• on Computer/Software/Internet
  • Published in issue 12/2003 on page 0
About the article

Wireless RS 232 Link

Using licence-exempt Short Range Devices (SRDs)

Wireless RS 232 Link
As we show in this article, off the shelf radio modules called Short Range Device (SRDs) with an integrated microcontroller are here, making home construction of a wireless RS232 link a reality for DIY constructors.Wireless transmission of ‘information’, be it digital data, music or video, is sure to find wide application areas. Today, those of you with an active interest in ‘over-the-air’ technology have a large number of options to choose from, ranging from transmission of infrared light pulses (remote controls, IrDA) right up to more challenging fields like RF applications called DECT, Bluetooth, Wireless LAN and so on. For ‘large’ Windows computers you can buy ready-made modules which are not only easy to add to existing equipment, but also certified and complete with a manufacturer’s product warranty, not forgetting a suitable driver for the software link.
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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.

R1-R4 = 1kOhm8
C1,C3,C9 = 100nF
C2,C4 = 10µF 16V radial
C5-C8 = 1µF 16V radial
D1 = 1N4148
D2,D3,D5 = LED, green, 3mm, low current
D4 = LED, red, 3mm, low current
IC1 = 7805CP
IC2 = MAX232CP
IC3 = ER400TRS from LPRS (see text)
JP1 = jumper with 2-way pinheader
JP2 = jumper with 3-way pinheader
K1,K3 = 2-way pinheader
K2 = 9-way sub-D socket (female), angled pins, PCB mount
K4 = BNC socket, 50Ohm, PCB mount (Farnell # 365-0558)
RS232 cable (non crossing)
PCB, order code 030204-1
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