READBACK STATUS examples

PIN  NOMINCLATURE    CH0   CH1   CH2   CH3              CH7   CH9
13   VA               0     5V    0     5V               5V    5V
25   VB               0     0     5V    5V               5V    0
24   VC               0     0     0     0                5V    0
23   VD               0     0     0     0                0     5V
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 CONTROL
300 OHMS ALMOSTS TOGGLES = 2.6V

THEREFOR THE IMPEDANCE IS ABOUT 300 OHMS.

300 OHMS WHEN COMMANDING. BUT INPUT WIRES BECOME OUTPUT FOR ABOUT
A QUARTER SECOND AFTER INPUTING COMMAND.  So wires must be driven
by diodes or relays. Commands into device must be devorced while the 
device wires become sourcers and sinkers.

PIN  NOMINCLATURE     SHORTLOW
21   NOT VA           CH1    
22   NOT VB           CH2
09   NOT VC           CH4
20   NOT VD           CH8
19   NOT STROBE       CH0