Using the GPIB Command Set with the Model 2090
Model 2090 Multi-Device Controller
The
Output Queue
is the buffer which holds information
to be returned over the GPIB when a read command is
performed. As long as there is information in the Output
Queue, the MAV (Message Available) bit of the Status
Byte Register will be set.
This symbol represents a logical OR of all of the input bits.
As long as any one of the input bits is TRUE, the output
will be TRUE. If all of the input bits are FALSE, the
output will be FALSE.
These symbols represent a logical AND of the bits of the
two registers. If a given bit from both registers is TRUE
then the corresponding output is TRUE. If either bit is
FALSE then the output is FALSE.
The following section of program code and subroutines
illustrates the use of the GPIB status reporting system to
detect a number of error conditions on a standard tower.
Note the use of subroutines to create modified versions of
the commands "ibrd" and "ibwrt" which handle the
generation of a service request. This concept can be
extended to provide subroutines which handle service
requests from any GPIB call. There are also subroutines
for handling basic functions of the Model 2090. By
breaking up the program in this manner it is possible to
handle any condition with ease while at the same time
reducing the size of the program code.
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© ETS-Lindgren– April, 2006
Revision G– P# 399199
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