. The keypad may be connected/disconnected at will.

Successively pressing the enter key will select the first item in each menu. Doing so three (or four) times brings one to the public variables screen in the running program. Highlighting a variable and pressing enter allows one to modify that variable (which may be later changed by the running program.)

The third public variable listed should be last_time_sent (seconds in the epoch.) A transmission will occur in the next scan loop (typically five or sixty seconds) if this is reset to zero using the keypad. A transmission typically takes between two and three minutes and is evident by the illumination of the LED mounted on the system board.

Once the transmission occurs the system will again count up to the xmit_period before transmitting again. Note: the system may remotely change the xmit_period in the running program through the handshake of the transmission. Cycling power on the datalogger will bring back the default xmit_period.