10-112
Using the LI-8150 Multiplexer
Raw CO2 CO
2
raw signal in sample analyzer.
Raw CO2 Ref CO
2
raw signal in reference analyzer.
Raw H2O H
2
O raw signal in sample analyzer.
Raw H2O Ref H
2
O raw signal in reference analyzer.
RH% Relative humidity inside the soil chamber.
V1 Aux Input at voltage channel 1.
V2 Aux Input at voltage channel 2.
V3 Aux Input at voltage channel 3.
V4 Aux Input at voltage channel 4.
T1 Aux Input at thermocouple channel 1, in degrees C.
T2 Aux Input at thermocouple channel 2, in degrees C.
T3 Aux Input at thermocouple channel 3, in degrees C.
T4 Aux Input at thermocouple channel 4, in degrees C.
CRC Cyclic Redundancy Check (see below)
Strip Remove markup from data (see below)
CRC (Cyclic Redundancy Check) is an algorithm that is used to verify the integrity
of the data. Before each data packet is sent by the LI-8100A, a CRC is calculated
(pre-transmission) for that packet, and then appended to the packet. When the
client (e.g. the computer) receives the packet, it strips off the appended CRC and
calculates its own CRC (post transmission). If the two CRC values match, it is
assumed that the packet was transmitted correctly. When CRC values are
appended to the data packet, the value is automatically marked up. A typical CRC
will appear as
<CRC>3067450353</CRC>
Disable 'CRC' to remove CRC from the data. Note that the LI-8100A PDA
applications do not use CRC checking.
Note that when the LI-8100A outputs data, each field is "marked up" using
eXtensible Markup Language (XML) to delimit that field. For example, when a CO
2
value is output, the data value is placed between two "tags" that describe what that
value is, as in:
<CO2>350.21</CO2>
Enable the 'Strip' field to remove the markup from the data stream. The resulting
data set is a data stream where each data field is separated by a space.
TCP/IP
Tap on the TCP/IP field to configure the data values to be sent via the wireless card,
if desired. Note that you can configure the TCP/IP (wireless) and/or RS-232 options
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