C-Link Protocol Commands
Calibration
Thermo Electron Corporation Model 42i Low Source Instruction Manual B-25
Send: set no coef 1.005
Receive: set no coef 1.005 ok
no gas
no2 gas
nox gas
high no gas
high no2 gas
high nox gas
low no gas
low no2 gas
low nox gas
These commands report the NO, NO
2
, and NO
x
span gas concentrations
used to auto-calibrate NO, NO
2
, and NO
x
coefficients. The high and low
commands are only available in dual and auto range mode. If the mode is
incorrect, the instrument responds with “can’t, wrong settings”. The
example below shows that the NO low span gas concentration is 24,000
ppm.
Send: low no gas
Receive: low no gas 2400E+1 ppm
set no gas value
set no2 gas value
set nox gas value
set high no gas value
set high no2 gas value
set high nox gas value
set low no gas value
set low no2 gas value
set low nox gas value
These commands set the NO, NO
2
, and NO
x
span gas concentrations used
by the auto-calibration routine to value, where value is a floating-point
representation of the gas concentration in current selected units. The gas
units are the same as those chosen by the user. The example below sets the
NO span gas concentration to 1234 ppm.
Send: set no gas 1234
Receive: set no gas 1234 ok
no bkg
nox bkg
These commands report the current NO and NO
x
backgrounds. The
example below reports that the NO background is 5.5 ppb.
Send: no bkg
Receive: no bkg 5.5 ppb
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