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Appendix B
D395-90-880 Issue E
Appendix B RS232 Commands
In the lists that follow:
x refers to gauge channel and is in the range 1..2
y refers to a single digit number
pressure is in exponential format which must be m.mEsee where m is the mantissa with 1 decimal place,
s the sign (+ or -) and e is the exponent (2 digits).
!CH x=pressure
Set the set-point high threshold for relay x as a pressure using the currently selected units. If you set the threshold
to a pressure which cannot be measured by the gauge which you are using then the set point will not operate.
Example: !CH2=1.3E-03
!CL x=pressure
Set the set-point low threshold for relay x as a pressure using the currently selected units. If you set the threshold
to a pressure which cannot be measured by the gauge which you are using then the set point will not operate.
Example: !CL1=1.0E+01
!GA x
Accept an error being reported for the gauge channel x. This is equivalent to pressing the ENTER key ( ) on the
front panel to clear an error message. If the error originated in a gauge it may be necessary to disconnect the gauge
and correct the fault before the error message can be cleared.
Example: !GA1
!GW x=y
Turn the gauge on channel x to on or off. If the gauge type cannot be switched on and off (for example APG), then
an error message is returned. The value of y is 0 = off, 1 = on.
Example: !GW2=1
!RCx=y
Set relay control for relay x to gauge y. Only relay 2 can be configured, any other value will produce an error message.
The set-point thresholds for relay 2 aare configured using !CH2 and !CL2 even if the relay is controlled by gauge 1.
Example: !RC2=1
!TH=pressure
Set the link high threshold as a pressure using the currently selected units. If you set the threshold to a pressure
which cannot be measured by the gauge which you are using then the link will not operate.
Example: !TH=1.3E03
!TL=pressure
Set the link low threshold as a pressure using the currently selected units. If you set the threshold to a pressure
which cannot be measured by the gauge which you are using then the link will not operate.
Example: !TL=1.0E-03
!USy
Set the pressure units. The value of y is:
0 = volts
1 = mbar
2 = Pa
3 = Torr
Example: !US2
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