RS-232

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RS-232

(communications)
A standard developed by the Electronic Industries Association that governs the interface between data processing and data communications equipment, and is widely used to connect microcomputers to peripheral devices.

RS-232

RS-232

(Recommended Standard-232) A TIA/EIA standard for serial transmission. Although employed for numerous other purposes, the RS-232 serial port was widely used on earlier personal computers prior to USB (see serial port). The RS-232 cable limitation of 50 feet can be extended to several hundred feet with high-quality cable.

Although RS-232 defines the signals for 25 lines, many applications use less than a dozen, which is why both DB-25 and DB-9 connectors are used. RS-232 transmits positive voltage for a 0 and a negative voltage for a 1. In 1984, RS-232 was officially renamed TIA/EIA-232-E. See RS-232/485.

Pin Settings for Plug(Reverse order for socket.)
  ______________________________________
  1  2  3  4  5  6  7  8  9  10 11 12 13
   14 15 16 17 18 19 20 21 22 23 24 25

           _________________
             1  2  3  4  5
               6  7  8  9


 25 pin                        9 pin

  1 - PG   Protective ground
  2 - TD   Transmitted data     3
  3 - RD   Received data        2
  4 - RTS  Request to send      7
  5 - CTS  Clear to send        8
  6 - DSR  Data set ready       6
  7 - SG   Signal ground        5
  8 - CD   Carrier detect       1
  9 - + voltage (testing)
 10 - - voltage (testing)
 11 - 
 12 - SCD  Secondary CD
 13 - SCS  Secondary CTS
 14 - STD  Secondary TD
 15 - TC   Transmit clock
 16 - SRD  Secondary RD
 17 - RC   Receiver clock
 18 - 
 19 - SRS  Secondary RTS            9 pin
 20 - DTR  Data terminal ready      4
 21 - SQD  Signal quality detector
 22 - RI   Ring indicator           9
 23 - DRS  Data rate select
 24 - XTC  External clock
 25 - 
References in periodicals archive ?
With a RS232C remote terminal, daisy chain connection enables control of up to seven cameras.
Tenders invited for Integrated 250 kva resistancewelding power supply along withhandheld programming terminal asper following specifications:nullpower : 2 phase 440 voltnullwelding control: integratednulli/o interface: digital i/o~s fromplc or logic controlnullrating: 250 kvanullcommunication: rs232c or rs422nullpc/laptop connectivity: yesnullsoftware configuration: yesnullmodes of operation:phase angle control,constant voltage control,constant current controlnullcurrent sensors:1 nonulldocumentation: cd and hard copy ofrelevant operation and servicemanuals requirednull
Equipped with two logic outputs and two logic inputs as standard, the WT1 can be fitted with either an RS232C half- duplex or RS485 full duplex serial door; both serial doors can be loaded with ASCII or Modbus RTU protocols to enable communication with a PC or PLC.
* Data output is via USB, Digimatic, Opto RS232C, or wireless, and battery life is about three years
Table I: Rs 232 Communication Specification for proposed work Transmission Method RS232C asynchronous, half duplex.
The instrument features simple Remote Display connectivity using the dedicated, optically isolated 20mA output or any of three RS232C ports.
Electronics M10-52230 y un multimetro UNI-T UT61C RS232C (USB) (Figura 2).
Sensors UK says depending upon the application it can offer a wide a choice of output options such as a programmable 4~20mA or RS232C output and SSI and there are even three digital outputs, two of which can be programmed as relay alarms.
Por otra parte, en [11] se realizo un sistema de control de temperatura conformado por un PC para desarrollar un controlador robusto no lineal y un microcontrolador para establecer una comunicacion serial (RS232C) con el PC y generar una senal PWM que actue sobre la celda Peltier; la respuesta de la temperatura para un set point con AT=3[grados]C, tiene las siguientes caracteristicas: error=0.1[grados]C, [%.sub.sobrepeso] =0, [1.sub.eficaz] =1.5A, [t.sub.estabilizacion] = 400s.
Measurement date can be read out to PC or printer through RS232C port.
Communication between notebook computer and wireless modem uses RS232C. Figure 6 shows the data transmitter and receiver using RF communication.
All the measurements were done on a spectrophotometer Specord 50 analytik jena (Analis, Belgium) connected to a personal computer via an RS232C interface.