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RS-422 cannot implement a true multi-point communications network, such as with RS-485, since there can be only one driver on each pair of wires. However, one driver can fan-out to up to ten receivers. RS-422 can interoperate with interfaces designed to MIL-STD-188-114B, but they are not identical. RS-422 uses a nominal 0 to 5-volt signal ...
RS-485, like RS-422, can be made full-duplex by using four wires. [8] Since RS-485 is a multi-point specification, however, this is not necessary or desirable in many cases. RS-485 and RS-422 can interoperate with certain restrictions. [9] [failed verification]
RS-422 and RS-485 outputs can be implemented as differential TTL. [2] Normal TTL signals are single-ended, which means that each signal consists of a voltage on one wire, referenced to a system ground. [3] The "low" voltage level is zero to 0.8 volts, and the "high" voltage level is 2 volts to 5 volts.
The 2692, 26C92 and 28L92 may be operated in TIA-422 and TIA-485 modes, and may also be programmed to support non-standard data rates. The devices are produced in PDIP-40, PLCC-44 and 44 pin QFP packages, and are readily adaptable to both Motorola and Intel buses.
Because TIA-530 calls for the more common 25 pin connector, it displaced the similar EIA-449, which also uses EIA-422/423, but a larger 37-pin connector. Two types of interchange circuits ("signals" or "leads") between the DCE and DTE are defined in TIA-530: Category I , which uses the balanced characteristics of EIA-422, and Category II ...
Synchronous Serial Interface (SSI) is a widely used serial interface standard for industrial applications between a master (e.g. controller) and a slave (e.g. sensor). SSI is based on RS-422 [1] standards and has a high protocol efficiency in addition to its implementation over various hardware platforms, making it very popular among sensor manufacturers.