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Chapter 5 Remote Interface Reference
3488 Mode Commands
OLAP <0 | 1>
Suspends or releases the GPIB I/O communications.
In the Overlap disabled mode (default, OLAP 0), the 3499A/B/C holds up
GPIB I/O communications while it processes received messages.
When Overlap is enabled (OLAP 1), the 3499A/B/C will release the GPIB
as soon as the command message is received. Overlap enabled allows
faster I/O operations but does not guarantee sequential operation of
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other devices on the bus.
Overlap goes into effect on the first Bus communication after the OLAP
message sent.
Overlap only applies to commands received, not to data sent by the
3499A/B/C.
In Overlap enabled, you should monitor Bit 4 in the 3499A/B/C Status
Register to help insure sequential operation of other instruments on the
GPIB interface.
OLAP 1 is necessary for multiple readings from the digital I/O modules
with the DREAD and DBR commands.
5
Switching between OLAP 0 and OLAP 1 should have a minimum delay
time of 5 seconds before sending other commands.
OUTPUT 709; "OLAP 1"
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