M4557 - Model 9210 Nitriding Controller
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
Controller. | Sensor |
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Reading | R1 H2= 98.5% | Instrument request a |
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| reading |
Span=99.0 | S1 Pass | Controller requests a span |
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| setting of 99.0% |
Reading | R1 H2= 99.0% |
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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 |
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90 | Buffer overflow | More than 15 characters were received without message terminator |
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| (<CR><LF>). Any subsequent characters will begin a new message. |
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91 | Message timeout | 10 seconds has elapsed since the last character was received |
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| without message terminator. |
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92 | Bad opcode | Message was received correctly terminated but not understood (e.g. |
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| ‘Fred=1<CR><LF>’) |
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93 | Bad operand | Message was received correctly terminated and understood but the |
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| line number wasn’t (e.g. ‘Reading=Q<CR><LF>’). |
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SSi Manual SERIES | Page 61 of 61 |
