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 (similar to RS-422). It is normally implemented in integrated circuit technology and can also be employed for the interchange of serial binary signals between DTE & DCE. There is no common pinout for RS-423. 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".
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. In this respect, balanced serial connections such as RS-422 or RS-485 are better,[1] and Ethernet over twisted pair connections are better yet, because of the galvanic isolation provided by the signal transformers.
See also
References
- ^ 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
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