pinout (распиновка)

RS366 interface

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25 pin D-SUB MALE connector  at the DTE (Computer)

RS366 interface describes the "Interface Between Data Terminal Equipment and Automatic Calling Equipment for Data Communication." To tell that in a normal language is almost impossible. There are situations where automatic dialing is required. Some phone companies deliver an automatic dialing unit for these situations and this interface is used to connect a DTE to these Automatic Calling Equipment (ACE). Pin Function Description Circuit EIA 1 unused 2 Digit Present A signal given to the ACE indicating that the digit lines contain a digit DPR 3 Abandon Call and Retry An indicator signal from the ACE that it could not make a connection. Could be "busy". ACR 4 Call Request A signal from the DTE that tells the ACE to go "off hook" CRQ 5 Present Next Digit A signal from the ACE to the DTE to indicate that the ACE is ready to receive the next digit. PND 6 unused 7 unused 8 unused 9 unused 10 unused 11 unused 12 unused 13 Distant Station Connected Indicator from ACE to DTE that the call is succesfully made. DSC 14-17 Digit Signal Circuits Four lines containing a parallel BCD dial digit (10 digits, plus control digits) NB1-NB8 18 unused 19 unused 20 unused 21 unused 22 Data Line Occupied An indicator that is used by the ACE to let the DTE know that the line it wants to use is used by another device. DLO 23 unused 24 unused 25 unused

25 pin D-SUB FEMALE connector  at the DCE (Modem)

Источник: RS366 Page at Connectivity Knowledge Platform (Made IT)