Introduction
2
Product Description
The SI-32 is a 32 input message selector for Daktronics DataTrac
TM
and Galaxy
®
displays.
This unit provides 32 optically isolated inputs. Two SI-32 units can be chained together to
provide for a total of 60 isolated inputs.
The 32 input switch interface (SI-32) controls what preprogrammed messages, created
using the Venus
®
1500 Software, appear on the display. These messages must exist at
the display for the SI-32 to run them. Refer to the proper display manual for questions
regarding the display. Refer to the
Venus
®
1500 Software Manual
for information on
message editing.
Definitions
BCD:
A BCD (Binary Coded Decimal) is a switch with multiple contacts. When a number is
selected, the corresponding BCD combination of contacts is closed.
Momentary:
Momentary is a type of switch with two terminals and one movable contact.
When the switch is depressed, the contact closes the two terminals. When the switch is
released, the contact opens the two terminals
Network:
A network consists of multiple displays connected to each other. Up to 240
Venus
®
1500 controlled displays can exist on one network.
RS232:
RS232 is a standard PC communication type with a maximum cable length of 25
feet (7.62 meters).
RS422:
RS422 is a standard differential communication type with a maximum cable
length of 4000 feet (1.2 kilometers).
Sign Address:
The sign address is an identification number assigned to each sign of a
network. The Venus
®
1500 Software uses the address to locate and communicate with
each display. Signs on the same network cannot use the same address.
SPDT
: A SPDT (Single Pole, Double Throw) is a type of switch action found on many types
of switches. A SPDT switch has three (3) terminals and one movable contact that make a
connection between two (2) terminals at a time. A SPDT switch controls two circuits.
Figure 2:
SI-32 Switch Interface