# RS366

(at the DTE)
(at the DCE)

CORRECT?

25 PIN D-SUB MALE at the DTE (Computer).
25 PIN D-SUB FEMALE at the DCE (Modem).

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 |

Contributor: | Joakim Ögren

Source: | RS366 Page at Connectivity Knowledge Platform (Made IT)

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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-13