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APPENDIX B - SENSOR TAG NAMES
This is a summary of the commands used by the Data Logger Programming
Language (DLPL) to read the sensors that are built in to the HDL1. Commands must
be entered exactly as shown below as the DLPL is case sensitive. Tag Names are
specific to the HDL1 data logger.
Note:
Returned values from all of the tag names are full accuracy floats. The
restriction of decimal places does not occur until the data is logged to
memory. This means that any intermediate calculations are done to
full accuracy, and round-off errors are minimized.
RAIN
RAIN COUNT
RnCnt
Get number of rain tips that have occurred since power-on. The range is 0
to 65535, then rolls back to 0. This allows determining rainfall over any
interval by subtracting the counts at the start and end of the interval and
multiplying by the amount of rain per tip (usually 0.01 inches).
POWER
BATTERY VOLTAGE
D_Cell Get the current battery voltage. The units are volts, and the range is 0.0 to
25.4. This is the voltage present at the BATTERY connector.
TELEMETRY VOLTAGE
Telem
Get the current Telemetry voltage. The units are volts, and the range is 0.0
to 25.4. This is the voltage present at the TELEMETRY connector.
SDI VOLTAGE
SdiV
Get the current SDI-12 bus power voltage. The units are volts, and the
range is 0.0 to 25.4. This is normally generated by the logger, rather than
being supplied externally, so should remain at about 12 volts under normal
operating conditions. Heavy power drains on the SDI bus or low batteries
may cause it to read lower. Note that the SDI specifications call for this to
never drop below 9.6 volts, so any SDI sensor readings taken when this
voltage is below 9.6 volts are suspicious.
Summary of Contents for HDL1
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