User's Manual

Performing Advanced Functions
meter = raw / 8191 * 4 + 1
so n=2, a(0)=1, a(1)=0.0004883408619.
More generalized: Be Smax the maximum value of the sensor in
engineering units and Smin be the minimum value of the sensor in
engineering units. Thus
a(0) = Smin
and
a(1) = (Smax - Smin) / 8191
Sensors with 0 to 20mA interface are to treat in the same way. For sensors
with 4 to 20mA interface the calculation has to be slightly changed
a(0) = (5 * Smin - Smax) / 4
and
a(1) = (Smax - Smin) * 5 / (8191 * 4)
o <range>:
0: 0 .. 1 V
1: 0 .. 2.5 V
2: 0 .. 5 V
3: 0 .. 10 V
4: 0 .. 20 mA
5: 4 .. 20 mA
6: analog to digital conversion (measurements are in the range
of 0 .. 10 Volt); for meaning of conversion parameters see
description of <a(0)>, <a(1)>.
o <spt>: — The sensor power time is given in 0.5 second steps (0
means no sensor power needed)
• 1: Digital channel:
o 0: Frequency measurement with parameters: <address>
<fast> <gatetime>
o 1: Pulsecounters with parameters: <address> <fast>
o 2: Hi/Lo with parameters: <address> <fast>
<fast>: 0: input is slow (filtered, 10Hz)
1: input is fast (not filtered, 10kHz)
<gatetime>: in seconds (1..60)
• 2: Internal sensors (raw values):
o 0: Voltage of internal battery volts = raw_value * 20 / 255.
(a(0)=1, a(1)=20/255)
o 1: Voltage of external power supply volts = raw_value * 40 / 255
(a(0)=1, a(1)=40/255)
o 2: Temperature celsius = raw_value * 400 / 255 - 68
(a(0)=-68, a(1)=400/255)
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