An SA bus supports up to four network sensors. Figure 1
shows an example of two SA buses, each with four network sensors.
Note: Do not mix
RJ-style modular (phone) jack and screw terminal devices on the SA bus. Due to the
permanent internal SA bus EOL termination contained in
C4-CGMs, C4-CVMs, CH-PCAs,
CH-PCGs, CH-PCVs, and CH-PCXs
, using both the phone jack and terminal block
effectively puts the EOL termination in the middle of the SA trunk, creating a star
network configuration. This configuration violates the RS-485 network wiring
guidelines and can cause unpredictable communication problems.
Some NS Series Network Sensors and NS Series Discharge Air Sensors models are DIP switch addressable.
Figure 1. SA Bus Example Showing Multiple Networks Sensors
