Further, a number of other RS-232C lines are available on the board using
the standard
serial
I/O cable
mentioned
above.
These are both input and
output lines, but they are not connected to anythin3 other than pads on the
board,
nor
are drivers
and receivers connected to them.
Including all the
lines mentioned previously, the RS-232C
lines
which
are
available
on the
board
for each
of the three
serial
channels
using
a standard serial I/O
cable are 1 to
a
and 14 to 21.
Table 3 in Section 2.5 lists
the
functions
of each of these lines.
Any RS-232C line can be connected to +12
VOC
on the board.
In addi tion,
for each
channel,
the 8251
can be used
to monitor
in software
anyone
RS-232C handshaking
line, and the 8251 can be used to control from software
the output
of any
two RS-232C
handshaking
lines,
and lastly, the 8251's
transmitter
can be disabled
or enabled
by
anyone
RS-232C
incoming
handshaking line.
There is one spare RS-232C receiver and one spare RS-232C
driver available on the board which can be used to connect one input and one
output
handshaking
line.
There
are
two spare slots on the board for any
additionally required receivers or drivers.
For the large majority of applications, no additional RS-232C lines will
be required other than those already connected to active components
on
the
Bitstreamer
II board,
(connected
either
to drivers,
receivers or +12V).
Thus the serial channels can very often be used as OCE RS-232C input/output
channels without modification.
Most serial printers, and terminals,
can be
connected with little or no difficulty.
To connect
to a modem,
acoustic
coupler,
or
other
kind
of
Data
Communications
Equipment,
a serial
channel
must
be converted into a DTE
RS-232C channel.
This
can
either
be done
by changing
the board
wiring
slightly, as described in Section 2.4, or by attaching a Vector Graphic Null
Modem
Cable
to the external
08-25,
which
accomplishes
the same
thing.
However,
if RS-232C
handshaking is required, other than a co12 VDC
on certain
lines,
then
additional
modifications
to the board
will
be
necessary as explained in Section 2.5.
Of course, software is necessary
in order
to operate
specific
devices
connected
to specific
serial
channels.
Toe three serial channels on ~~e
aitstreamer II bqard are called IISerialChannel ;\," IISerialChannel
B, II and
"Serial Channel C."
Table 2 gives the correspondence between these channels
and specific machine language I/O addresses.
Other
documents
from Vector
Graphic
describe
the particular I/O addresses and peripheral devices which
each Vector Graphic software product controls.
Summary of Contents for Bitstreamer II
Page 1: ...lit t tiCAli1iC I JI U E I mAnUAL...
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