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PROGRAMMING AND INTERFACING
Self-test
Q1 – Perform an instrument self test routine and report the device’s status. If the device passes the
self-test, a “Self Test Pass” message is put into the output buffer so that the next bus read will return
this condition. This command will also update the serial poll byte and SRQ status.
Hierarchy of GPIB Commands
The 1750 microprocessor is programmed to evaluate the command set on a priority basis up to the
command delimiter “X” as follows:
The “L” (limits), command is the only command that can have a conflicts error associated with it. If
the user attempts to set an upper limit on the comparator that is less than the lower limit or a lower
limit that exceeds the upper comparator limit a conflict error is generated. If a conflict error condition
is generated, the limits are not changed.
The “C” (recall setup), command supersedes all programming up to the next “X” (execute), command.
All commands following the “C” command will be ignored since the “C” command is defining a totally
new machine state. For example, in the command line, “C2R5X”, C2 calls for memory location #2 to
be restored into the 1750. The command R5 will be ignored since the C2 command already defines a
resistance range. If the presets in location #2 are to be restored with the newly defined resistance
range, R5, then the following line of code needs to be implemented, “C2XR5X”. This will recall setup
location 2 with resistance range R5.
To force a user defined priority of commands, the commands should be separated by a command line
delimiter, “X”. For example, to change the delay time then the resistance range, enter the following
string of characters: D123XR2X.
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