EIA/TIA-449; General Purpose 37-Position Interface for Data
terminal Equipment and Data Circuit-Terminating Equipment Employing
Serial binary Data Interchange |
Pin | Signal name | Signal Function | Pin | Signal name | Signal Function |
1 | Shield | Ground | - | - | - |
2 | Sec Receive Ready | Control from DCE | 6 | Receive Common | Ground |
3 | Sec Send Data | Data to DCE | 7 | Sec Request to Send | Control from DCE |
4 | Sec Receive Data | Data from DCE | 8 | Sec Clear to Send | Control from DCE |
5 | Signal Ground | Ground | 9 | Send Common | Ground |
RS-449, 37-pin connector Pinout and Signal names
Normally EIA422 and 423 systems may not be connected together. EIA-449
cabling of 422 sends and receives data as differential pairs and control
signal as single-ended, but for 423 cabling it sends and receives
single-ended data and control signals. Receiving the single ended signal
in 423 is accomplished by grounding the 'B' side of the differential
receiver at the connector. |
EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver with multiple receivers (up to 10). "..Specifies the electrical characteristics of the unbalanced voltage digital interface circuit, normally implemented in integrated circuit technology, that may be employed when specified for the interchange of serial binary signals between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) or in any point-to-point interconnection of serial binary signals between digital equipment." 'Telecommunications Industry Association'. EIA-423 is used in EIA-449 and EIA530, both of which define the cabling and pin-out to form a complete interface.
ANSI/TIA/EIA-423-B-96 Electrical Characteristics of Unbalanced Voltage Digital Interface Circuits
Electronic Industries Alliance {EIA}, has disbanded in 2011
Telecommunications Industry
Association {TIA}, www.tiaonline.org
EIA-449 is a cable bus. The specification only define the physical
interconnect, the electrical interface is defined in other documents. In
this case EIA-422, EIA-423, EIA485, and EIA-232 define the electrical
interface [ICs].
For a listing of Interface or driver IC manufacturers refer to one of the
following electrical pages [located on this site]:
RS-232 Bus description, the RS-422 / RS485 Cable Bus, or the RS-423 Cable Bus
Home | |||||||
Distributors | Components | Equipment | Software | Standards | Buses | Design | Reference |