Similar to RS422 but is used in multi-point application where up to 64 network devices may be interconnected.
is a standard for half duplex data communications which is frequently used in multi-drop applications. Most commonly this is a 2-wire application. As many as 32 driver/receiver pairs can share a multidrop RS485 network. While many of the characteristics of RS485 are similar to RS422 the voltage range is greater.
Also a serial type of interface but of a balanced nature. Connectors may be 9 pin or 25 pin with non standard pinning patterns. In access control systems used mostly for point to point communications and up to 64 and sometimes even more devices can be interconnected at long distances at high speed.
RS485 is an electrical specification of a two-wire, half-duplex, multi-point serial connection. It offers high data transmission speeds (up to 10Mbit/s), and since it uses a differential balanced line over twisted pair, it can span relatively large distances (up to 4000 feet or just over 1200 meters).
A protocol similar to RS232 which permits data interchange on multidrop networks of up to 32 nodes using a single twisted pair cable. In order for this protocol to be used, each device on a network must have some level of intelligence in order establish orderly data transfer over a single path.
A standard for serial transmission of data between multiple devices. This defines the pin and plug in terms of size, shape and number of pins. An interface based on the RS485 standard.
This standard is similar to RS422A except that the number of possible links is greater and up to 32 senders may be interconnected to as many receivers. This system is particularly designed for local-area networks.
A generic serial communications protocol commonly used to exchange data over long distances between different devices. Less robust than RS232, but employing balanced pairs rather than single conductors as in RS232, meaning they are far more tolerant of a "dirty connection". See also RS232, RS422.
Another EIA protocol for serial communications. Allows several devices to be connected to a single cable, distributed over a wide area. More details are in Issue 32 of Monitor.