DH Instruments PPC2+, Manual

Page: 124 / 166

PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 116
ZNATERRn:HI and ZNATERRn:LO
Purpose Read or set the autozero natural error (ZNATERR) for the selected RPT range and
measurement mode.
Command
Query
“ZNATERR n:HI NatErr, Date”
“ZNATERR
n:LO NatErr, Date”
“ZNATERR n:HI?”
“ZNATERR n:LO?”
Classic “ZNATERR n:HI =NatErr, Date”
“ZNATERR n:LO =NatErr, Date”
“ZNATERR n:HI”
“ZNATERR n:LO”
Defaults “ZNATERR n:HI = 0.0, 800101”
“ZNATERR n:LO = 0.0, 800101”
Arguments n: The RPT range. ‘1’ for the low, ‘2’ for the medium ‘3’ for the high
range of the selected RPT.
NatErr:
The RPT natural error for the RPT range.
Date: The date when the last edit to the NatErr was made.”.
Remarks The natural error (ZNATERR) for the specified RPT (HI or LO pressure) and RPT
range (1, 2, or 3) can be accessed with this program message. Using this program
message will overwrite the current natural error, so caution must be used. Changes
made using this program message will take effect immediately.
Example
(enhanced)
Cmd sent:
Query reply:
“ZNATERR1:LO 10, 961201”
“ 10.00 Paa, 961201”
Example
(classic)
Sent:
Reply:
“ZNATERR1:LO=10, 961201”
“ 10.00 Paa, 961201”
Errors ERR# 6: One of the arguments are out of range.
See Also Sections 3.4.1, 5.2.6
4 . 5 S T A T U S R E P O R T I N G S Y S T E M
The PPC2+ status reporting system is used to track and report system status and errors. It follows the
model of the IEEE Std 488.2 and works for the COM1 and the IEEE-488 port with slight differences.
The PPC2+ can be programmed to respond to various status conditions by asserting the SRQ of the
IEEE-488 interface. The COM1 port cannot be supported in such a way, so polling must be used.
4.5.1 ERROR QUEUE
The PPC2+ keeps track of remote errors by using an error queue. If an error occurs, it is
pushed onto the Error Queue. If you are using the COM1 port, the error number is
immediately replied in the form “ERR#
nn
where
nn
is the error code from 0 to 99.
The “ERR?” (or “ERR”) query can then be used to pull the error from the Error Queue in it’s
descriptive text format. If you are using the enhanced program message format, the Error
Queue will accumulate errors until full unless they are pulled from the queue. If you are using
the classic program format, the Error Queue is cleared every time a new program message
is received.