Can I connect an NJ-series Controller to an NSJ-series Controller via Ethernet or a serial port?

Yes, you can use either an Ethernet or a serial connection to connect these two Controllers. To use an Ethernet connection, use the EtherNet/IP port. The NSJ-Controller must have an Ethernet port, e.g., it must have the following model number: NSJ5-[ ]Q11-[ ][ ][ ]. To use a serial connection, you need to install a Serial Communications Unit in the NJ-series Controller. The area you can access is limited to the memory used for CJ-series Units.