Daktronics GENERIC GALAXY AF-6200 Series, Руководство пользователя

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Introduction
2
Network Concepts
Daktronics offers four network systems: RS232, RS422, Ethernet, fiber-optic Ethernet, and
cellular modem to interconnect and control displays. One display network can comprise
up to 240 displays. Each Daktronics system is capable of performing multiple functions,
including:
• Transferring messages.
• Programming messages to play on a display or group of displays in a network.
• Determining display statuses on a network.
The Daktronics AF-6200/6300 displays use one of the following communication methods.
Refer to the Signal Termination from Computer to Display (p.7) section for more
detailed information.
RS232
RS232 (EIA/TIA-232-E) is a standard communication interface that employs a single-
ended serial transmission scheme using a maximum cable length of 25' (7.62 m). This
interface is designed for computer communication at short distances. Most computers
have an RS232 communications port.
RS422
RS422 (EIA/TIA-422-B) is a standard communication interface that uses a differential
balanced transmission scheme typically using a maximum cable length of approximately
4,000' (1.2 km). The main advantage of RS422 over RS232 is a longer cable length. A
signal converter is needed to convert the computer’s RS232 signal to RS422.
Ethernet
An Ethernet network is a standard communication method that allows one computer,
or a number of computers, to connect to displays. Each primary display is identified by
a unique address. This address allows the computer to communicate directly with each
primary display.
Fiber-optic Ethernet
A fiber-optic network is a standard communication method transmitting light (signal)
through glass fibers. Fiber-optic cable has a maximum length of 2,000' (0.6 km). A signal
converter is required to convert the computer’s Ethernet interface to a light signal, and
another to convert the light signal to Ethernet within the display.
Cellular Modem
A cellular IP modem provides a wireless communication network between the display
controller and the remote central software. It can send and receive data using cellular
technologies provided by the cellular carrier.