User's Manual

28
Figure 2.4 – System Surge Protection
The communication wires running from the pluggable termination blocks on the
PCU’s bottom din-rail to the system surge protection devices are connected to
provide three independent serial connections:
1. Command and Control Bridge
2. Dedicated communications for sensor A detection calls
3. Dedicated communications for sensor B detection calls.
One serial connection is an RS-485 Bridge that enables a multi-drop shared
communication bus between all sensors on the panel. In a Wavetronix stop bar
detection system, the Bridge connection is designed for command and control of all
SmartSensor Matrix units, rack cards, and other connected Click! devices. This bus
is formed by wiring the C and D terminal blocks and landing the system surge
devices on a shared T-BUS.
Note
If the DC Surge OK LED is not lit up when the Click! 222 is powered, call
Wavetronix Technical Services for assistance.