DH Instruments PPC Посібник користувача - Сторінка 8

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After the interface selection has been made, the terminal program will search for the PPC. If one of
the serial interfaces is selected as the communication port, the terminal program will search for the
PPC at different baud rates from 9 600 to 300. If the IEEE interface is selected, the program will first
ensure that an IEEE card is installed in the computer, then search all available addresses from 1 to
30 attempting to establish communications with the PPC.
Once the program locates the PPC, the remote light on the PPC will come ON and the screen should
fill with the returned data. The terminal program will now be monitoring the current pressure in
the PPC. If communication with the PPC is not established, check your RS232 cable pin-outs. If
your PPC has an IEEE interface, be sure that the interface selector switch on the back of the PPC is
set to the proper position.
1.2.1

OPERATION

The top part of the screen contains the most common parameters used for
pressure generation. See Figure 1. These parameters can be easily changed by pressing
the appropriate highlighted key and entering the required data. The actual data is the only
parameter that has to be entered. The terminal program will send out the corresponding
command in the proper format. When setting any of these parameters, a message will be
displayed in the current pressure window to indicate what is being changed. Table 1 lists
these parameters along with the related KEY PRESS and the actual command that it
corresponds to.
PPC COMMUNICATIONS TERMINAL
Copyright DH INSTRUMENTS
Range
:
Device
:
Hold
:
Vacuum
:
Target Pressure
current pressure
Generation Mode
Remote command
reply
status: Idle
<ESC> to EXIT
©2000 DH Instruments, Inc.
6000 psi
PPC
25.000
Target
No
Max P
:
0.000 psi
:
R
: Static
:
:
Figure 1. PPC Communication Terminal Screen
Page 2
PPC Communication Software User's Manual
:
0.050
:
6000.000
*
-1.560 psi
min pres.
max pres.
Hold Off
# of Inc.
Ret to a.
dwell
Execute
Version 3.00
April 1995
Interface :
COM1
Stability
:
0.120
Units
: psi
- pressure Array -
:
:
:
:
:
Continue
baud: 2400