Control Functions
PSI BOX PLUS+ Reference
SDC.
Sends Selective Device Clear Command.
_____
___________________________________
Purpose.
The addressed command Selective Device Clear is
__________
sent to the IEEE bus.
The SDC command is used to send the currently listening
devices to a device dependent state.
The PSI BOX asserts ATN and becomes the active
controller, then the IEEE command SDC, hex 04h decimal 4, is
sent over the IEEE bus. After the command has been sent the
ATN remains true, PSI BOX is the active controller.
The SDC command is used automatically in the CLEAR
routine but it can be called separately to perform your own
device clear routine. The SDC command can also be sent by
using CMD 4 or CMD 132
Format.
SDC
_________
Params.
None.
_________
Returns.
None.
__________
Example.
________
_
BUS SDC
Bus Activity.
___________
_
assert ATN if not already so
SDC
Chapter 8
Page 141
