• Adopt original CH343G inside, fast communicating, stable and reliable, better compatibility
• Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal
• Onboard unibody digital isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
• Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & ESD protection
• Onboard self-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance
• Fully automatic transceiver circuit with no delay, ensures the USB port communicates with different interfaces fastly and stably, without interfering each other
• Onboard TTL serial 3.3V/5V voltage translator, config the TTL level via switch
• Aluminium alloy enclosure with sand blasting and anodic oxidation, CNC process opening, solid and durable
• 3 LEDs for indicating the power and transceiver status
• High quality USB-B and RS232 connectors, smoothly plug/pull
  Specifications

  PRODUCT TYPE	Industrial grade digital isolated converter
  USB	Operating voltage	5V
  	Connector	USB-B
  	Protection	200mA self-recovery fuse, isolated output
  RS232	Connector	DB9 male
  	Protection	TVS diode, surge protection & ESD protection
  	Transmission mode	Point-to-point
  	Baud rate	FT232RL: 300bps ~ 921600 bps CH343G: up to 600000 bps (not full band)
  RS485	Connector	Screw terminal
  	Pins	A+/B-/GND
  	Direction control	Hardware automatically discriminates and controls the direction of data transmission
  	Protection	600W lightningproof and surge-suppress, 15KV ESD protection (reserved 120R balancing resistor solder pads
  	Transmission mode	Point-to-multipoints (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more)
  	Baud rate	FT232RL: 300bps ~ 2 Mbps CH343G: up to 2 Mbps (not full band)
  TTL (UART)	Operating voltage	3.3V / 5V
  	Connector	Screw terminal
  	Pins	TXD, RXD, GND, 5V
  	Protection	clamp protection diode, over-voltage/negative-voltage proof, shock resistance
  	Transmission mode	Point-to-point
  	Baud rate	FT232RL: 300 bps ~ 2 Mbps CH343G: up to 2 Mbps (not full band)
  INDICATORS	PWR	Red power indicator, light up when there is USB connection and voltage is detected
  	TXD	Green TX indicator, light up when the USB port sends data
  	RXD	Blue RX indicator, light up when the device ports send data back
  OPERATING ENVIRONMENT	Temperature	-15℃ ~ 70℃
  	Humidity	5%RH ~ 95%RH
  OPERATING SYSTEM	Mac, Linux, Android, Windows 11 / 10 / 8.1 / 8 / 7

WIKI:https://www.waveshare.com/wiki/USB_TO_RS232/485/TTL_(B)