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The Info List - RS-423


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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
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
RS-422
or RS-485
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[edit]

Electronic Industries Alliance RS-232 RS-485 Profibus Fieldbus List of network buses

References[edit]

^ 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]

Wikibooks has a book on the topic of: Serial Programming/RS-423

RS-423 specification Diagram of pin connections for BBC micro

v t e

Technical and de facto standards for wired computer buses

General

System bus Front-side bus Back-side bus Daisy chain Control bus Address bus Bus contention Network on a chip Plug and play List of bus bandwidths

Standards

SS-50 bus S-100 bus Multibus Unibus VAXBI MBus STD Bus SMBus Q-Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus InfiniBand UPA PCI Extended (PCI-X) AGP PCI Express
PCI Express
(PCIe) Direct Media Interface (DMI) RapidIO Intel QuickPath Interconnect NVLink HyperTransport

Infinity Fabric

Intel UltraPath Interconnect

Storage

ST-506 ESDI IPI SMD Parallel ATA
Parallel ATA
(PATA) SSA DSSI HIPPI Serial ATA
Serial ATA
(SATA) SCSI

Parallel SAS

Fibre Channel SATAe PCI Express
PCI Express
(via AHCI or NVMe logical device interface)

Peripheral

Apple Desktop Bus DCB HP-IL HIL MIDI RS-232 RS-422 RS-423 RS-485 DMX512-A IEEE-488
IEEE-488
(GPIB) IEEE-1284 (parallel port) UNI/O ACCESS.bus 1-Wire D²B I²C SPI Parallel SCSI Profibus IEEE 1394
IEEE 1394
(FireWire) USB Camera Link External PCIe Thunderbolt

Audio

ADAT Lightpipe AES3 Intel HD Audio I²S MADI McASP S/PDIF TOSLINK

Portable

PC Card ExpressCard

Embedded

Multidrop bus CoreConnect AMBA Wishbone SLIMbus

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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