Lantronix XPort Integration Manual - Pcb Interface
2 Description and Specifications
XPort™ Integration Guide
7
Figure 2-2 XPort Block Diagram
PCB Interface
The XPort has a serial port compatible with data rates up to 920 kbps (in high-
performance mode). The serial signals (pins 4–8) are 3.3V CMOS logic level, and 5V
tolerant. The serial interface pins include +3.3V, ground, and reset. The serial
signals usually connect to an internal device, such as a UART. For applications
requiring an external cable running with RS-232 or RS422/485 voltage levels, the
XPort must interface to a serial transceiver chip.
Table 2-1 PCB Interface Signals
Signal Name
XPort
Pin #
Primary Function
GND
1
Circuit ground
3.3V
2
+3.3V power in
Reset
3
External reset in
Data Out
4
Serial data out (driven by DSTni’s built-in UART)
Data In
5
Serial data in (read by DSTni’s built-in UART)
CP1/RTS
(Configurable Pin 1)
6
CP1 can be configured as follows:
•
Flow control: RTS (Request to Send) output driven
by DSTni’s built-in UART for connection to CTS of
attached device.
•
Programmable input/output: CP1 can be driven or
read through software control, independent of serial
port activity.