Doug Fleenor Design NODE2 Manuale - Pagina 4

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Using N

2 ships ready to go, pre-configured for sACN applications. The displays indicate the

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universe number associated with the connector below it (for universes 1 - 99). The UP/DOWN

buttons, if not locked out, adjust the universe number. The buttons are locked when a

connector is plugged in; the connector must be unplugged to adjust the universe number. If an

installation prefers the universe number never be changed, a lock-out jumper can be removed

during installation.

The decimal point in each LED display is the DMX512 signal indicator. It will illuminate if there

is DMX512 data on the network for the selected universe.

Upon loss of DMX512 for the selected universe, N

received DMX512 data for three seconds. It then disables the DMX512 line driver allowing

moving lights and dimmers to reset or to let a Preset10 take control of the line.

2 can accommodate up to six sACN sources transmitting the same universe and will

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output the source with the highest priority. If two or more sources have the same priority,

2 will merge the sources on a Highest-Takes-Precedence basis. A N

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transmitted with the default sACN priority of 100.

Network Jargon

Doug Fleenor Design strives to make our products reliable and easy to use. Computer

networks, and their complexity, complicate this goal. To help our users de-mystify the network

side of our N

products, Mr. Fleenor shares some of his insights.

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Host. Mr. Fleenor finds this networking term misleading. To non-networking people, a host is

the person that coordinates an event (or picks up the tab at a hosted bar). There is often one

host, and many guests. In a computer network, the term host is used for any device connected

to the network that generates or uses data; on a computer network there are many hosts (and

no guests).

The term host, in computer networks, stems from the days when computers took up entire

rooms or floors. Remote terminals, similar to mechanical typewriters, allowed multiple users to

access the computer. The computer hosting these dumb terminals, was the host. Later these

host computers were connected together to form a network, and the term host, for a computer

on the network, stuck.

Node. Every device connected to a computer network is a node: Switches, hubs, routers,

computers, interface devices... Mr. Fleenor likes this term, thus the name of our network

interfaces. Fun fact: All hosts are nodes, but not all nodes are hosts.

Address. A unique address is required for every device on a lighting control network. sACN

(and Art-Net) use IPv4 addressing which is a 32-bit number, typically written in "dot-decimal"

form (four decimal numbers separated by dots) such as 10.0.1.1. There are two parts to the

Address: the network-part and the host-part. To talk to each other, all devices in the network

2 will continue to transmit the last

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Page 4 of 10

2 input will be

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