IBM 343 manual Serial Ports, Pin Signal Description

Serial Ports

One serial port is provided on the rear I/O to supply COM2 using an 8-pin RJ45 connector (see Table 13). The COM2 serial port can be used either as an emergency management port or as a normal serial port. As an emergency management port (EMP), COM2 is used as a communication path by the server management software that provides a level of emergency management through an external modem. Figure 37 describes the serial port’s connections.

		Figure 37. Serial Ports A and B
Table 13. Serial Port Connector Pinout
Pin	Signal	Description
1	RTS	Request to send
2	DTR	Data terminal ready
3	TXD	Transmit data
4	GND
5	RIA	Ring indicator
6	RXD	Receive data
7	DSR/DCD	Date set ready / data carrier detect	1
8	CTS	Clear to send
1 Use jumper on server board to select

Technical Reference 93