This is a high speed USB UART and a genuine item should easily attain 460800 baud in Linux or even higher.

Transmit is labelled RXD and receive as TXD on this module.

This module uses a cp2102 device incorrectly wired with 4v4 on their output pins instead of 3v3. This module is totally unreliable at 460800 baud.

A source on the web explains that the RESET pin is incorrectly pulled high to VUSB.

There is lot going on here and none has been tested. A diagram exists explaining the switches.

Mode			Pin	Function
TTL Level Interface	TXD	TTL Transmit
TTL Level Interface	RXD	TTL Receive
TTL Level Interface	GND	TTL ground
232 Level Interface	232-TX	232 Transmit
232 Level Interface	232-RX	232 Receive
232 Level Interface	GND	232 Ground
485 Level Interface	A	485A+
485 Level Interface	B	485B-
+5V Voltage Output	+5V	+5V Voltage Output
3.3 Voltage Output	3V3	3.3V Voltage Output
DTR Output		DTR	Special Function
RTS Output		RTS	Special Function

KERNEL=="ttyUSB*",\
    ATTRS{idVendor}=="10c4",\
    ATTRS{idProduct}=="ea60",\
    ATTRS{serial}=="0001",\
    GROUP="dialout",\
    MODE="0660",\
    RUN+="/bin/ln -sf %k /dev/ttyCP2102"

/dev/serial/by-id/usb-Silicon_Labs_CP2102_USB_to_UART_Bridge_Controller_0001-if00-port0

Separate data I/O connections (only supported option)

BAITE Cp2102 module               PICMicro
===================               ========

3V3-------------------------------VDD

GND-------------------------------VSS

TX (RXD)--------------------------VPP

RTS-------------------------------PGC

DTR-----------1000R----------+----PGD
                             |
CTS--------------------------+

DEVICE=TTY
IFACE=/dev/ttyUSB0
SLEEP=0
BITRULES=0x001F

Data-sheet