DH Instruments PPC4, Руководство по эксплуатации и обслуживанию

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6. REMOTE OPERATION
Page 175 © 2009 DH Instruments, a Fluke Company
ZOFFSET:IH and ZOFFSET:IL
Purpose Read or set the AutoZ pressure offset (P
offset
) for the high (“IH”) or low (“IL”) Q-RPT and
current measurement mode. New designs should use the “ZOFFSET n ” command.
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 Q-RPT pressure offset (“Poffset”) for the current measurement mode
(gauge or absolute) in Pa.
Remarks The pressure offset (P
offset
) for the specified Q-RPT (Hi or Lo) in the current measurement
mode can be accessed with this program message. External Q-RPTs’ P
offset
cannot be adjusted
from PPC4. 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:
Query reply:
“ZOFFSET:IL 2.1”
“ 2.10 Pa”
Example
(classic)
Sent:
Reply:
“ZOFFSET:IL=2.1”
“ 2.10 Pa”
Errors ERR# 6: One of the arguments is out of range.
See Also 3.2.22
6.6 Status Reporting System
The PPC4 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 PPC4 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.
6.6.1 Error Queue
The PPC4 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.
6.6.2 Status Byte Register
The PPC4 contains an 8 bit Status Byte Register that reflects the general status of the PPC4.
Table 23. 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 PPC4 reply output queue, the Error Queue, the Standard Event
Status register and the
Ready Event Status register.