Envision Peripherals NV3128 manual Operations, Connection Notes

CHAPTER 3 - OPERATIONS

The NV3128 requires no operator intervention. The router may be controlled completely via the selected control system. Section 3.1 discusses the connection algorithms for point-to-point (Level I) and multidrop (Level II) Takes issued by the control system to control the router. Section 3.2 covers the computer-based management unilities.

3.1 CONNECTION NOTES

The Universal Control/Command Interpreter intercepts XY connection commands from the router control system and converts them to connection instructions for the physical crosspoint matrix. The same commands also determine the configuration of the involved I/O ports, controlling or controlled. In their simplest form, the received commands use the following syntax:

New Source -> New Destination

If, for example, the received input specifies "connect I/O port 2 to

I/O port 3," the router does the following two tasks:

1.Configures port 2 as a controlled (the source machine is controlling) and port 3 as a controlling device ( the destination machine is controlled).

2.Sends a control message to the crosspoint matrix selecting the appropriate crosspoint connections to open the forward and reverse data channels. (Note that the forward and reverse data channels can also be set up using the REV SRC/DEST function in UniDiag. See the UniDiag manual for details about this function.)

From the perspective of the control system, an I/O port is a tiered address in the following hierarchy :

MATRIX: ( ignored - or 0 - for all but very large systems)

LEVEL:(0-31)

PORTADDRESS (0-2048 or larger)

Some NVISION routing switches can be divided into physical partitions, each partition consisting of a contiguous range of physical addresses, and each defined as a unique level. However, the NV3128 does not support true partitioning. Rather, a second, "phantom" partition shadows the single physical partition and allows it to be addressed on two logical levels. On the first level, the rules for point-to-point connections apply. A command at the second level will address the same physical ports, but will enact the rules for connections with multiple destinations.

NV3128 RS-422A Machine Control Data Routing Switch 3-3