Manual USB-DIO-48
12
USB Connector
The USB connector is a Type B high-retention type connector and mates with the cable
provided. The USB port provides communication signals along with +5 VDC power. The
board can be powered from the USB port or, if needed for higher source current
applications, an external power supply can be used.
Embedded USB Connector
Micro 5-pin header provides embedded devices with a compact USB interface.
LED
The LED on the front of the enclosure is used to indicate power and data transmissions.
When the LED is in an illuminated steady green state, this signifies that the board is
successfully connected to the computer and has been detected and configured by the
operating system. A continuously flashing LED signifies transmitted data over the USB.
DC Power Jack (Optional)
For high current applications when current sourced on outputs is anticipated to output more
than a USB port can provide (typically 500 mA). The DC jack has a 2.00mm post and is
designed to be used with the AC/DC regulated 5V external power supply shipped with this
option. To configure for use, switch the jumper located near the USB connector to VEXT
(please consult the option selection map for a visual reference).
-ST Screw Terminals for High Retention Ext. Power
Specify “-ST” when ordering the OEM version of this board to connect external power via
secure screw terminals instead of a non-retained DC jack. Strip your wires approximately
4mm and tin, then tighten the reg5 VDC source leads into the labeled terminals.
50 Pin Box Headers
The 50 pin box headers have standard 0.100" spacing between pins and are keyed to
prevent improper connections. It can be used with standard IDC type ribbon cables.
5V Resettable Fused Outputs
Two 0.5A resettable fuses each feed two I/O connectors at pin 49 used to power external
module racks or relay boards and such. If an over-current persists on a circuit protected by
a resettable fuse, it will open interrupting power to the circuit. Response time depends on
over-current level and ambient temperature, humidity, etc. The fuse will remain open until
the bi-metal elements cool sufficiently, at which time the circuit will be restored.
Pull-Up / Pull-Down Configuration Jumpers
One configuration jumper controls connector group 0 and another configuration jumper
controls connector group 1. The I/O lines are either pulled up to +5V via 10K
Ω
(for dry-
contact monitoring) or pulled down (for positive control logic applications). When no
jumpers are installed, the lines are left floating, however due to the 10K resistor packs any
un-used input will not have suppressed cross-talk. For pull-ups (most common), install these
jumpers in the +5V position. For pull-downs, install these jumpers in the GND position. For
neither, remove these jumpers.
