4. REMOTE OPERATION
Page 61 © 1998 DH Instruments, Inc.
DP=
Purpose: Decrease the pressure a given amount using the slow speed.
Syntax:
“DP=n”
Arguments:
n The decrease in pressure desired (current pressure units). This can be from 0
to 2 % FS of the current transducer range.
Remarks: The slow speed will be used for a calculated amount of time (up to 5 seconds) to create the
desired change. The PPC2 AF will not attempt to control the pressure to a target, so the change
in pressure will be approximate.
Example: Command: “DP=10”
Reply: “10.00 kPa a”
Errors:
ERR# 6: The n argument is not within given limits.
See Also: None.
DS=
Purpose: Decrease the pressure slowly.
Syntax:
“DS=n”
Arguments:
n ‘0’ Closes the slow down valve.
‘1’ Opens the slow down valve.
Remarks: Opening the slow down valve will cause the pressure to decrease slowly.
Example: Command: “DS=1”
Reply: “DS=1”
Errors:
ERR# 6: The n argument is a ‘0’ or a ‘1’
See Also: 1.2.7
DRVn (=)
Purpose: Read or set the status of an external solenoid valve.
Syntax:
“DRVn=x”
“DRVn”
Arguments:
n The valve to operate on. This can be from 1 to 8.
x The state to change the valve to. ‘0’ to de-activate it. ‘1’ to activate it.
Remarks: The PPC2 AF can control up to eight external valves. Valve driver #8 is reserved for the external
SPLT valve.
Example: Command: “DRV3”
Reply: “DRV3=1”
Errors:
ERR# 6: The n or x arguments are not within given limits.
See Also: 3.3.4
ERR
Purpose: Read the last error message.
Syntax: “ERR”
Remarks: The “ERR” command finds out more details about an error that has occurred. If the user
receives an “ERR# nn” reply, the “ERR” command returns a brief description about the last error
number that was replied.
Example: Command: “ERR”
Reply: “Missing or improper command argument(s)”
See Also: 4.3.2
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