Optomux

Optomux is a protocol used by a family of intelligent digital and analog I/O (input/output) units that operate as slave devices to a host computer.

An Optomux I/O unit is a 4-, 8-, or 16-point assembly that accommodates optically-isolated analog or digital I/O modules. Each Optomux I/O unit consists of a removable brain or brain board and an I/O mounting rack. The removable brain or brain board contains a microprocessor which communicates with the host computer and controls the plug-in I/O modules located on the I/O mounting rack.

Analog and Digital I/O Combinations

There are two types of Optomux units: analog and digital. Any combination of analog I/O modules may be plugged into an analog Optomux unit and likewise, any combination of digital I/O modules may be plugged into a digital rack. Analog and digital Optomux units from the SNAP, brick, and Classic rack families can then be combined on the same serial link providing endless combinations of analog and digital I/O points.

Serial Data Link

Optomux I/O units communicate with the host computer over an RS-485 serial communications link. The serial data link is composed of two twisted pairs and a ground (5 wires) that connect to each Optomux I/O unit. It is possible to communicate with up to 256 individual units on a single serial data link for a total of 4,096 digital and analog I/O.

The RS-485 serial data link offers excellent noise immunity and long cable lengths. This can dramatically reduce wiring costs by eliminating the need for bringing large bundles of field wiring back to a central control location. Optomux units can be located where the actual control is needed.

More Information

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