24 Feb
2007
24 Feb
'07
9:50 p.m.
Tony Duell wrote:
My guess, and it's only a guess, is that it works
something like this :
At power-up, if the 9815-mode line is asseeted, the plotter goes into
^^^^^^^^^
listen mode (the HPIB talk/listen modes can be
controlled from the
^^^^^^^^^^^ ^^^^
plotter's microcontroller, this is also used for
self-tests on the HPIB
interface, as it is on the 7245...). The 9815 talks and sends it data.
^^^^^ ^^^^^ ^^^^
If the poltter gets a command that should output data
(say a digitise
command), it goes into talk mode automatically and sends said data. The
^^^^ ^^^^ ^^^^^^^^^^^^^ ^^^^^ ^^^^
9815 side of things knows it's just sent such a
command and goes into
listen mode to recieve said data.
^^^^^^^^^^^ ^^^^^^^ ^^^^
Good for you, you've finally got it.
As I said previously: un-addressed talk/listen HPIB-style data transfer.