Chapter Six: RS-232 Communications Option
RS-232 Messages
93
Channel-Specific Messages (Continued)
Parameter Entry
Action
Data for a Command
Data for a
Request
17
Gain Range Mode
0 = x1
1 = x0.1
2 = x0.01
3 = Auto
‘?’
18
Enable Zero
0 = No (Off)
1 = Yes (On)
‘?’
19
Heater Current
Request Only
‘?’
Table 22: RS-232 Channel-Specific Messages
Example 1: How To Change the Pressure Units
To change the pressure units to psi on Channel 1, send the following command:
@1305
ENTER
The 670 instrument will return the same command to indicate that the command was
accepted.
Example 2: How To Set the Display and Remote Reading Resolution
To set the display and remote reading resolution to 4.5 digits on Channel 1, send the
command:
@1001
ENTER
The 670 instrument will return the same command to indicate that the command was
accepted. The pressure reading, reported by the 020 command, will be in 4.5 digits.
Example 3: How To Set the Sensor Full Scale Value
Use the following command to set the sensor full scale to 0.1 Torr on Channel 2 (assuming
that you have a 274 multiplexer connected to the 670 instrument):
@151.1
ENTER
The 670 instrument will return the same command to indicate that the command was
accepted. The pressure reading will now reflect the new sensor full scale range.
Note
The 670 instrument will accept fractional entries with or without the
leading zero. For example, you may enter either “@1510.1” or “@151.1”
as the full scale value.
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