PPCH-G™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 94
4.4.4
PROGRAM MESSAGE DESCRIPTIONS
#
Purpose
To allow the host PC to communicate with a device connected to the PPCH-G COM2
port.
Classic
“#xx”
Arguments
xx:
The string to send out of the COM2 port. It must be less than
40 characters long.
Remarks
The PPCH-G COM2 port can be used to communicate to another RS232 device (such as
another PPCH-G). This allows the user to use one COM port or IEEE-488 port on the
host computer to communicate with the PPCH-G and another device. A carriage return
and a line feed (
<CR><LF>
) are added to the string.
After this program message is issued, the PPCH-G will reply back any messages
received by the PPCH-G COM2 port that is terminated with a carriage return. Line feeds
are discarded. This will discontinue when the next program message is sent to the
PPCH-G.
There is no other reply from this program message. Prior to using this program message,
you must ensure that the PPCH-G COM2 port is correctly set up to communicate with the
device on COM2. Refer to the
“COM2=“
program message.
If the PPCH-G is using an external RPM4 as the active RPT, then this command should
not be used to interfere with the RPM4.
Example
(classic)
Sent:
Reply:
“#VER”
“DH INSTRUMENTS, INC PPCH-G si A20M Ver1.00 ”
This example assumes that a second PPCH-G’s COM1 port is connected to the PPCH-G
COM2 port. This example gets the version of the second PPCH-G.
See Also
“PASSTHRU”, “COM2”
3.5.2
COM2 is generally used for connecting DHI RPM4s to supply external measurement
devices in which case communications are handled automatically by the PPCH-G.
ABORT
Purpose
Stops active pressure generation/control. All control valves are closed.
Command
Classic
“ABORT”
“ABORT”
Remarks
This program message has no effect if the PPCH-G is not using automated pressure control.
When using automated pressure control, it aborts the control. This command is recommended
to idle the PPCH-G before setting a new target pressure. It can take several seconds for
open control valves to close.
Example
(enhanced)
Cmd sent:
Reply:
“ABORT”
“ABORT” (no reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Reply:
“ABORT?”
“ABORT”
Example
(classic)
Sent:
Reply:
“ABORT”
“ABORT”
See Also
3.3.10.5, 3.2.2
