Transcription of RS-232 INTERFACE - TSCM
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RS-232 INTERFACE - TSCM
Frame (Chassis) GroundTransmit dataReceive dataSignal GroundRequest to sendCarrier detectData set readyRing indicatorData terminal readyTransmit dataReceive dataRequest to sendCarrier detectData set readyRing indicatorData terminal ready123745862220 Clear to sendClear to send123745862220 COMPUTERTERMINALRS-232 1. Direct-to-computer RS-232 InterfaceRS-232 INTERFACEI ntroduction:The RS-232 INTERFACE is the Electronic Industries Association (EIA) standard for the interchange of serial binarydata between two devices. It was initially developed by the EIA to standardize the connection of computers with telephoneline modems. The standard allows as many as 20 signals to be defined, but gives complete freedom to the user.
The standard RS-232-C connector has 25 pins, 21 pins which are used in the complete standard. Many of the modem signals are not needed when a computer terminal is connected directly to a computer, and Figure 1 illustrates how some of the "spare" pins should be linked if not nee ded. Figure 1 also illustrates the pin numbering used in the original
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