Interface Between Data terminal Equipment and Automatic Calling Equipment for Data Communications
[RS366 Description]
[RS366 Standard Organizations]
[RS366 Pin-Out]
['D' Connectors]
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EIA-366-A defines a complete interface between Data Terminal
Equipment (DTE) and Automatic Calling Equipment
(ACE).
The EIA-366 interface defines the Electrical signal characteristics, interface mechanical characteristics, functional
descriptions of interchange circuits, and standard interfaces.
The EIA-366 interface defines a complete interface between Data Terminal
Equipment (DTE) and Automatic Calling Equipment
(ACE).
The electrical requirements for the drivers and receivers
are identical to those in EIA/TIA-232-E [RS232].
Check the RS232 topic page for vendors making interface ICs or other data converters.
The EIA366 interface bus is obsolete, as is the RS232 interface. However; the RS232 is still in wide spread use.
The term "RS" has been obsolete for years now, all RS specifications should be referred to as EIA standards.
The EIA-366 standard was superseded by EIA-366-A in 2000.
Electronic Industries Alliance {EIA}, www.eia.org
Telecommunications Industry Association {TIA}, www.tiaonline.org
International Telecommunication Union {ITU}; www.itu.int
Unused pins are not listed in the table.
| Signal name | Mnemonic | Pin # |
|---|---|---|
| Shield | -- | 1 |
| Digit Present | DPR | 2 |
| Abandon Call & Retry | ACR | 3 |
| Call Request | CRQ | 4 |
| Present Next Digit | PND | 5 |
| Power Indication | PWI | 6 |
| Signal Ground | -- | 7 |
| Distant Station Connection | DSC | 13 |
| Digit Signal Circuit 1 | NB1 | 14 |
| Digit Signal Circuit 2 | NB2 | 15 |
| Digit Signal Circuit 4 | NB4 | 16 |
| Digit Signal Circuit 8 | NB8 | 17 |
| Receive Common | RC | 18 |
| Send Common | SC | 19 |
| Data Link Occupied | DLO | 22 |
The EIA366 interface used a 25-pin D connector [pin locations]; D-Sub connector [Dsub Vendors].
The DB-25 connector is more out-dated than obsolete, but it's a much larger connector than any of the styles being used to replace it.
The pin usage or pinout shown is and the standard is obsolete and should not be used.
Although fielded gear might be used long after the original specification become obsolete.
This particular connector shown is being used both for an RS232 interface or an RS366 interface.
The electrical requirements for the drivers and receivers are identical to those in EIA/TIA-232-E.
So RS366 could be combined with or share a connector with RS232 as shown.
Navigation: Engineering Home > Interface Buses > Cabled Interface Standards > EIA-366 Specification.
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