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USB-TTL - USB to TTL Level Serial Converter Board


  • Adds a high speed TTL level serial interface by connecting to a USB port
  • Provides 3.3V or 5V TTL level serial interface for most microcontroller interfaces
  • Provides +5 VDC or +3.3 VDC power for external devices
  • Powered by USB port, no external power adapter required
  • LEDs indicate TxD and RxD for easy port monitoring and diagnosis
  • Requires no IRQ, DMA, I/O port
  • Terminal block connector provided for easy connection
  • High speed serial port with baud rate up to 921.6kbps
  • Supports Windows XP to 10, Server 2000 to Server 2016
  • Supports Linux Kernel 2.4 and above
  • Supports Mac OS X 10.9 and above, driver signed by Apple


Compliance USB 1.0/1.1, 2.0 & 3.0 compatible
Speed 12Mbps, full-speed USB
FIFO 128 byte transmit
384 byte receive
Serial Interface
Interface TTL level
Number of Ports 1
Connector Terminal block
Max. Speed 921.6kbps for transmit & receive
TTL level signals TxD, RxD, RTS, CTS
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Parity None, odd, even, mark, space
Stop Bit 1, 1.5, 2
Flow Control Hardware (RTS, CTS), XON/XOFF
Power Input Power supplied via USB (5V) connector
No external power needed
Dimensions 60mm × 30mm with USB Type-A connector
45mm × 30mm without USB Type-A connector