Syntax Description
Example (for channel 1):
1. View currently set analog output scaling (asel command), limits and error level (amode command), and
overrange behavior (aover command):
pass 1300
asel 1
Aout 1 quantity : CO2(0 ... 2000)
amode 1
Aout 1 range (V) : 0.00 ... 5.00 (error : 0.00)
aover 1
Aout 1 clipping :1.00 %
Aout 1 error limit :5.00 %
2. Set analog output overrange clipping to 5 % and error limit to 10 %:
aover 1 5 10
Aout 1 clipping : 5.00 %
Aout 1 error limit : 10.00 %
The analog output now behaves like this:
• Clipping is now set to 5.00 %, meaning the voltage output is allowed to vary between 0 ... 5.25 V. The
analog channel will output the measurement for 0 ... 2100 ppmCO
2
, but range 0 ... 5 V remains scaled to 0 ...
2000 ppmCO
2
.
• Error limit is 10 %, which means the output will show the error state (0 V) when the measured CO
2
concentration is 10 % outside the scaled output range. With the settings above, this will happen if the
measured CO
2
concentration is outside range 0 ... 2200 ppmCO
2
.
• The voltage output will never be above 5.25 V because of clipping: the voltage output is clipped when the
output reaches 5.25 V, and if the measured CO
2
concentration keeps rising above 2200 ppmCO
2
, the output
jumps directly to the error state 0 V.
Chapter 4 – Vaisala Industrial Protocol
47
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