Measurement Computing USB-DIO96H - Manual (Page 11)

USB-DIO96H User's Guide Functional Details
11
Power source jumper JP2
The power source jumper is labeled JP2 on the board. Use this jumper to configure the USB-DIO96H to use
either the external power connector ( POWER IN ) or the Molex connector. Figure 4 shows the jumper in each
configuration mode.
Figure 4. JP2 configuration modes
USB LED
The USB LED indicates the communication status of the USB-DIO96H. It uses up to 5 mA of current and
cannot be disabled. The table below explains the behavior of the USB LED.
USB LED behavior
LED Illumination Indication
Steady green The USB-DIO96H is connected to a computer or external USB hub.
Continuous blink Initial communication is established between the device and the computer, or data is being
transferred.
PWR LED
The PWR LED illuminates when external power is supplied. The USB-DIO96H incorporates an on-board
voltage 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
PWR LED does not light,
and power is not supplied to board components under the following circumstances:
 when the input power falls below +4.13 V
 when the input power goes above +5.59 V
50-pin connectors
The USB-DIO96H has four 50-pin connectors labeled P1 through P4 . Each 50-pin connector provides the
following connections:
 24 digital I/O terminals:
o P1 provides access to FIRSTPORTA Bit 0 through FIRSTPORTC Bit 7
o P2 provides access to SECONDPORTA Bit 0 through SECONDPORTC Bit 7
o P3 provides access to THIRDPORTA Bit 0 through THIRDPORTC Bit 7
o P4 provides access to FOURTHPORTA Bit 0 through FOURTHPORTC Bit 7
 25 ground terminals (
GND )
 One power terminal (
VDD )
Pull-up/pull-down DIP switches
Use the on-board DIP switches labeled PORT 1 through PORT 4 to configure the pull-up/down configuration
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.