Daktronics DF-1050/1051/1052/1053 - Manual (Page 9)

Introduction 1-3
1.2 Network Concepts
The concept of using LED technology 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.
The Parking Garage displays can be controlled via wire current loop, fiber optic or
manual functions.
Current Loop (DataMaster)
The DataMaster controller connects to the Parking Garage 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.
Current Loop (Signal Converter)
Two types of signal converters can be used in the case of some Parking Garage
displays. In each case the computer connected to the signal computer will be running
custom software for the displays. Refer to Section 3 for additional information and
connections.
In one case, a serial cable connects to the signal converter, and then current loop wire
will run to the display at a maximum length of 300 meters (approximately 1000 feet).
In the second case, a serial cable connects to the first signal converter, and fiber
connects it to a second signal converter. The fiber cable between displays can be up
to 1.2 k (approximately 4000 feet). From the second signal converter a current loop
wire can go another 300 meters to the display.
Manual Control Functions
In some cases, a manual switch box can be wired to the Parking Garage display to
either increment or decrement the number on the display. The switch box is outdoor
rated, and has a maximum length of 300 meters (approximately 1000 feet) from the
display.
1.3 Product Overview
DataTime and DataMaster Parking Garage displays are part of a family of
Daktronics LED digit displays designed for easy installation, readability, and
reliability.
The DataTime/DataMaster Series includes:
• Parking Garage Displays: four-digit displays used for parking locations
requiring a DataMaster, switch inputs or third-party software.
• Gasoline Price Displays: gas price signs with three standard digits, decimal
and 9 /
10
fraction.