Routing Multiple Devices
You can change two ormore
of
the I/O routes.
To
do this, you perform the routing
Steps 1through 4 oncefor each change you wish to make. However, to get the
desired result, you must do the changes
in the correct order!
If
you use one device
as the
source
of
a route, you should not lateron use the same device as a
destination.
Here's
why:
Afteryou route device
A to device B, device A is now logically equivalent to device
B. Therefore:
(1) Route A to B
(2) Route C to A
Does not allow C to outputto device A. Output to cwill actually transfer to
B,
just as
if
you had executed these steps:
(1) Route A to B
(2) Route c to B
On the otherhand:
(1) Route C to A
(2) Route A to B
Does allow device C to output to device A and device A to output to device B.
Forexample, suppose you want to route display outputto the printer, and printer
outputto the
RS-232-C.
Here's
a diagram
of
what you want to accomplish:
Display
Output
Printer
---------~
......
/output
RS·232·C
/'
Output
Display outputgoes to the Printer, and Printer output goes to the
RS-232-C. All other
I/O routes are unchanged. Note that Display outputdoes notget carried forward
from the Printerto the
RS-232-C.
To
accomplish the routing pictured above, use this
sequence:
1.
Route DO to PR
2. Route PR to RO
If
you mistakenly do the steps in reverse order, you will get this result:
Display
-------,
Output
Printer
I
/Output
RS·232·C /
Output
In this case, Display output is
"carried
forward" from the printer to the RS-232-C.
It
does notoutputto the printer.
9/3
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