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In our documentation center we found a document about this interface. It's brief and all info that might be handy for you people out there is provided here (ofcourse as is). If you have more info, let us know!

According to this document the 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).

The physical interface used is a Sub-D25 and the pinning seems to be like this:

Sub-D25M Sub-D25F

Pin Function Description Circuit
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
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
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