PSI BOX PLUS+ Reference
Control Functions
MSA.
Sends My Secondary Address.
_____
__________________________
Purpose.
The Secondary Address of the PSI BOX device is
__________
sent to the bus.
The MSA command is used after a MLA or a MTA to tell
all the bus devices that the PSI BOX controller is listening or
talking on the bus using a secondary address. Secondary
addresses are used to tell the device that a special feature is
being accessed by the user. You will have to supply your own
special features for the PSI BOX secondary addresses.
The MSA should only be sent immediately after a MTA or
MLA command. PSI BOX asserts ATN and becomes the active
controller, then the secondary 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 MSA command is usually as part of your own data
exchange routines.
Format.
MSA
_________
Params.
None.
_________
Returns.
None.
__________
Example.
________
_
BUS MSA
Bus Activity.
___________
_
assert ATN if not already so
SEC 0 if the PSI BOX sec add has been set to 0
Default is none.
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Chapter 8
