Problems with k8000 input

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1

in vb and delphi versions of test programm AD inputs are allways in 255, and not changing when i connecting 2 volts, 3 volts etc. if i connecting power supply to digital input 1 - led ld1 begins to light. But test programm does not indicate the state of input 1.
In dos turbo pascal: AD array allways 255,255,255 …

But all outputs are working correctly! DAC1-8, DA1 and IOs working fine for output… I used 3 computers with DOS and XP, used delphi and pascal, tried all test sofwtare but still no input from k8000…

What can be wrong???

ps/ plz sorry for my english 8)

2

Make sure you have mounted resistors RA and RB as indicated in manual.
If you did not mount these resistors, the inputs of the AD converter are floating, which results in a readout of ‘255’.
Also: check position of IC24, make sure it has not been inverted.

3

thank a lot! all just fine!
ic 24 was inverted!