NPC-88 series RJ-45 ports to DB9 male serial cable.

DB-9M Pinout	Signal	RJ-45	Signal	Connectors
1	DCD	1	DSR
2	TXD	2	RTS
3	RXD	3	GND
4	DSR	4	TXD
5	GND	5	RXD
6	DTR	6	DCD
7	CTS	7	CTS
8	RTS	8	DTR
9	Not Connected