Control Messages Chapter Five: Remote RS-232 Operation
102
The command [Z 3] removes the sensor zero [Z 1] and the special zero [Z2 value]
correction factors stored in memory, and is used to determine the uncorrected signal from the
pressure transducer. Each time a sensor is zeroed, the offset changes and the pressure display is
updated. In some applications it may be important to keep the zero offset within a specific
range. There is no request associated with this function.
To remove the zero corrections, send the command:
Z 3
How To Zero the Analog Set Point
The command [Z 4] instructs the controller to take the current value of the external analog set
point for its zero value. Zeroing the analog set point allows you to correct any controller zero
offsets. There is no request associated with this function.
To zero the analog set point:
1. Apply zero input voltage to Interface connector pins 33 and 34. (Connect pin 34 to 35 to
properly ground.)
Refer to Table 8, page 22, for the Interface connector pinout.
2. Enter the command:
Z 4
The 651 controller learns the input voltage that corresponds to the analog set point zero
value.
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