Full-speed USB device interface, compatible with USB V2.0, standard USB-A male design;
The computer is powered by USB directly, emulating a standard serial port, which is used to upgrade the original serial peripheral devices, or add additional serial ports through USB;
Support 3.3V and 5V TTL target systems, the serial port applications under the Windows operating system on the computer side are fully compatible without modification;
Support 5, 6, 7 or 8 data bits, support odd parity, even parity, blank, flag and no parity;
Support serial port sending enable, serial port receiving ready and other transmission rate control signals and MODEM contact signals;
Provide RS232, RS485 and other interfaces by adding a level conversion module;
Perfect support for STC MCU program download and debugging, STC official recommended solution;
Support external output voltage, 3.3V 5V can be selected;
Three indicator lights: TX (serial port sending indication), RX (serial port receiving indication), Ready (module serial port initialization completed);
Hardware full-duplex serial port, built-in transceiver buffer, support communication baud rate 50bps ~ 2Mbps.
Main control chip CH340T, compatible with CH341 driver;
Support WINDOWS 98/ME/2000/XP/server 2003/VISTA/server 2008/WIN 7/8/64/32-bit.
Module size: 52mm (overall length) x 18mm (overall width) x12mm (overall height), PCB size: 32x18x1.6mm.
Application:
Emulates standard serial ports for upgrading original serial peripherals, or adding additional serial ports via USB.
Need to use UART, TTL serial port and other occasions: such as Zhongjiu flashing machine, routing upgrade, hardware maintenance, etc.
Electronic engineer program debugging download;
Various hardware systems, software system debugging;
Instructions for use:
Definition of looper interface:
This board adopts a 6-pin interface with a spacing of 2.54MM, which can be connected by Dupont wire:
CTS, RTS, RXD, TXD, GND, VCC (marked from left to right on the small board)
Definitions are as follows:
CTS - Clear To Send, send clear, it is an input signal, stop sending when valid;
RTS -Require To Send, sending a request, is an output signal, used to indicate that the device is ready to receive;
RXD: input, the TTL serial port receives the signal (connected to the TX of the MCU);
TXD: output, TTL serial port sending signal (connected to RX of MCU);
GND: signal ground;
VCC: system power supply, which is consistent with the power supply of the conversion chip, which can be supplied from external input voltage or as output;
Common serial port functions generally only need to connect three signals: RXD TXD GND, VCC can not be connected;
When communicating with a UART that needs to support hard flow control, CTS RTS RXD TXD GND is generally used, and VCC is not required;
Level selection: (same as YS-CH341T)
This module outputs signal level and provides VCC voltage output to support 3.3V or 5V. It is mainly configured by 6 pins with red jumper caps, which can achieve the following functions:
A. USB power supply, 3.3V, TTL is 3.3V level, suitable for 3.3V TTL target system, can provide 3.3V voltage, the factory default is this configuration.
B. USB power supply, 5V, TTL is 5V level, suitable for 5V TTL target system, can provide 5V voltage.
C. VCC is powered by an external power supply, and the level is determined by the power supply voltage. There are two configurations: 3.3V and 5V. In this mode, the USB power supply is disconnected.
![YS-CH340T](https://ae01.alicdn.com/kf/S47bc6a4156584dd48352afdc1098002bV.jpg)
Serial port information acquisition: in UART mode, query the current USB COM port information through this software
![USB](https://ae01.alicdn.com/kf/Sa94ec29d30c14727b95cf1de29ed8b63I.jpg)
Serial line baud rate test software (self-test method: RX and TX are short-circuited, spontaneously send and receive, display OK is passed, NG is fail)
![](https://ae01.alicdn.com/kf/S36be33d06774476fab222967a49ac99bU.jpg)