PSI BOX PLUS+ Reference
Control Functions
LISTEN.
Sends The Listen Address.
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Purpose.
The listen address is sent to the IEEE bus.
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The LISTEN command is used to send a listen address in
the range 0 to 30 to the bus devices.
The PSI BOX asserts ATN and becomes the active
controller, then the number entered by the user is ORed with hex
020h, 32 decimal, and is sent over the IEEE bus. After the
command has been sent the ATN remains true, PSI BOX is the
active controller.
The LISTEN is used to instruct one or more bus devices
that they should listen to the addressed commands or data that
follows the listen command. The LISTEN command can also be
sent by using CMD 32-62 or CMD 160-190 or by using LAG 0-
30 or 128-158
Format.
LISTEN 1
Tell device 1 to listen.
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LISTEN 1,3,4
Devices 1, 3 and 4 to listen.
LISTEN 1+2,3,4 Device 1 Secondary address 2, and
devices 3 and 4 told to listen.
Params.
One or more parameters each in the range 0-30 or
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128 to 158.
An optional secondary address can be specified for
each primary address by using +sa after the primary
address. The sa is also in the range 0-30.
Returns.
None.
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Example.
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BUS LISTEN 1,3,4
Tell devices 1, 3 and 4 all to listen.
Bus Activity.
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_
assert ATN if not already so
LAG 1
LAG 3
LAG 4
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Chapter 8
