Daktronics AF-3020-7.6-R,A - Manual (Page 9)

The label “A” on a drawing typically denotes an assembly. An assembly can be a single circuit board
or a collection of components that function together, usually mounted on a single plate or in a single
enclosure. Assemblies are divided into two types: those that route signal and those that route power.
In addition, the following labeling formats might be found on various Daktronics drawings:
· “TB??” denotes a termination block for power or signal cable.
· “F??” denotes a fuse.
· “E??” denotes a grounding point.
· “J??” denotes a power or signal jack.
· “P??” denotes a power or signal plug for the opposite jack.
Finally, Daktronics part numbers are commonly found on drawings. Those part numbers can be used
when requesting replacement parts from Daktronics Customer Service. Take note of the following
part number formats:
· “0P-????-????” denotes an individual circuit board, such as a driver board.
· “0A-????-????” denotes an assembly, such as a circuit board and the plate or bracket to which it is
mounted. A collection of circuit boards working as a single unit may also carry an assembly label.
· “W-????” denotes a wire or cable. Cables may also carry the assembly numbering format in
certain circumstances. This is especially true of ribbon cables.
· “F-????” denotes a fuse.
0P-1195-0001
SN: 6343
05/19/99 REV.1
Figure 4: Typical Label
Most circuit boards and components within this sign carry a label that
lists the part number of the unit. If a circuit board or assembly is not
listed in the replacement parts list in Section 4, use the label to order
a replacement. A typical label is shown in Figure 4. The part number
is in bold.
1.4 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 reasons for this growth are many,
but the need for additional features and complexity of multiple sign installations has emerged, and
Daktronics display systems have been designed to meet those needs. The common thread to most
client requests is a means of programming and controlling a group of signs from a central control
point. Daktronics responded by developing a powerful system of interconnecting and controlling
signs. One network of signs can consist of a maximum of 240 signs. Great care has been taken to
design products that will satisfy a wide variety of installations. Some of the design goals of these
systems include the following:
· Easy transfer of messages
· The ability to tell a sign or group of signs in a network which message should be run
· The ability to determine the status of any sign on the network
· The ability to control multiple sign technologies on the same network
There are four network systems available: RS/232, RS/422, modem and fiber optic.
RS/232 Network
RS/232 (EIA/TIA-232-E) is a standard communication interface that employs a single-ended
serial transmission scheme that uses a maximum cable length of 8 meters (25 feet). This interface
was designed for computer communication at short distances. All computers have an RS/232
communications port. Refer to Section 3 for additional information.
Introduction 1-3