Control Functions
PSI BOX PLUS+ Reference
END=OFF.
Disable EOI During A Bus Write.
__________
_____________________________
Purpose.
Sets or changes the End Of Sequence terminator so
__________
that EOI is never sent true during the bus write routine.
This command is used to inform the PSI BOX of when to
set the EOI line true when writing data to the IEEE device.
This command prevents the EOI signal being set true when
the last byte in the current string is output.
The PSI BOX is instructed never to set EOI true.
This command is used mainly when a large stream of data is
being sent to the IEEE bus in several smaller chunks. it prevents
EOI being set early and so prevents the listener terminating the
bus handshake early.
Alternatively, using EOS=ON and EOS= the EOI signal
can be set when the last byte in the current string is output, or
EOI can be set true when a particular character, in the range 00-
255, is the last byte to be sent from the PSI BOX. The PSI
BOX can be instructed to compare all 8 bits of the character
written or just the 7 least significant bits.
Format.
_______
a) END=OFF
b) END=
;EOI never sent true during an IEEE bus write.
Params.
None.
_________
Returns.
None.
__________
Example.
________
_
BUS END=
BUS END=OFF
When no parameter is given or when END=OFF the PSI BOX NEVER
sets the EOI line true when writing data to the bus. This is of
use when sending a large data stream to the bus in several
chunks, so preventing the IEEE device from thinking that the
output has finished early.
Chapter 8
Page 99
