Pwr Led; 50-Pin Connectors; Pull-Up/Pull-Down Dip Switches; Signal Connections - Measurement Computing USB-DIO96H User Manual

USB-DIO96H User's Guide

PWR LED

The LED turns on when external power is supplied. The USB-DIO96H incorporates an onboard voltage
PWR
supervisory circuit that monitors the external power supply and disconnects power from the rest of the board
components if the external power supply voltage is too high or too low. The
power is not supplied to board components under the following circumstances:
when the input power falls below +4.1 V

when the input power goes above +5.6 V


50-pin connectors

The USB-DIO96H has four 50-pin connectors labeled
following connections:
24 digital I/O terminals:

P1 provides access to
o
o P2 provides access to
o
P3 provides access to
o P4 provides access to
25 ground terminals (

One power terminal (


Pull-up/pull-down DIP switches

Use the on-board DIP switches labeled
for each port. Each set of DIP switches includes four switches labeled 1 to 4. Switch 1 controls PORTA, switch
2 controls PORTB, switch 3 controls PORTCL, and switch 4 controls PORTCH.
Figure 5 shows the DIP switches used to configure Port 1.
All DIP switches are configured by default for pull-up (
position.
PD

Signal connections

The USB-DIO96H has four rows of screw terminals labeled
26 connections. The screw terminals provide the following connections:
96 digital I/O lines (

One external event counter input (

Three VDD power outputs (

Four ground terminals (

Use 14 AWG to 30 AWG wire for your signal connections. Each screw terminal is identified with a label on the
board and on the underside of the enclosure lid. Refer to the Screw terminal pinout table on page 12 for the
signal name associated with each board label.
Caution! Keep the length of stripped wire at a minimum to avoid a short to the enclosure! When connecting
your field wiring to the screw terminals, use the strip gage on the terminal strip, or strip to 5.5 mm
to 7.0 mm (0.215 in. to 0.275 in.) long.
FIRSTPORTA Bit 0
SECONDPORTA Bit 0
THIRDPORTA Bit 0
FOURTHPORTA Bit 0
)
GND
)
VDD
through
PORT 1
Figure 5. Pull-up/down switch configuration
to for Port 1 through Port 4)
A0 C7
)
CTR
)
5V
)
GND
PWR
through . Each 50-pin connector provides the
P1 P4
through
FIRSTPORTC Bit 7
through
SECONDPORTC Bit 7
through
THIRDPORTC Bit 7
through
FOURTHPORTC Bit 7
to configure the pull-up/down configuration
PORT 4
). To configure for pull-down slide the switch to the
PU
through
Port 1 Port 4
11
Functional Details
LED does not turn on, and
. Each row has