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Page 111
© 2011 Fluke Calibration
OPERATION
To set up or verify PG9000’s COM2 port to communicate with an external vacuum
gauge, press
[SPECIAL]
and select
<5remote>
,
<2COM2>
,
<3vac>
. Select
<1RPMx>
if the external vacuum gauge is a DH Instruments RPM. Select
<2user>
to set up communications with a vacuum gauge other than a DH Instruments
RPM.
Select
<3dflts>
to set COM2 settings, measurement request string and conversion
coefficient to support the standard vacuum gauge supplied with the PG9000 vacuum
reference hardware.
Note
Setting Up for User Vacuum Gauge Communications
For an external vacuum gauge to be able to be used for
automated reference vacuum readings on PG7601 COM2 or a
DH Instruments RPM’s COM2, the following requirements apply
to the remote vacuum gauge’s communications:
•
Replies to a request to send string within 2 seconds.
•
Accepts <CR, LF> terminators.
•
Supplies <CR> or <CR, LF> terminators.
•
Request to send string must be printable alphanumeric
(no control modes or nulls).
After pressing
[SPECIAL]
and selecting
<5remote>
,
<2COM2>
,
<3vac>
,
<2user>
,
the display is:
COM2 meas req string
The measurement request string value is entered on the second line. It may have up
to 20 characters. When the string screen is opened, the cursor is on the first
character. Numerical values can be entered directly from the keypad. In addition,
the
[
←
]
and
[
→
]
keys can be used to toggle through a list of available alpha numeric
characters. Holding the key steps through the characters. Character order going up
(
[
→
])
is:
blank space, symbols, lower case letters, upper case letters, numbers
.
Press
[ENT]
to select a character and move to the next character. When a character
is selected the cursor moves to the next character. To leave a character blank, press
[ENT]
with the field for that character blank. After the last character has been
entered, press
[ESC]
. This causes a
<Save edits?>
screen to appear. Select
<2yes>
to save the edited string and move to the next screen. Select
<1no>
abandon the edits. Also, if
[ENT]
is pressed on the 20
th
character, the string is saved
automatically and operation advances to the next screen.
Note
The external vacuum gauge parameters including the
communication string can also be set by remote command which
is more convenient than front panel entry (see Section 4.3.4.2,
“UDV” command). By default the external vacuum gauge
parameters are preset to match the standard external vacuum
gauge supplied with the PG9000 vacuum reference hardware.
After the string value has been entered
the display is:
Reply conv coef:
1.000000 Pa/unit
<conv coef>
is the conversion coefficient that PG9000 will use to convert
readings from the external vacuum gauge to the pressure unit of measure
Pascal
[Pa]
. If the readings from the external vacuum gauge are NOT Pascal,
edit the conversion coefficient value as needed to convert the readings to Pascal.
When the conversion coefficient is entered
the next setup screen is opened. The
display is:
Leading characters to
Strip: 0
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