pinout (распиновка)

SUN LX/Classic/SS4/5/10/20 Serial Port connector

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This port is located in modern SUN Sparcs such as SUN LX/Classic/SS4/5/10/20 and has both serial ports (A/B) in the same connector. Simply plugging in a regular serial cable in results in accessing port A.

25 pin D-SUB FEMALE connector  at the computer

Pin Name Port Dir Description 2 TXD A Transmit Data 3 RXD A Receive Data 4 RTS A Request to Send 5 CTS A Clear to Send 6 DSR A Data Set Ready 7 GND - - System Ground 8 CD A Carrier Detect 11 DTR B Data Terminal Ready 12 CD B Carrier Detect 13 CTS B Clear to Send 14 TXD B Transmit Data 15 TC A Transmit Clock from DCE, usually not used 16 RXD B Receive Data 17 RC A Receive Clock from DCE, usually not used 18 TC B Transmit Clock from DCE, usually not used 19 RTS B Request to Send 20 DTR A Data Terminal Ready 21 TCO A Transmit Clock from DTE, usually not used. 25 TCO B Transmit Clock from DTE, usually not used.

Note: Direction is DTE (Computer) relative DCE (Modem).
Note: Do not connect SHIELD(1) to GND(7).

Источник: SUN Field Engineer Handbook, VolumeII, 12/15/93