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This port is located in not-so 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.

== Pinout ==

[[Image:dsub25f.png]]

25 PIN D-SUB FEMALE at the computer.

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

<i>Notes:
* Direction is DTE (Computer) relative DCE (Modem).
* Do not connect SHIELD(1) to GND(7).</i>

== Contributions ==

* [[User:Niklas|Niklas Edmundsson]]

== Sources ==

* SUN Field Engineer Handbook, VolumeII, 12/15/93

[[Category:Connector]]