Power In Connector; Power Out Connector; Usb Led; Pwr Led - Measurement Computing USB-PDISO8/40 User Manual

USB-PDISO8/40 User's Guide

POWER IN connector

The USB-PDISO8/40 requires between 6.5 V and 12.5 V of external power. An external power connection is
required to activate the relays and to run tests in InstaCal.
To supply external power, connect the
(CB-PWR-9).
The USB specification allows high-power devices to draw up to 725 mA. When all eight relays are energized,
the combined current draw exceeds the maximum allowed for high-power USB devices. Therefore, external
power is required.

POWER OUT connector

Use the
POWER OUT
external power supply. A user-supplied custom cable is required to daisy chain multiple devices.

USB LED

The LED indicates the communication status of the USB-PDISO8/40. This LED uses up to 5 mA of
USB
current and cannot be disabled. The following table explains the function of the USB LED.
USB LED
On steadily
Blinking

PWR LED

The USB-PDISO8/40 incorporates an onboard voltage supervisory circuit that monitors the USB VBUS (5 V)
and the external 9 V power supply. If the input voltage falls outside of the specified ranges the
off (see the following table).
PWR LED
On
Off

Signal I/O connector

The table below lists the device connectors, applicable cables, and compatible accessory boards.
Connector
Compatible cables
Compatible accessory products
using the C40FF-x cable
Compatible accessory products
using the C40-37F-x cable
POWER IN
connector to provide power to additional daisy chained MCC USB devices from a single
USB LED Indications
Indication
The USB-PDISO8/40 is connected to a computer or external USB hub.
Initial communication is established between the USB-PDISO8/40 and the computer, or data is
being transferred.
PWR LED Indications
Indication
USB +5 V power or +9 V external power is supplied to the USB-PDISO8/40.
Input power is not supplied, or a power fault has occurred. A power fault occurs when the input
power falls outside of the specified voltage range:
USB VBUS (+5 V): 4.75 V to 5.25 V

External power: (+9 V): 6.5 V to 12.5 V

Board connectors, cables, accessory equipment
P14: 40-pin ribbon connector
C40FF-x: 40-conductor ribbon cable, female both ends, x = length in feet.
C40-37F-x: 40-pin IDC to 37-pin female D connector, x = length in feet.
CIO-MINI40
CIO-MINI37
SCB-37
connector to the supplied +9 V external power supply
9
Functional Details
LED shuts
PWR