Features:
1. Support USB to 2 UART, or USB to 1 UART+1 I2C+1 SPI, or USB to 1 UART+1 JTAG
2. Supports 2-channel high-speed UART interface, baud rate up to 9Mbps, with CTS and RTS hardware automatic flow control
3. Supports 1-channel I2C interface, which is convenient for operating EEPROM or programming I2C devices such as OLEDs and sensors through the host computer.
4. Supports 1 SPI interface and has 2 chip select signal pins, which can control 2 SPI slave devices at different times.
5. Supports 1-way JTAG interface and can be used with OpenOCD for debugging and testing (due to limited chip and software function testing, users need to evaluate and test this function by themselves)
6. Onboard 3.3V and 5V level conversion circuit, used to switch the working level of the communication interface, with better compatibility
7. Onboard resettable fuse and ESD protection circuit provide over-current/over-voltage protection and ensure safe and stable communication.
8. Aluminum alloy shell, oxidized matte surface, CNC process opening, sturdy and durable, excellent workmanship
9. High-quality USB-B and DC connectors, smooth plugging and unplugging, durable and reliable, with anti-reverse connection protection

Product parameters:
1. Host interface: USB
2. Power supply: USB port, 5V
3. Working voltage: 3.3V/5V (selected through onboard switch)
4. USB:
Connector: USB-B
Interface protection: resettable fuse, ESD protection
5. Serial port:
Channel: 2 (red DIP switch needs to be set to M0 mode)
Connector: 6PIN IDC connector
Baud rate: 1200bps-9Mbps
Hardware flow control: CTS and RTS
6. I2C:
Channel: 1 (red DIP switch needs to be set to M1/M2 mode)
Connector: 12PIN IDC connector (the first 4 pins are I2C)
7. SPI:
Channel: 1 (red DIP switch needs to be set to M1/M2 mode)
Connector: 12PIN IDC connector (the last 8 pins are SPI)
8. JTAG：
Channel: 1 (red DIP switch needs to be set to M3 mode)
Connector: 12PIN IDC connector (the last 8 pins are JTAG)
9. Product size: 86 x 48 x 27.6mm
10. Weight: 170g

Packing list:
-USB to UART/I2C/SPI/JTAG x1
-USB Type A to Type B cable 1.2m x1
-12PIN cable 20cm x1
-6PIN cable 20cm x2