Daktronics DF-1030 - Manual (Page 9)

1.1 Safety Precautions
Important Safeguards:
1. Read and understand these instructions before installing your
display.
2. Do not drop the controller or allow it to get wet.
3. Properly ground the display with a ground rod at the sign
location.
4. Disconnect power when the display is not in use.
5. Disconnect power when servicing the display.
6. Do not modify the display structure or attach any panels or
coverings without the express written consent of Daktronics,
Inc.
1.2 Network Concepts
The concept of using LED displays as a cost effective, high impact method of
communication is rapidly growing throughout many industries and businesses.
There are three communication methods available: Current Loop, Radio, and
Modem.
Current Loop
The DataMaster controller connects to the Rate Display either from a j-box located
outside near the display or from an indoor location. The communication method is
current-loop to the host display, and from the host to the client. Current-loop is a
standard communication method that uses a maximum cable length of 600 meters
(approximately 2000 feet). Refer to Section 3 for additional information and
connections.
Radio
The radio network is a standard communication method that uses radio waves at high
frequencies to transmit signal. The radio network has a maximum distance of 450
meters (approximately 1,500 feet). A nearly straight line-of-sight path must be
maintained between the Server Radio connected to the DataMaster controller,
through a signal converter, and the Client Radio connected to the display. Refer to
Section 3 (Electrical Installation) and the Section 5 (Rate Display Operation) for
additional information.
Modem
The modem is a standard communication interface that utilizes standard phone
transmission lines. The phone company assigns each phone line a number that the
modem uses to communicate between DataMaster and display. Each modem
network needs to have a dedicated phone line assigned to it. Refer to Section 3
(Electrical Installation) and the Section 5 (Rate Display Operation) for additional
information.
Introduction 1-3