An SA bus supports up to eight network sensors. Figure 1
shows an example of two SA buses, each with eight 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 CGMs, CVMs,
CGEs, CVEs, FACs, FECs, VMAs, XPMs and IOMs
,
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 network sensors
