| 4 | | = How to trigger immediate data transmission = |
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| 5 | | |
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| 6 | | The system will boot with a default ''xmit_period'' of 24*24*60 |
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| 7 | | seconds (unless the default program has been altered.) Thus it will |
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| 8 | | take a full day before the first transmission is sent. Using the |
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| 9 | | Campbell keypad to alter the variables in the running program one may |
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| 10 | | trigger an immediate transmission. |
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| 11 | | |
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| 12 | | First attach the campbell keypad to the CSIO port of the datalogger |
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| 13 | | using the appropriate cable. The keypad may be connected/disconnected |
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| 14 | | at will. |
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| 15 | | |
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| 16 | | Successively pressing the enter key will select the first item in each |
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| 17 | | menu. Doing so three (or four) times brings one to the public |
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| 18 | | variables screen in the running program. Highlighting a variable and |
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| 19 | | pressing enter allows one to modify that variable (which may be later |
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| 20 | | changed by the running program.) |
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| 21 | | |
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| 22 | | The third public variable listed should be ''last_time_sent'' (seconds |
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| 23 | | in the epoch.) A transmission will occur in the next scan loop |
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| 24 | | (typically five or sixty seconds) if this is reset to zero using the |
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| 25 | | keypad. A transmission typically takes between two and three minutes |
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| 26 | | and is evident by the illumination of the LED mounted on the system |
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| 27 | | board. |
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| 28 | | |
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| 29 | | Once the transmission occurs the system will again count up to the |
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| 30 | | ''xmit_period'' before transmitting again. '''Note:''' the system |
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| 31 | | may remotely change the ''xmit_period'' in the running program through the |
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| 32 | | handshake of the transmission. Cycling power on the datalogger will |
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| 33 | | bring back the default ''xmit_period''. |
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