Envision Peripherals manual A Solution, NV3128 RS-422A Machine-Control Data Switch

Video equipment offers a sufficient diversity of control options to add another layer of complexity to routing.

The Sony BVU machines have a single D connector for both controlling and controlled traffic. The direction of data traffic is controlled by the remote switch.

The Sony BETA machines hard wire two D connectors together, again for both controlled and controlling traffic. Although the second connector facilitates daisy-chained control, it does nothing to diminish the probability of bus contention this feature invites.

D1 and D2 VTRs use two D connectors, configurable with software as controlled or controlling. Additionally, these machines can resolve their involvement in bus contention in a daisy-chained control configuration.

Traditionally, installations have resorted to relay routers or analog audio routers to switch machine control data, and have just had to tolerate the limitations and expense caused by the logistical complexity. Analog audio routers and relay routers share three further disadvantages: They take up a lot of space, they use a lot of electricity and they cost a lot money.

A SOLUTION:

The NV3128 fully addresses the idiosyncrasies of routing RS-422A machine control data. Its compact, eight rack-unit frame is small enough to be installed in the suite. Its 65 watt off-the-line power requirement is less than most light bulbs. And its cost is a fraction of alternative solutions. Capable of NRZI data rates up to 5 Mbits/Sec., it offers 128 I/O ports in a non-blocking X-Y matrix. It is also available in a 64-port configuration that can be field upgraded to 128 ports by simply adding an additional I/O module.

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