DH Instruments PPC4, Operation And Maintenance Manual

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6. REMOTE OPERATION
Page 149 © 2009 DH Instruments, a Fluke Company
DP
Purpose Decrease the pressure slowly a given amount using the slow speed.
Command “DP n ”
Classic
“DP= n ”
Arguments n: The decrease in pressure desired (current pressure units). This can be from
0 to 2 % FS of the active range.
Remarks The slow speed will be used for a calculated amount of time (up to 5 seconds) to create the desired
change. The PPC4 will not attempt to control the pressure to a target, so the change in pressure
will be approximate. This is the equivalent of using

.
Example
(enhanced)
Cmd sent:
Reply:
“DP 2”
“2.000 kPa” (no reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Reply:
“DP? 2”
“2.000 kPa”
Example
(classic)
Sent:
Reply:
“DP=2”
“2.000 kPa”
Errors ERR# 6:
The n argument is not within given limits.
See Also “IP”, “DS”, “IS”, “DF”, “IF”
3.2.1
DRVn
Purpose Read or set the status of external electrical drivers.
Command
Query
“DRV n x ”
“DRV n ?”
Classic “DRV n=x ”
“DRV n ”
Arguments n:
x:
The driver to operate. This can be from 1 to 8.
The state to change the driver to; ‘0’ to de-activate it, ‘1’ to activate it.
Remarks The PPC4 control has eight optional external drivers. Driver is used by the optional Purge
function.
Example
(enhanced)
Cmd sent:
Query reply:
“DRV1 1”
“1” (No reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Query reply:
“DRV2? 1”
“1”
Example
(classic)
Sent:
Reply:
“DRV1=1”
“DRV1=1”
Errors ERR# 6:
The n or x arguments are not within given limits.
See Also 3.2.23
DS
Purpose Decrease the pressure slowly.
Command “DS n ”
Classic “DS= n ”
Arguments n: ‘0’ Closes the slow down valve.
‘1’ Opens the slow down valve.
Remarks Opening the slow down valve causes the pressure to decrease slowly.
Example
(Enhanced)
Cmd sent:
Reply:
“DS 1”
“1” (no reply if IEEE-488)
Example
(Enhanced)
Cmd sent:
Reply:
“DS? 1”
“1”
Example
(Classic)
Sent:
Reply:
“DS=1”
“DS=1”
Errors ERR# 6:
The n argument is a ‘0’ or a ‘1’.
See Also “IS”, “DF”, “IF”, “DP, “IP”
Figure 31