RS-232 and other serial ports and interfaces
Pin Function Description Circuit EIA
1unused
2Digit PresentA signal given to the ACE indicating that the digit lines contain a digitDPR
3Abandon Call and RetryAn indicator signal from the ACE that it could not make a connection. Could be "busy".ACR
4Call RequestA signal from the DTE that tells the ACE to go "off hook"CRQ
5Present Next DigitA signal from the ACE to the DTE to indicate that the ACE is ready to receive the next digit.PND
6unused
7unused
8unused
9unused
10unused
11unused
12unused
13Distant Station ConnectedIndicator from ACE to DTE that the call is succesfully made.DSC
14-17Digit Signal CircuitsFour lines containing a parallel BCD dial digit (10 digits, plus control digits)NB1-NB8
18unused
19unused
20unused
21unused
22Data Line OccupiedAn 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
23unused
24unused
25unused
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the DTE (Computer)
25 pin D-SUB female connector layout
25 pin D-SUB female connector
at the DCE (Modem)
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RS-366 interface visual pinout:
RS-366 interface diagram
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Source(s) of this and additional information: RS366 Page at Connectivity Knowledge Platform (Made IT)
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