Technical Reference Manual – SB-293
Printing Date
01838-002 Rev. 3.0
July-1998
Page 11 of 32
Wiring the Satellite Board
There are several things to keep in mind when wiring the satellite board.
DO
•
Route cables in accessible areas whenever possible for ease of maintenance.
•
Add transient suppression across electric devices attached to satellite board output relays.
•
Use an isolation relay (Keri Systems p/n IRP-1) if connecting to a parking gate, turnstile, or
any application using a large electric motor.
•
For a single door application, install the door's reader to the TB-5, "A" reader connection on
the controller.
•
For a two door application, install the primary door's reader to the TB-5, "A" reader
connection on the controller and install the secondary door's reader to the TB-6, "B" reader
connection on the receiver board.
DO NOT
•
Stretch or over-tension cables.
•
Route cables over sharp objects.
•
Let the cables and the individual wires get tangled.
•
Route cables near EMI sources. Cables can act as antennas, receiving EMI that can affect
controller performance.
Understanding Inputs and Outputs
The following section provides descriptions of the Inputs and Outputs on the SB-293 Satellite Board.
Possible wiring diagrams for inputs and outputs are included in the next section, Wiring Connections,
which begins on page 15.
The Satellite board has eight inputs and four outputs available for configuration. If the Satellite Board
is configured for two-door operation, two inputs and two outputs are dedicated to specific functions.
One input is dedicated for the door status switch and one input for the Request to Exit input. One
output is dedicated for the Lock Relay and one output for the Alarm Relay. Through programmable
features in the
Doors32
™ program, the remaining two outputs can be dedicated to Door Held Open
alarms for the A- and B-doors, and one input can be dedicated to an Auxiliary RTE input for the B-
door. The remaining inputs and outputs may be used for general purposes. If the Satellite board is
configured for general inputs and outputs, all eight inputs and all four outputs are available for
general-purpose use.
Inputs
An input detects a state change generated by a device outside of the controller. The controller then
responds to that state change. The input devices that generate the state change may be normally
closed or normally open.
A normally closed input device continually keeps a circuit active or complete. A state change is
generated when the normally closed input device is forced open, breaking the circuit. In an access
control system, a door switch is a typical example of a normally closed device. While the door
remains closed, the switch remains closed. When someone opens the door, the door switch is
opened, breaking the circuit and generating a state change. The controller then responds to this state
change and generates an output (such as sounding an alarm if the door is a secure door).
A normally open input device continually leaves a circuit open or incomplete. A state change is
generated when the normally open input device is forced closed, completing the circuit. In an access
control system, a request-to-exit (RTE) button is a typical example of a normally open device. In an
access control installation, an RTE button is located on the secured side of the door. While there is no
one there pressing the button, the switch remains open. When someone desires to exit through a
secure door, they press the RTE button, closing the circuit and generating a state change. The
SYSTEM INSTALLATION
