PSI BOX PLUS+ Reference
Control Functions
MTA.
Sends My Talk Address.
______
_____________________
Purpose.
The Talk Address of the PSI BOX device is sent to
__________
the bus.
The MTA command is used to tell all the bus devices that
the PSI BOX controller is the talker, the source of the data, in
the next data transfer sequence.
The listener on the bus will accept data from the PSI
BOX. Since only one talker can be active on the bus at a time
this command automatically UNTalks any other talkers.
The PSI BOX asserts ATN and becomes the active
controller, then the Talk address of the PSI BOX is sent over the
IEEE bus. After the command has been sent the ATN remains
true, PSI BOX is the active controller.
The MTA command is usually used when to initiate your own
data exchange routines.
Format.
MTA
_________
Params.
None.
_________
Returns.
None.
__________
Example.
________
_
BUS MTA
Bus Activity.
___________
_
assert ATN if not already so
TAD 0 the default talk address of the PSI BOX
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Chapter 8
