• on Computer/Software/Internet
  • Published in issue 7/2008 on page 63
About the article

USB <-> RS-232 Cable

USB <-> RS-232 Cable

This project lets you conveniently connect any computer with USB ports directly to a simple, traditional connector — the 9-pin RS-232 (anyone remembers it?).

It converts the electrical signals from a USB<–>serial TLL convertor to the RS-232 standard. So in a nutshell, it converts a USB port into a standard but basic serial port: only the four basic signals are available.

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Products
Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Capacitors
C1-C5 = 100nF 25V (SMD 1206)
Semiconductors
IC1 = MAX3232CSE (or -ESE)
Miscellaneous
K1 = 6-way right-angled SIL pinheader
K2 = 9-way cable mount sub-D plug (male)
FTDI TTL-232R-5.0V cable, Elektor SHOP # 080213-71
Piece of large diameter heatshrink sleeving
PCB, ref. 080470-I from www.thepcbshop.com
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