5 self diagnostics, Self diagnostics – Setra System Model 470 User Manual
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3.
Transmit a sequence of 1’s and 0’s in which each 1 or 0 corresponds to an engineering
unit of measure in the sequence listed below. Transmit a 1 to enable, or a 0 to disable,
selection of the corresponding units. The sequence of units is:
“units” (the user programmable units)
hPa
PSI
mbar
mm Hg
in Hg
mm H20
in H20
feet
meters
Each 1 or 0 must be followed by an S, for SETUP.
For example, to set up the CONVERT function so that it changes the units in which data is
reported directly from “in Hg” to “feet” and back again, eliminate all other units from the
sequence by transmitting the following command:
R-2222SS 0S 0S 0S 0S 0S 1S 0S 0S 1S 0S
4.
At least one pressure unit must be enabled. If you attempt to disable all of the units of
pressure, the transducer will ignore the entire sequence.
5.5
Self Diagnostics
The Setra 470 has a built-in self diagnostic procedure. This procedure verifies that the trans-
ducer is fully operational (but cannot verify proper calibration) by doing a test on internal memory
and the microprocessor architecture.
To execute the diagnostic procedure:
1.
Use the CONVERT function (see Section 4.2) so that the 470 reports data in units of
pressure in response to an interrogation. (i.e., the transducer should not be reporting in units
of altitude.)
2.
Set the baud rate of the Setra 470 to 2400. Be sure to follow the procedure to change
the baud rate in nonvolatile memory, as in Section 5.2, part B.
3.
Set the baud rate of the host computer or data acquisition system to 2400.
4.
Transmit -8888S. This is the Diagnostic access code. The 470 will respond
“D-NOS”.
5.
Transmit S.
6.
The Setra 470 reports “BUSY” while it is performing the diagnostics.
7.
The Setra 470 next reports “PASS” if all the diagnostic tests are completed successfully.
If the transducer reports an error message (i.e., any message including the series of charac-
ters “ERR”) instead of “PASS”, a fault exists in the hardware. Contact Setra for help in
diagnosing the problem, and for repair if necessary.