Chapter Six: RS-232 Communications Option
RS-232 Messages
91
If the transducer is open to the atmosphere and Torr is selected as the pressure units, the
response will be:
@020 760
ENTER
Example 3: How To Calibrate the Null Value
Calibrating the 670 instrument involves two Global commands. First, use the set mode (01)
command to select the calibration procedure. Second, issue the calibrate mode (03) command to
actually perform the calibration procedure.
Note
1. The remote zero feature requires an additional step. Refer to page 95
for an example explaining how to use the remote zero feature.
2. The time required to complete a calibration procedure depends on the
value of the averaging entry. Refer to Table 16, page 73, for more
information.
1. Use the set mode command to select the null calibration procedure:
@0102
ENTER
The 670 instrument will return the same command to indicate that the command was
accepted.
2. Send the calibrate mode (03) command to initiate the null calibration procedure:
@030
ENTER
The front panel will flash the message “
CALIBRATING
” during the null calibration
procedure. The system will send back the same command to indicate that the command
was accepted. It does not send notification when the calibration is complete.
3. Change the mode back to pressure by sending the command:
@0100
ENTER
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