Operational Overview
Doc.#6000-0015 Rev: A
Page 22
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Signal conditioning calibrations. There are several types of
SIOs depending on the required sensor signal conditioning
(e.g., voltage, current). The calibration values for these signal
conditioning circuits are stored in the µP memory.
2. Signal conditioning electronics for the sensor. There are various
types of SIO depending on the required signal conditioning. For
example, RTDs require both an RTD excitation current and signal
amplification. All SIOs output a high level 0 to +5V signal to the
node (the actual levels are actually about 0.125 to 4.9V). This
improves the signal-to-noise performance of the system. It also
allows SIOs to be used with cables longer than the standard 3 foot
length that comes with the unit; maximum range, however, will
depend upon operating environment.
3. Terminal block for connection to an external sensor. A
four-terminal block is supplied. Terminal block connections are
described in the next section,
Connecting Sensors to SIOs.
4. Standard, shielded, CAT5 cable with identical RJ45 connectors on
each end is used for connecting Nodes and SIOs.
Connecting Sensors to SIOs
Table 2 shows the CrossNet SIOs.
Table 2. CrossNet Sensors
SIO Model
Description
Voltage Sensor
Sensor Output Voltage
SC110
0 to +5 volts
SC111
0 to +10 volts
SC112
-5 volts to +5 volts
SC113
-10 volts to +10 volts
Current Sensor
Sensor Output Current
SC210
4 to ± 20 mA output current
RTD Sensor
RTD Type
SC510
100 Ohm, temperature range - TBD
SC511
1000 Ohm, temperature range - TBD
Bridge Sensor
Sensor Output
SC410
0 to +5 volts
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