RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 84
Examples:
• IEEE-488 enhanced mode command series using query operator:
“*CLS?” (Clear the error queue. Wait for reply)
“UNIT? KPA” (Generates a reply. User must wait for reply before continuing)
“MMODE? A” (Generates a reply. User must wait for reply before continuing)
“PR?” (Generates a reply. User must wait for reply before continuing)
• IEEE-488 enhanced mode commands without query operator:
“*CLS” (Clear the error queue. No reply)
“UNIT KPA” (No reply)
“MMODE A” (No reply)
“ERR?” (Wait for reply. User should use “ERR?” query following a
series of non query commands to check for errors that may
have occurred)
• IEEE-488 enhanced mode multiple commands without query operator:
“*CLS” (Clear the error queue. No reply)
“UNIT KPA;MMODE A” (Two command at once. No reply)
“ERR?” (Wait for reply. User should use “ERR?”
query following a series of non query
commands to check for errors that may
have occurred)
• 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)
4.3.2.2 USING QUERY TYPE COMMANDS
The QUERY type of program message just requests data from the RPM4.
Placing the query operator “?” immediately after the command creates a query.
You must wait for a reply with a query. If you send any type of program
message to the RPM4 after a query before receiving a reply, the program
message is discarded and an error is generated. Errors are reported using the
IEEE Std. 488.2 status reporting model. A Query program message always ends
with a question mark. 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. Please note that
queries in enhanced mode via the IEEE-488 port that results in an error will not
result in a reply. You must check the error queue (use the “ERR” querie) to see
if an error has occurred.
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