USB to RS232 Adapter

USB to RS232 adapter providing a serial communication connection for a computer.

Tuning Tools
USB / RS232 adapter
Serial adapters

Reference unit price$12.51–13.84

Reference prices vary with exchange rates and the supplied package. Contact customer service to confirm the price, shipping and taxes.

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Reference unit price$12.51–13.84

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01 / About USB to RS232 Adapter

About USB to RS232 Adapter

This adapter adds a DB9 RS-232 serial connection to a computer's USB port for compatible legacy tuning interfaces. RS-232 uses different electrical levels from TTL UART, CAN and K-line. The chipset and driver must be identified before promising operation on a particular operating system.

02 / Specifications

Specifications

Connector / termination: USB / DB9 RS-232
Electrical signal: RS-232 serial, not TTL UART or direct CAN
Software / communication: Chipset-specific driver and virtual COM port
Version identification: Chipset, hardware ID, pinout and supported OS require identification
Application reference: ECU interface must specify RS-232 and matching pin assignment

03 / Package contents

Package contents

The actual supplied contents are confirmed in the itemized quote. Check the following items before payment.

Ask which cable and connectors are supplied. Your ECU may also need its own tuning lead.

04 / Fitment & installation: USB to RS232 Adapter

Fitment & installation: USB to RS232 Adapter

Check the model, hardware revision and connector pins against the device’s wiring diagram.
Confirm TX / RX / ground, straight-through versus null-modem wiring, baud rate and flow control. Select the correct COM port in the tuning software and test reading before writing.

05 / Questions about USB to RS232 Adapter

Questions about USB to RS232 Adapter

Is an RS-232 adapter a TTL USB lead?

No. The electrical levels differ. Use the interface required by the ECU rather than adapting connector shape alone.

Can Windows 11 / macOS support be guaranteed?

Not before the chipset and driver are identified. The tuning application's own operating-system support must also be checked.

Can the USB-to-RS232 adapter connect directly to CAN or OBDII?

This is an RS-232 serial adapter. CAN, TTL UART and vehicle diagnostic interfaces require their own electrical and protocol hardware; a plug adapter cannot supply that conversion.

What should I check when the USB-to-RS232 adapter is not detected?

Identify the chipset and hardware ID, install its supported driver, and confirm a virtual COM port appears. Then check the tuning software operating-system requirements and the ECU serial settings.

Does a DB9 connector guarantee the correct RS-232 pinout?

Check transmit, receive, ground and any required handshake connections. Straight-through and crossed wiring have different uses; connector shape does not identify the required cable arrangement.

06 / Manuals & resources