Lantronix XPort Pro LX6 XPort Pro - Integration Guide - Page 8

PCB Interface, Table 2-2 PCB Interface Signals

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2: Description and Specifications PCB Interface The XPort Pro has a serial port compatible with data rates up to 921600 bps. The serial signals (pins 4-8) are 3.3V CMOS logic level. The serial interface pins include +3.3V, ground, and reset. The serial signals connect to an internal UART driven at 3.3V. For applications requiring an external cable running with RS-232 or RS422/485 voltage levels, the XPort Pro must interface to a serial transceiver chip. We supply an RS-232 transceiver on the XPort Universal Demo Board for this purpose. Note: The standard baud rate of 460800 bps is not supported. Signal Name Table 2-2 PCB Interface Signals XPort Pro Primary Function Pin # GND 3.3V Reset Data Out1 Data In CP1/RTS (Configurable Pin 1) 1 Circuit ground 2 +3.3V power in 3 External reset in 4 Serial data out (driven by built-in UART) 5 Serial data in (input to built-in UART) 6 CP1 can be configured as follows: • Flow control: RTS (Request to Send) output driven by the 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. • RS485 Transmit Enable: In RS485 mode, CP1 is driven by the built-in UART for connection to the transmit enable pin of an RS485 Transceiver. CP2/DTR (Configurable Pin 2) CP3/CTS/DCD (Configurable Pin 3) 7 CP2 can be configured as follows: • Modem control: DTR (Data Terminal Ready) output driven by the built-in UART for connection to DCD of attached device. • Programmable input/output: CP2 can be driven or read through software control, independent of serial port activity. 8 CP3 can be configured as follows: • Flow control: CTS (Clear to Send) input read by the built-in UART for connection to RTS of attached device. • Modem control: DCD (Data Carrier Detect) input read by the built-in UART for connection to DTR of attached device. • Programmable input/output: CP3 can be driven or read through software control, independent of serial port activity. 1 Data out will float during and immediately after power up or assertion of RESET on Pin 3. Pin 4 can be pulled up to +3.3V with a 10K ohm or larger resistor to hold the pin high during reset. XPort Pro Integration Guide 8

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2: Description
and Specifications
XPort Pro Integration Guide
8
PCB Interface
The XPort Pro has a serial port compatible with data rates up to 921600 bps. The
serial signals (pins 4–8) are 3.3V CMOS logic level. The serial interface pins include
+3.3V, ground, and reset. The serial signals connect to an internal UART driven at
3.3V. For applications requiring an external cable running with RS-232 or RS422/485
voltage levels, the XPort Pro must interface to a serial transceiver chip. We supply an
RS-232 transceiver on the XPort Universal Demo Board for this purpose.
Note:
The standard baud rate of 460800 bps is not supported.
Table 2-2 PCB Interface Signals
Signal Name
XPort Pro
Pin #
Primary Function
GND
1
Circuit ground
3.3V
2
+3.3V power in
Reset
3
External reset in
Data Out
1
4
Serial data out (driven by built-in UART)
Data In
5
Serial data in (input to built-in UART)
CP1/RTS
(Configurable Pin 1)
6
CP1 can be configured as follows:
•
Flow control
: RTS (Request to Send)
output
driven
by the 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.
•
RS485 Transmit Enable:
In RS485 mode, CP1 is
driven by the built-in UART for connection to the
transmit enable pin of an RS485 Transceiver.
CP2/DTR
(Configurable Pin 2)
7
CP2 can be configured as follows:
•
Modem control
: DTR (Data Terminal Ready)
output
driven by the built-in UART for connection to
DCD of attached device.
•
Programmable input/output
: CP2 can be driven or
read through software control, independent of serial
port activity.
CP3/CTS/DCD
(Configurable Pin 3)
8
CP3 can be configured as follows:
•
Flow control
: CTS (Clear to Send) input read by
the built-in UART for connection to RTS of attached
device.
•
Modem control
: DCD (Data Carrier Detect)
input
read by the built-in UART for connection to DTR of
attached device.
•
Programmable input/output
: CP3 can be driven or
read through software control, independent of serial
port activity.
1
Data out will float during and immediately after power up or assertion of RESET on Pin 3.
Pin 4 can be pulled
up to +3.3V with a 10K ohm or larger resistor to hold the pin high during reset.