Measurement-computing PCI-DIO24/LP Manual do Utilizador descarregar pdf (Página 13)

PCI-DIO24/LP User's Guide Functional Details

13

2.2 K SIP installed for pull-up

2.2 K SIP

Dot indicates the

common line

+5 VDC

HI

LO

(GND)

n7

User Connector

Digital I/O Lines

n5

n4

n3

n2

n1

n0

n6

COM

Digital

I/O Port

n = A, B, or C

+5 VDC

2.2 K SIP installed for pull-down

2.2 K SIP

Dot indicates the

common line

HI

LO

(GND)

n7

User Connector

Digital I/O Lines

n5

n4

n3

n2

n1

n0

n6

COM

Digital

I/O Port

n = A, B, or C

Figure 5. Pull-up and pull-down resistor SIP schematic

To pull up the digital lines for a particular port, install the resistor with the common pin at the HI end. To pull

down the digital lines for a particular port, install the resistor with the common pin at the LO end. When

installed, the SIP resistors establish either a high or low logic level for each port when the board is in input

mode.

Install MCC SIP packs

When installing pull-up and pull-down resistor SIP packs, we recommend using a 2.2 K, eight-resistor SIP

(MCC part number SP-K2.29C).

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