Daktronics DF-12xx - Manual (Page 13)

Introduction 1-3
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. The
common thread of most requests is a means of programming and controlling the
displays in a variety of ways.
There are three communication methods available: Current Loop, Radio, and
Modem.
Current Loop
The DataMaster controller connects to the Gas Price 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 (Gas Price Display Operation)
for additional information.