3.4 Fahrenheit Operation
The C4 can use either Celsius or Fahrenheit temperature scales. Celsius is the default mode. When the controller is operating in Celsius mode it’s behavior is identical to the model
To change the temperature scale, use SETUP mode (See Section 8) to access setup parameter F16. Select either of these field values:
0Celsius
1Fahrenheit
When in Fahrenheit mode, temperature displays have an “F” following the probe identifier on the left side of the display. Example:
p1f 102.4
Likewise, temperature inquires over the bus (PT command - See Section 7.5.7) will return a string with an “F” as the third byte in the string. The string will therefore be 1 byte longer than the string returned in Celsius mode. This difference was intentional as it requires a modification of the parsing routine that will assure that Celsius and Fahrenheit data are recognized properly. Thus, if the current probe 1 temperature is 86.7/F, the result of a Fahrenheit mode get temperature query for probe 1 (query command = PT1) would be
T1F 86.7<CR><LF>
If the temperature at probe 1 was 55.4/C, the same command in Celsius mode would return
T1 55.4<CR><LF>
During Remote mode operation, the C4 may be queried to determine the current temperature scale by using the QS, Query Setpoint, command. See Section 7.4.4.
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