Output Queue; Error Queue; Description Of Error Numbers - JGR TLS5 User Manual

transferred from the input buffer to the parser. This ensures that no bytes in
the program message are lost. However, the RS232C interface has no DAQ
signal and cannot be signaled when the input queue becomes full. Therefore,
characters sent to the TLS Source are lost.
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 query error bit is set. This error is also referred to as an unterminated error.

Output Queue

Responses to query messages are placed in the output queue. This queue is 128
characters in length. When a response is placed in the output queue, the MAV
bit in the status register is set. The MAV bit is cleared when the response is sent.
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 character in a response is sent.
If an attempt is made to read the output queue when it is empty and the
current program message does not contain a query, a query error bit is set.

Error Queue

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 read is always the first error that occurred.
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). Each error in the queue consists of an error number and a brief error
message.

Description of Error Numbers

0 No error
No error has occurred.
-100 Command error
A command error was detected, but the parser cannot be more specific.
TLS5-UM-00001 Rev 002
TLS5 User Manual
30