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26 RPT 301 User Manual
K177 Issue No. 3
5 Maintenance
5.1 General
User maintenance on this instrument is limited to checking the LED
indicator, a diagnostic mode and cleaning the case.
5.2 LED Indicator
With the lid of the instrument removed, an LED located on the PCB
flashes when a pressure conversion is carried out. This indicates that
the instrument has power, that the processor is functioning and the
transducer frequency and diode voltage are within normal limits.
5.3 Diagnostic Mode
D - Diagnostic Mode
This command places the instrument into the diagnostic mode.
Command: D, mode
Where: mode is a single digit:
1 Dump all 512 stored values.
2 Dump transducer coefficients (checks LOAD L command).
3 Dump calibration factors i.e. gain, offset etc.
4 Continuous output of sensor diode voltage (temperature) mV.
5 Continuous output of sensor frequency in Hz.
Result: The reply depends on the mode as follows:
Mode 1
32 lines of output as follows:
aaa -
nn nn nn nn nn nn nn nn nn nn nn nn nn nn nn nn<RT>
where: aaa = hexadecimal address offset (0 to 1FFH) and
nn = hexadecimal data