Keithley KPCI-PIO96 User Manual page 51

5-20 Troubleshooting
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12. Using the DIP switches on the PIO Control Panel, set ports A, B, and C to bit pattern 1, as
shown in Figure 5-12. Bit pattern 1 corresponds to a byte value of 55 in hexadecimal.
Figure 5-12
Port output settings, bit pattern 1
PORT A
7 6 5 4 3 2 1 0
n n n n
n n n n
On
PORT B
7 6 5 4 3 2 1 0
n n n n
n n n n
On
PORT C
7 6 5 4 3 2 1 0
n n n n
n n n n
On
NOTE Note that the bit is ON when the switch button is DOWN.
13. Click the 'Update All' button on the PIO Control Panel.
14. Measure the voltage between signal ground and each bit of ports A, B, and C with a DMM or
DVM or check the logic level for each bit of ports A, B, and C bit with a TTL logic probe.
Connect these instruments to the terminal accessory or ribbon cable that is connected to the
selected KPCI-PIO I/O connector.
Each bit set to ON in the PIO Control Panel should output a logic-high signal at the
corresponding I/O terminal, corresponding roughly to 4 volts at a DMM/DVM. Each bit set
to OFF in the PIO Control Panel should output a logic-low signal at the corresponding I/O
terminal, corresponding roughly to 0 volts at a DMM/DVM.
• If the bit patterns set on the PIO Control Panel do not agree with the logic levels measured
at the I/O terminals, the board is not functioning properly. Stop here, and return to the step
in the "General problem isolation procedure" where you were directed to do
I/O bit tests (step 17 or step 26e in the "General problem isolation procedure").
• If the bit patterns set on the PIO Control Panel agree with the logic levels measured at the
I/O terminals, then continue with step 15.
15. Using the DIP switches on the PIO Control Panel, set ports A, B, and C to the bit patterns
shown in Figure 5-13, which correspond to byte values of AA in hexadecimal.
KPCI-PIO96 User's Manual
&H55
&H55
&H55