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Principles of Voice & Data

Principles of Voice & Data. RS-232 Simplified Bellevue Community College Bob Young, Instructor. The RS-232 Signal. Negative, Bipolar Logic. Typical RS-232 Connection. DTE Pin-0ut. DCE Pin-Out. Connecting the Pins. Signal Ground & Shield. Pin 7 -- Signal Ground Pin 1 -- Shield.

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Principles of Voice & Data

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  1. Principles of Voice & Data RS-232 Simplified Bellevue Community College Bob Young, Instructor

  2. The RS-232 Signal Negative, Bipolar Logic

  3. Typical RS-232 Connection

  4. DTE Pin-0ut

  5. DCE Pin-Out

  6. Connecting the Pins

  7. Signal Ground & Shield • Pin 7 -- Signal Ground • Pin 1 -- Shield

  8. Transmit & Receive Data • Pin 2 -- Transmit Data (TD, TxD) • Pin 3 -- Receive Data (RD, RxD)

  9. Request to SendClear to Send • Pin 4 -- Request to Send (RTS) • Pin 5 -- Clear to Send (CTS)

  10. Data Set ReadyData Terminal Ready • Pin 6 -- Data Set Ready, DCE Ready • DSR, DCE • Off hook, finished dialing, generating answer tone • Pin 20 -- Data Terminal Ready, DTE Ready • DTR, DTE • DTE sends this signal to prepare modem

  11. Carrier Detect • Pin 8 -- Carrier Detect (CD) • Receiving answer tone from far end

  12. Null Modem Adaptors "How do I know if I need one?"

  13. Shortcuts • Jumper 4 and 5 • Jumper 6, 8, and 20

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