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USB-C to DB9 RS232 Cable

CBL-USBC-DB9

Serial RS232 cable for laptops that only have USB-C. FT232R chipset.

Type: Converter
Connectors: USB-C / DB9

In-depth technical details

USB-C has 24 pins, and its real distinguishing feature is symmetry: 4 VBUS + 4 GND pins (for reversibility and higher current), 2 CC pins (only one active at a time -- the actual mechanism behind plugging in either way, and how Power Delivery negotiation happens), plus SuperSpeed differential pairs that can carry USB 3.x data or, in Alt Mode, DisplayPort video. DB9/RS-232 has 9 pins, but a basic connection only needs 3: pin 2 = RXD (receive), pin 3 = TXD (transmit), pin 5 = GND. The remaining pins carry modem-control signaling most simple serial links don't use.

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End A

USB Type-C

01 24 pins, reversible The pins are laid out with rotational symmetry, so either way up gives the same connection. That is why there is no wrong way round.
02 CC negotiation lines The two ends use these to agree voltage and current before any power flows — what makes 100 W charging safe.
03 Oval shell The rounded oval spreads insertion stress and survives being plugged in far more times than older shapes.
04 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
05 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

End B

DB9 (RS-232)

01 9 pins A 9-pin serial port, but a basic connection only needs 3: pin 2 = RXD (receive), pin 3 = TXD (transmit), pin 5 = GND. The remaining pins carry modem-control handshaking most simple serial links don't use.
02 D-shaped shell The D profile only fits one way round, so the plug cannot be inserted upside-down and bend its pins.
03 Thumbscrews Hand-tightened to hold the plug home. A loose one is why a picture flickers, or loses one colour channel.
04 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
05 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

From the published standard

How it works

An internal chip (often an FTDI family part) translates between digital USB signalling and RS232's traditional voltage levels (±5 to ±15V), appearing to the system as a virtual COM port through a driver. Legacy equipment -- PLCs, point-of-sale printers, industrial gear -- expects exactly that voltage and protocol, not USB directly.

Function: USB-to-RS232 level translation, appears as a virtual COM port
Common chipset: FTDI-family USB-serial bridge

This information comes from published sources about this type of product, not from the supplier.

en.wikipedia.org

Applications

Connecting a modern device to an older screen
Driving a meeting-room projector

Technical specifications

Type	Converter
Connectors	USB-C / DB9

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