RS-232 Data Switch - In 1989, at university, after the success with
submitting a writeup about my homemade 68008 single-board computer as a co-op work
term report, I hatched the idea of building another piece of gear that I wanted
anyway, and submitting it as an EE499 project. EE499 was the course code [Designed
by Markus Wandel] |
RS-232 Db-9 Switch-To-Flip Between Two Serial Ports - got a
problem with my notebook, because it has only COM1. My programmer board,
Easy-Downloader must use serial port and the application board also needs to
communicate via the same serial port. I do remembered I have to swap DB9 connector
of both devices many times. So I spent 30 minutes built above simple hardware. Of
course.....(electronic circuit added 4/05) |
RS232 Expander - Simple hardware expands COM1 to COM1/1 and COM1/2.
(circuit added 09/09) |
RS-232 Interface Circuits for 3.3V Systems - DN75 Design Notes
(Linear Technology) (app note added 1/06) |
RS-232 Laser Transceiver - Laser based projects used to be expensive,
until the development of solid state lasers. This project is designed for
the entry level laser experimenter. The circuit allows any two computers with
serial (RS-232) communication capability to communicate over 200 meters using a
laser beam. A low cost transmitter only circuit is also presented here for use in
one way communication and other laser based projects.....(electronic circuit added
4/05) |
RS232 Level Conversion - RS232 Level conversion..... |
RS-232 Line Driver Power Supply - National Semiconductor Application
Note (app note added 2/06) |
RS-232 Line Monitor & Loopback Cables - (electronic circuit added 4/05)
|
RS-232 Overvoltage Protection Circuits - (electronic circuit added 1/03)
|
RS-232 Protocol Analyser - (electronic circuit added 4/05) |
RS-232 Serial Port Buffer Circuit - (design circuit added 8/02)
|
RS232 Serial Port PIC Programmer - PIC Programmer is an essential tool
if you wish to learn or build projects with Microchip PIC Micro Processors.
This programmer is for those who do not have a Parallel Port on their PC.
Programmer may be used with Free Windows Software such as "PIC PROGRAMMER
Professional Serial" from Oshosoft and may work well with other serial programming
software. ….(design added 11/08) |
RS232 Serial to USB Converter - This is simple RS232 Serial to USB
Converter that doesn’t need any further explanations. You can use it for any
projects that might need it. Diagrams for USB and DB-9 female connectors are
provided. ….(electronic schematic added 11/08) |
RS-232 Surge Protection - (electronic circuit added 11/05) |
RS-232 to IRDA Convertor using Vishay Toim3232 - (electronic circuit
added 4/05) |
RS-232 to TTL Cable - (electronic circuit added 4/05) |
RS-232 to Wireless Instrument Data Channel - This is an adapter that
allows a terminal to communicate via a 100 MHz data channel with peripherals on
the same desk top. Keystrokes from the terminal are are received through the
RS-232 connection and sent through the 100 MHz RF data channel. (ATtiny2313,
AT90S2313)..... |
RS-232 Transceiver with Automatic Power Shutdown Control - Design Notes
(Linear Technology) (app note added 1/06) |
RS-232 Transceivers for Hand Held Computers Withstand 10kv Esd - DN64
Design Notes (Linear Technology) (app note added 3/06) |
RS-232/485 converter has automatic flow control - 04/12/01 EDN-Design
Ideas.....RS-485 communications can provide longer range and better noise immunity
than RS-232, as well as multidrop capability. Because it does not have separate
transmit and receive lines, RS-485 requires flow control.….PDF contains multiple
circuits, scroll to find this circuit..... [Design Idea by John Howard, Kw Aware,
Ventura, CA] |
RS-232/DALI Bridge Interface - Microchip Application Note Published
26-Apr-02 (app note added 2/06) |
RS-232: Lowe Hf-225 Interface - If you have access to a Lowe HF-225
shortwave receiver, then you might be interested in this page. If you don't, then
you'd probably be better off leaving now. What follows is a project I completed
some time ago, which allows the Lowe HF-225 to be controlled from a PC, or other
device with an available RS232 port. The Rx has an input for a remote keypad, and,
consequently, was begging for me to hook my PC up to it. I don't feel the need to
spell out the advantages,.....(design added 07/08/09) |
RS-232C circuit has galvanic isolation - 04-Feb-99 Issue of EDN
Galvanic, or electrical, isolation is a well-established technique for noise
reduction and works best in computer and industrial systems in which noise can
seriously affect data transfer. Isolation removes ground-loop currents and their
associated noise voltages from data lines.....file has several circuits, scroll to
this one..... [Design Idea by Ioan Ciascai, REI Data, Napoca, Romania] |
RS-232c Communication using UART - Toshiba 870X Series Application Note
(app note added 2/06) |
RS232c Interface Meets Telecommunications Safety Specs - 09/28/95
EDN-Design Ideas.....RS-232 isolation circuit..... EDN is migrating links. This
link is not verified. Google the "title" EDN for new link. |
RS-232c Interface with Cop800 - National Semiconductor Application Note
(app note added 2/06) |
RS232C Level Converter - A circuit for RS232C level converter, MAX232
and DS275… [Wichit Sirichote] |
RS-232c Level Converter using Transistors - There're many, who built the Easy
Programmer or C-52 EvaluationBoard, asking for the RS232C level converter chip,
DS275. Many have changedto MAX232 instead, because of not available in his home.
Here is anothersimple and cheap circuit using small signal transistor providing
TTL toRS232C level converter..... [Wichit Sirichote] |
RS232c Line Driver IC Drives Power MOSFETs - 10/24/96 EDN-Design
Ideas.....Easy to effect an interface between power MOSFETs and TTL circuits.…
[Design Idea by Santosh Shetty, NCRA, Pune University, Pune, India] |
RS232c Link Monitors Animal Activity - 11/06/97 EDN-Design Ideas.....A
common need in biological experimentation is the ability to unobtrusively monitor
the activity of small caged animals, such as mice, rats, and rabbits, as they move
about their enclosures. This monitoring must be over long periods and around
the clock. The circuit in..... [Design Idea by W Stephen Woodward, University of
North Carolina--Chapel Hill] |
RS232C Powers & ReaDS 8 Bit Switch Matrix - 04/11/96 EDN-Design
Ideas..... EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
RS232c Serial Port Scans Remote Keypad - 12/04/97 EDN-Design
Ideas.....In many embedded or control applications, you might prefer to use a
small, customized keypad with your PC-based system rather than a full-fledged
alphanumeric keyboard. You may also need to locate the keypad some distance from
the system hardware. If you have [Design Idea by SK Shenoy, NPOL, Kochi, India] |
RS-232-to-RS-232 Port Powered Optical Isolator -
Brochure with schematic in PDF format / (added 7/02) |
RS485 Transceivers Operate at 52Mbps over 100 Feet of Unshielded Twisted Pair
- DN168 Design Notes (Linear Technology) (app note added 1/06)
|
RS485 Transceivers Reduce Power & EMI - DN102 Design Notes (Linear
Technology) (app note added 1/06) |
RS485 Transceivers Sustain ±60V Faults - DN203 Design Notes
(Linear Technology) (app note added 1/06) |
RS485-Like Multi-Drop Bus with Half Duplex Serial Protocol - PBUS is an
RS485-like multi-drop bus for interconnecting PIC and other microcontroller-driven
devices. Protocol and software is written by Jap. Just include a separate pbus
library file into your project and add your command handlers for the specific
device in a few lines..... [Peter Jakab, Electrical Engineer, Engineer of
Informatics] |