4. REMOTE OPERATION
Page 117
© 2007 DH Instruments, a Fluke Company
ZOFFSET:IH and ZOFFSET:IL (obsolete style)
Purpose
Read or set the AutoZ pressure offset (P
offset
) for the high (“IH”) or low (“IL”) RPT and current
measurement mode. Not recommended for new applications
Command
Query
“ZOFFSET:IH
offset
”
“ZOFFSET:IL
offset
”
“ZOFFSET:IH?”
“ZOFFSET:IL?”
Classic “ZOFFSET:IH
=
offset”
“ZOFFSET:IL
=
offset”
“ZOFFSET:IH”
“ZOFFSET:IL”
Defaults “ZOFFSET:IH
= 0.0”
“ZOFFSET:IL
= 0.0”
Arguments
offset:
The RPT pressure offset (“Poffset”) for the current measurement mode
(gauge or absolute) in Pa.
Remarks
The pressure offset (P
offset
) for the specified RPT (HI or Lo) in the current measurement mode
can be accessed with this program message. External RPTs’ P
offset
cannot be adjusted from
PPCH-G. There is a separate offset for gauge and absolute measurement modes. Using this
program message will overwrite the current offset, so caution must be used. Changes made
using this program message take effect immediately.
Example
(enhanced)
Cmd sent:
Reply:
“ZOFFSET:IL 32.1”
“ 32.10 Pa”
Example
(classic)
Sent:
Reply:
“ZOFFSET:IL=32.1”
“ 32.10 Pa”
Errors
ERR# 6:
One of the arguments is out of range.
See Also
3.5.1
4.5
STATUS REPORTING SYSTEM
The PPCH-G 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
PPCH-G 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 PPCH-G 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.
4.5.2
STATUS BYTE REGISTER
The PPCH-G contains an 8 bit Status Byte Register that reflects the general status of the PPCH-G.
Table 19.
8 Bit status byte register
OPER
(128)
RQS/MSS
(64)
ESB
(32)
MAV
(16)
N/A
(8)
ERROR
(4)
N/A
(2)
RSR
(1)
This register is affected by the PPCH-G reply output queue, the Error Queue, the Standard
Event Status register and the
Ready Event
Status register.
Status Byte Register
(“
∗
STB?” or ”
∗
SRE
n”)
