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 __ Designed by Wichit Sirichote
RS-232 Interfaces for 3.3V Systems
DN75 Design Notes___ Linear Technology/Analog Devices
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 __ Designed by shaunwilson19 @ yahoo.com
RS232 Level Conversion
RS232 Level conversion __
RS232 Level Converter
This converter comes as an aid to STK500 board. It uses the famous MAX232 for the signal level translation. It requires a 1 to 1 rs232 cable for the connection with the PC. __ AVR Projects Dim
RS-232 Line Monitor & Loopback Cables
If you have problem with RS232 cabling, your best "emergency" tool may be a breakout box (sometimes called an LED box). The normal units only come in the DB25 size, but with a couple of DB9 to DB25 adaptors, they can be used with DB9 cables as well. The units have an LED for each signal line in the cable, and the LED lights green or red dependent on the signal state. __ Airborn Electronics, Australia
RS-232 Overvoltage Protections
RS-232C serial port lines are quite prone to be damaged by overvoltages. The damaged to computer serial ports have become more and more expensive to replace because of higher intergaration: usually you have to buy new motherboard if one serial port in it gets broken. So it is wise to use some extra protection in situations where overvoltages surges are quite propabe and repairing gets expensive. For examples of this type of situations are long serial port lines side the building and situation where the computer is connected to ungrounded outlet or the electricity distribution wiring is is not well organized. __ Designed by Tomi Engdahl
RS-232 Protocol Analyser
In need for a cheap but effective RS-232 Protocol Analyser? Just make your own Y adaptor to enable the logging or display of data transmitted and/or received in ASCII, Hex, Decimal or Hex-Dump formats. A configuration file is included to allow quick setup and analysis. __ Designed by Craig Peacock
RS-232 Serial Port Buffer
This is a simple serial port buffer circuit I designed for a friend to speed up his SLIP connection in campus computer network "TRINET" of Helsinki University of Technology. The problem in the network was that the RS232 commections from rooms to terminal server were long and made of bad quality wiring. __ Designed by Tomi Engdahl
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 built using Free Windows Software called WinPicProg and other similar software from PICALLW or Oshosoft __
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. __
RS-232 Surge Protection
RS-232C serial port lines are quite prone to be damaged by overvoltages. The damaged to computer serial ports have become more and more expensive to replace because of higher intergaration: usually you have to buy new motherboard if one serial port in it gets broken. So it is wise to use some extra protection in situations where overvoltages surges are quite propabe and repairing gets expensive. For examples of this type of situations are long serial port lines side the building and situation where the computer is connected to ungrounded outlet or the electricity distribution wiring is is not well organized. __ Designed by Tomi Engdahl
RS-232 to TTL Cable
A common feature found on many Microcontrollers is a serial port (often called a SCI, COM, or ASYNC port). I am going to use the term SCI as a short cut to mean the serial port on your Microcontroller. Quite often, the SCI on your Microcontroller will generate the appropriate LOGIC signals to communicate with another chip. They do not, however, generate the proper voltages required for connecting to RS-232 devices. This article is going to describe the differences between RS-232 and TTL, and how to build a converter so you can connect your Microcontroller to an RS-232 compatible device, such as the COM port on your PC. __ Designed by Kevin Ross
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. See the page, Digital Wireless for the Desktop, on this site, for the basics of the transmitter, receiver, and data format. The reason I made this was to make a simple method of switching between instruments on my desktop. I was staring to accumulate a number of microcontroller-based devices that I want to be able to switch my computer among quickly and this provided the simplest desktop networking solution I could think of. __ Designed by Dick Cappels
RS-232 Transceiver with Automatic Power Shutdown Control
DN30 Design Notes___ Linear Technology/Analog Devices
RS-232 Transceivers for Hand Held Computers Withstand 10kv Esd
DN64 Design Notes___ Linear Technology/Analog Devices
RS-232 Xlater
A simple terminal program on a PC can have a lot of uses. The hang-up is that most of those uses involve communicating with a device running on 5 volts. I've done several schemes over the years but this one is my favorites. __ Designed by Luhan Monat, Mesa, AZ
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 controlPDF contains multiple circuits, scroll to find this circuit04/12/01 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 controlPDF contains multiple circuits, scroll to find this circuit by John Howard, Kw Aware, Ventura, CA
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, __ Contact: void @ blankfrank.co.uk
RS-232C handshake lines transfer data frame
10/23/97 EDN-Design Ideas The asynchronous RS-232C interface is a simple, low-cost option for interconnecting processor-based systems, but this character-oriented interface supports no direct mechanism to transfer variable-sized messages as self-contained data packets. However, you__ Circuit Design by SK Shenoy, Naval Physical & Oceanographic Lab, Kochi, India
RS-232C has galvanic isolation
04-Feb-99 EDN-Design Ideas NOTE
: File has several circuits, scroll to this one. 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__ Circuit Design by Ioan Ciascai, REI Data, Napoca, Romania
RS232c Interface Meets Telecommunications Safety Specs
09/28/95 EDN-Design Ideas RS-232 isolation circuit.__ Circuit Design by Martin O'Hara, Newport Components, Milton Keynes, UK
RS232c Level Converter
A circuit for RS232C level converter, MAX232 and DS275 __ Designed by 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 __ Designed by 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.__ Circuit Design by Santosh Shetty, NCRA, Pune University, Pune, India
RS-232C 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__ Circuit Design by W Stephen Woodward, University of North Carolina--Chapel Hill
RS-232C 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__ Circuit Design by SK Shenoy, NPOL, Kochi, India
RS232C Powers & Reads 8 Bit Switch Matrix
04/11/96 EDN-Design Ideas The circuit in Figure 1 provIdeas a remote menu-selection switch matrix for PCs. It connects a linear, 8-bit switch to the RS-232C port; the RS-232C signal pins provide the circuit's frugal power requirements. You can easily modify the circuit to read more switch inputs. The heart of the circuit is a 74HC165 8-bit, serial-output shift register. It's important that you use either this register or a similar one from a low-power IC family. The shift register has eight parallel-input pins that receive their drive from an 8-bit DIP-switch matrix.__ Circuit Design by BR Dhananjay Gadre, IUCAA, Pune, India
RS-232-to-RS-232 Port Powered Optical Isolator
Brochure with schematic in PDF format___ BB Electronic
RS485 Transceivers Operate at 52Mbps over 100 Feet of Unshielded Twisted Pair
DN168 Design Notes___ Linear Technology/Analog Devices
RS485 Transceivers Reduce Power & EMI
DN102 Design Notes___ Linear Technology/Analog Devices
RS485 Transceivers Sustain ±60V Faults
DN203 Design Notes___ Linear Technology/Analog Devices
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 __ Designed by Peter Jakab |