Usb out connector, Usb in connector, External power connectors – Measurement Computing USB-PDISO8 User Manual
Page 12: Usb led, Pwr led, Usb out connector -2, Usb in connector -2, External power connectors -2, Usb led -2, Pwr led -2
USB-PDISO8 User's Guide
Functional Details
USB OUT connector
The
USB OUT
connector is a downstream hub output port intended for use with other Measurement Computing
USB products only. The USB hub is self-powered, and can provide 100 mA maximum current at 5 V. The USB
out connector is labeled
USB OUT
on the enclosure and on the board.
For information on daisy chaining to other Measurement Computing USB products, refer to "
additional modules to the USB-PDISO8
USB IN connector
Connect the
USB IN
connector to the USB port on your computer (or USB hub connected to your computer).
The USB in connector is labeled
USB IN
on the enclosure and on the board.
External power connectors
The USB-PDISO8 has two external power connectors labeled
POWER IN
and
POWER OUT
on the enclosure.
The
POWER IN
connector is labeled
PWR IN
on the board, and the
POWER OUT
connector is labeled
PWR
OUT
on the board.
To supply external power, connect the
POWER IN
connector to the supplied +9 V external power supply (CB-
PWR-9).
The
POWER OUT
connector lets you power additional daisy chained Measurement Computing USB products
from a single external power supply. The C-MAPWR-x cable is available from MCC to connect additional
Measurement Computing USB products.
USB LED
The
USB
LED indicates the communication status of the USB-PDISO8. This LED uses up to 5 mA of current
and cannot be disabled.
explains the function of the USB LED.
Table 3-1. USB LED Illumination
USB LED
illumination
Indication
Steady green
The USB-PDISO8 is connected to a computer or external USB hub.
Blinks continuously
Initial communication is established between the USB-PDISO8 and the computer, or data is
being transferred.
PWR LED
The USB-PDISO8 incorporates an on-board voltage supervisory circuit that monitors the USB VBUS (5V) and
the external 9 V power supply. If the input voltage falls outside of the specified ranges the
PWR
LED shuts off
(see
).
Table 3-2. PWR LED Illumination
PWR LED
illumination
Indication
Steady green
USB +5 V power or +9 V external power is supplied to the USB-PDISO8.
Off
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
3-2