3: Evaluation Kit
XPort AR Integration Guide
19
Major Components
The major components of the evaluation board include:
XPort AR
Power Switch
Reset Switch
Headers
Disconnect Jumpers
LEDs
Test Switches
Prototyping Area
RS-232 Serial Ports
PoE Socket
Ground Turret
Power Input Connector
XPort AR
The XPort AR is placed in the upper left corner of the evaluation board and is referenced as
J1.
Note:
The footprint used for J1 on the evaluation board is compatible with both the
XPort AR and the original Lantronix XPort.
Power Switch
The two positions of the power switch are On and Off/PoE. In the On position, the evaluation
board gets its power from the 3.3 VDC input jack. In the Off/PoE position, the evaluation
board uses 3.3 VDC from the PoE socket S1 (if a circuit is attached that makes it available).
This provides a convenient On/Off switch in either case.
Reset Switch
The reset switch grounds the reset pin on the XPort AR. The XPort AR reset pin is an input-
only pin and connects to an 811-type reset IC. Internal to the 811 is a 20k pull-up and is the
only influence the XPort AR has on the reset pin.
Headers
The headers provide access to all of the XPort AR signals, as well as to circuits for I/O control
and monitoring.
JP1: Signal Access Header
This header provides access to each XPort AR signal. Use these pins to monitor activity with
an oscilloscope or to jumper to one of the four monitoring LEDs. When a CP is configured as
an input, it can be connected with a jumper to GND, a pull-up, or switch with pull-up and
switchable ground contact.
Note:
Typically, after booting up CP pins are in an unstable state for a few seconds.
However, the state of the CP pins in the XPort-AR is initially high-impedance, suitable
for an input. To use a CP pin as an output, the pin may be biased high or low with a
resistor to +V or ground so it will be "defined" as either 1 or 0 during this initial time.
