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M4557 - Model 9210 Nitriding Controller
SSi Manual SERIES 9210-M4557-Nitriding Page 61 of 61
Quantity: is one of H2 CO CO2
xxxx: is the measured quantity. The resolution is the same as the display:
Unit: is one of % percent r compensation ratio
The compensation ratio is the diagnostic data for instruments with a secondary gas background. When
requested as a data it will return the present ratio for compensating the primary measured gas “R1”
I.e. for H2 in N2 with a secondary gas of CO2
D1 CO2=0.069r If you know the concentration of the CO2 can calculate the correction in the H2 reading as
H2- ( CO2 * 0.069)
In over-range condition (when the display shows ‘HI’) xxxxx will be ‘+++++’ In under-range condition
(when the display shows ‘LO’) xxxxx will be ‘-----’
Controller. Sensor
Reading R1 H2= 98.5% Instrument request a
reading
Span=99.0 S1 Pass Controller requests a span
setting of 99.0%
Reading R1 H2= 99.0%
I.e. this would set the present instrument reading to 99.0% The unit “%” is assumed to be the same as the
reading.
Error messages
Error messages take the form ‘? xx’ where ‘xx’ is a numeric code as explained below Comms. Errors:
Code Error Description
90 Buffer overflow More than 15 characters were received without message terminator
(<CR><LF>). Any subsequent characters will begin a new message.
91 Message timeout 10 seconds has elapsed since the last character was received
without message terminator.
92 Bad opcode Message was received correctly terminated but not understood (e.g.
‘Fred=1<CR><LF>’)
93 Bad operand Message was received correctly terminated and understood but the
line number wasn’t (e.g. ‘Reading=Q<CR><LF>’).