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USB to 3.3V TTL DB9 Adapter

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USB to 3.3V TTL DB9 Adapter

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SKU: SS-201BTTL

Availability: Out of stock.

Regular Price: $39.95

Special Price: $29.95

Quick Overview

USB to 3.3V TTL DB9 Adapter provides auto handshaking and supports single board USB to asynchronous serial data transfer interface with low bandwidth consumption.


This SS-201BTTL USB to Serial UART is a transistor-transistor logic (TTL level) adapter. It allows you to connect your computer through USB port and use it as a regular serial communication. UARTs transmit one bit at a time at a specified data rate, all USB protocol is handled within this adapter.

There is no other device or programming required. The adapter is for embedded systems that require a serial connection to a computer where a native COM port is not available. The board attaches directly to the USB bus via a standard type A receptacle connector. It shows up on any Windows computer as a standard serial COM port. Any applications that talk to this COM port is automatically convert to USB and back to UART to your target board.

USB to 3.3V TTL DB9 Adapter Features



  • The Cable provides a USB to TTL Serial interface with DB9 D-SUB connector.
  • Single board USB to asynchronous serial data transfer interface
  • Entire USB protocol handled by the electronics in the cable USB
  • UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity
  • Fully assisted hardware (RTS#/CTS#) or X-On / X-Off software handshaking.
  • Data transfer rates from 300 baud to 3 Mbaud at TTL levels.
  • +3.3V output allows external logic to be powered from the USB port
  • Transmit and receive LEDs
  • UHCI / OHCI / EHCI host controller compatible
  • Low USB bandwidth consumption.

USB to TTL DB-9 Pin Assignmant


DB-9M Pin Assignment
DB-9M Pin Assignment
Pin 1
Pin 2 RX
Pin 3 TX
Pin 4
Pin 5 GND
Pin 6
Pin 7 RTS
Pin 8 CTS
Pin 9
SKU SS-201BTTL
UPC 729440625863
Manufacturer GearMo
Color Beige
Cable Length 3 feet
Warranty One Year
DB9 Gender Male w/ Hex Nuts
Compatibility All Operating Systems

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