Switch
10k
Ω
+5V
PIO-96J Board
Digital
Input
#n
Digital
Common
GND
Onboard Pull-up
Resistor
PIO-96J-26636
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
(440) 248-0400
Fax: (440) 248-6168
www.keithley.com
Board Configuration
Description
This document contains information on the PIO-96J-26636 Parallel
Digital I/O Board. The PIO-96J-26636 is the standard PIO-96J with
RN1-12 populated with 10k Ω resistor networks (Keithley p/n 09698).
The onboard 10k Ω pull-up resistors are connected between each channel
and the +5V. This prevents a floating input when a contact is open and
gives CMOS compatibility for TTL signals. Replacement resistors,
p/n 09698, can be ordered from Keithley. Figure 1 shows how this resistor makes an input of a PIO-96J-26636 board an effective circuit for
monitoring contact closure. See Figure 1 for resistor connections. Refer
to the PIO-96J User’s manual for all other information concerning the
PIO-96J-26636.
Figure 1
Contact-closure monitoring at an input of a
PIO-96J-26636 board
Switch
Digital
Common
GND
10k
Digital
Input
#n
+5V
Onboard Pull-up
Ω
Resistor
PIO-96J Board
PA-827 Rev. A / 01-02 PA-827 Rev. A / 01-02