Output Queue; Error Queue; Description Of Error Numbers - JGR MBR5 User Manual

and cannot be signaled when the input queue becomes full. Therefore,
characters s ent t o t he M BR5 M eter a re l ost.
If a new program message is received before the response to a query in a
previous message is read, the output queue is cleared, MAV is set to false, and
the q uery e rror b it i s s et. T his e rror i s a lso r eferred t o a s a n u nterminated e rror.
Output Q ueue
Responses t o q uery m essages a re p laced i n t he o utput q ueue. T his q ueue i s 1 28
characters in length. When a response is placed in the output queue, the MAV
bit i n t he s tatus r egister i s s et. T he M AV b it i s c leared w hen t he r esponse i s s ent.
Response messages are always terminated with the sequence <LF> and, if the
response is being sent through the GPIB, the EOI signal is set to true when the
last c haracter i n a r esponse i s s ent.
If an attempt is made to read the output queue when it is empty and the
current p rogram m essage d oes n ot c ontain a q uery, a q uery e rror b it i s s et.
Error Q ueue
The error queue is where errors are placed and it can contain up to 10 error
messages. Because it is a FIFO queue, the error returned when the error queue
is r ead i s a lways t he f irst e rror t hat o ccurred.
If more than 10 errors are put in the error queue, an overflow error occurs and
the last error in the queue is overwritten with error number -­‐350 (Queue
Overflow). E ach e rror i n t he q ueue c onsists o f a n e rror n umber a nd a b rief e rror
message.

Description of Error Numbers

0 No e rror
No e rror h as o ccurred.
-­‐100 Command e rror
A c ommand e rror w as d etected, b ut t he p arser c annot b e m ore s pecific.
-­‐130 Suffix e rror
An error was detected in the suffix sent with the command, but the parser
cannot b e m ore s pecific.
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