RS-423
| RS423 | |
|---|---|
| Standard | EIA RS-423 |
| Physical Media | Group of copper cables |
| Network Topology | Point-to-point, Multi-dropped |
| Maximum Devices | 10 (1 driver & 10 receivers) |
| Maximum Distance | 1200 metres (4000 feet) |
| Mode of Operation | Single-ended (unbalanced) |
| Maximum Baud Rate | Up to 100kbit/s |
| Voltage Levels | -6V to +6V (maximum) |
| Mark(1) | -4V to -6V |
| Space(0) | +4V to +6V |
| Available Signals | Tx, Rx, GND |
RS/EIA/TIA-423 is a standard for serial communications. It defines an unbalanced (single-ended) interface, similar to RS-232, with a single, unidirectional sending driver, and allows for up to 10 receivers.[1] It is normally implemented in integrated circuit technology and can also be employed for the interchange of serial binary signals between DTE & DCE.
Characteristics[edit]
RS-423 is closely related to the RS-422 standard, both of which used the same overall signaling system, but differed in that 422 had a dedicated return line for every data pin, while 423 used a single return line. Use of a common ground is one weakness of RS-423 (and RS-232): if devices are far enough apart or on separate power systems, the ground will degrade between them and communications will fail, resulting in a condition that is difficult to trace.[2]
RS-423 specifies the electrical characteristics of a single unbalanced signal. The standard was written to be referenced by other standards that specify the complete DTE/DCE interface for applications which require a unbalanced voltage circuit to transmit data. These other standards would define protocols, connectors, pin assignments and functions. Standards such as EIA-530 (DB-25 connector) and EIA-449 (DC-37 connector) use RS-423 electrical signals. The BBC Micro computer used a 5-pin DIN connector. DEC used it extensively with a Modified Modular Jack connector. This was sometimes called "DEC-423".
See also[edit]
References[edit]
- ^ Buchanan W.J. (2004) RS-422, RS-423 and RS-485. In: The Handbook of Data Communications and Networks. Springer, Boston, MA.ISBN 978-1-4757-1067-0 page 627
- ^ National Semiconductor Application Note AN-1031 "TIA/EIA-422-B Overview", January 2000, National Semiconductor Inc. page 2 - evaluate the combination of cable length and data rate.
External links[edit]
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Wikibooks has a book on the topic of: Serial Programming/RS-423 |
| General | |
|---|---|
| Standards |
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| Storage | |
| Peripheral | |
| Audio | |
| Portable | |
| Embedded | |
Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.  Category | |
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