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RS-232C circuit has galvanic isolation - 02/02/99 EDN Design Idea (contains several designs, scroll to find this one) You can
obtain longer transmission distances with the RS-232C interface if you use galvanic isolation between the two
linked terminals. Galvanic isolation also eliminates problems arising from disparate potentials between
terminals. Using two MAX860/861 ICs and two TPL2200 optoisolators, you can obtain galvanic isolation for
three-wire transmission without external supplies (Figure 1). . . . [by Ioan Ciascai, REI Data, Napoca, Romania]
RS-232C handshake lines transfer data frame - 10/23/97 EDN Design Idea 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. . . [by SK Shenoy, Naval Physical & Oceanographic Lab,
Kochi, India]
RS232c Interface Meets Telecommunications Safety Specs - 09/28/95 EDN Design Idea RS-232 isolation circuit. . . . [by Martin O'Hara, Newport
Components, Milton Keynes, UK]
RS-232c Interface with Cop800 - Application Note. . . [National Semiconductor]
RS232C Level Converter - A standard serial interfacing for PC, RS232C, requires negative logic, i. e. , logic '1' is
-3V to -12V and logic '0' is +3V to +12V. To convert a TTL logic, say, TxD and RxD pins of the uC chips, thus
need a converter chip. A MAX232 chip has long been using in many uC boards. It provides 2-channel RS232C port and
requires external 10uF capacitors. Carefully check the polarity of capacitor when soldering the board. A DS275,
however, no need external capacitor and smaller. Either circuit can be used without any problems. . . . [Wichit
Sirichote, designer]
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, designer]
RS232c Line Driver IC Drives Power MOSFETs - 10/24/96 EDN Design Idea Easy to effect an interface between power MOSFETs and TTL
circuits. . . . [by Santosh Shetty, NCRA, Pune University, Pune, India]
RS-232C link monitors animal activity - 11/06/97 EDN Design Idea 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 per. . . [by W Stephen Woodward, University of North
Carolina--Chapel Hill]
RS-232C Multiplexer Serves As Multiport Adapter - 03/01/96 EDN Design Idea Multiport RS-232C PC add-on boards are intended for intensive
multichannel communication. Therefore, each serial port has its own transmission controller. If your application
doesn't need interrupt-driven service, and polling the devices through RS-232C channels one after another is
sufficient, then you can use a single controller with switched input and output signals instead of installing a
costly multiport adapter. . . . [by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of
Technology Warsaw, Poland]
RS-232C port scans remote keypad - 12/04/97 EDN Design Idea 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 th. . . [by SK Shenoy, NPOL, Kochi, India]
RS232C Powers & ReaDS 8 Bit
Switch Matrix - 04/11/96 EDN Design Idea The circuit in
Figure 1 provides 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 modif. . .
[by BR>Dhananjay Gadre, IUCAA, Pune, India]
RS232-Lowe HF-225 interface - . . .
RS232-RS485 Converter with
Automatic RX-TX Control - Today, although the wireless
technology grows very fast, the long distance funicular communication still keeps its popularity. The reason is
obvious that cost and complexity is high at the wireless communication. Click to enlarge RS232 is one of. . .
RS-232-to-RS-232 Port Powered
Optical Isolator - Brochure with schematic in PDF format.
. .
RS-485 Repeater Extends Standard's Reach - 05/26/94 EDN Design Idea RS-485 specifies communications for distances up to 4000 ft.
This limit is the consequence of losses in the twisted pair used to carry the data. Beyond 4000 ft, skin effect
and dielectric losses take their toll, attenuating the signal beyond use. . . . [by Mitchell Lee, Linear
Technology Corp, Milpitas, CA05.26.94]
RS485
Transceivers Operate at 52Mbps over 100 Feet of Unshielded Twisted Pair - DN168 Design Notes (Linear Technology). . . [Linear Technology]
RS485
Transceivers Reduce Power & EMI - DN102 Design Notes
(Linear Technology). . . [Linear Technology]
RS485
Transceivers Sustain ±60V Faults - DN203 Design Notes
(Linear Technology). . . [Linear Technology]
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]
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