NSTAR SERIAL COMMUNICATION Standard configuration uses two communication ports. Control one NS2 control panel per communication port.
NSTAR RS485 COMMUNICATION Standard configuration uses two communication ports for two loops. Control 31 NS2 control panels per loop, 62 NS2 panels total.
NSTAR ETHERNET COMMUNICATION
Where one NS2 panel is used per IP loop, communicate via optional on-board Ethernet interface (NSLAN1). One NS2 per NSLAN1. Where multiple NS2 panels are required per IP loop, communicate using RS485 communications (N485PCI2L & LANSRLU1).