Cisco Cisco HyperFlex HX220c M4 Node Data Sheet

The pinout details of the rear RJ-45 serial port connector are shown in 

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8

Pin

Serial Port (RJ-45 Female Connector)

Signal

RTS (Request to Send)
DTR (Data Terminal Ready)

TxD (Transmit Data)

RxD (Receive Data)
DSR (Data Set Ready)

CTS (Clear to Send)

GND (Signal Ground)
GND (Signal Ground)