DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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4. REMOTE OPERATION
Page 75 © 2009 DH Instruments, a Fluke Company
4.3.2 Error Queue
The RPM4-E-DWT keeps track of remote errors by using an error queue. If an error occurs,
the reply to the offending command will be “ERR#nn” where nn is the error code from 0 to 99.
The text description of the error is pushed onto the Error Queue. You should always check
the reply for an error and handle as needed. 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
Examples:
•
COM1 enhanced mode command:
“*CLS” or “*CLS?” (Clear the error queue. Wait for reply)
“UNIT KPA” or “UNIT? KPA” (Generates a reply. User must wait for reply
before continuing)
“MMODE A” or “MMODE? A” (Generates a reply. User must wait for reply
before continuing)
“PR” or “PR?” (Generates a reply. User must wait for reply before continuing)
4.3.2.1 Using Query Type Commands
The QUERY type of program message just requests data from the
RPM4-E-DWT.
Placing the query operator
“?” immediately after the command is optional. All
commands generate a reply that you must wait for and receive before sending
the next command. Most queries return a reply within 200 ms except:
“PR?”, “PRR?”, “SR?”, “ATM?”, “RATE?”: Up to 2 seconds.
“RPT”, “ARANGE”, “AUTOZERO RUN”: Up to 3 seconds
The syntax for using a QUERY program message is listed next to the keyword
“Query:” in each program message summary in Section 4.4.4.