Compaq MPAC-18 manual Serial Jack, RS232 & RS485 RS232 Jack, RS485 Jack

Table 7 Serial Jack, RS232 & RS485

RS232 Jack

DB9 Pin	Assignment	RS-232C	Direction
		Name
1	DCD	CF	In
	(Data Carrier Detect)
2	RX	BB	In
	(Receive Data)
3	TX	BA	Out
	(Transmit Data)
4	DTR	CD	Out
	(Data Terminal Ready)
5	GND	AB	GND
	(Signal Ground)
6	DSR	CC	In
	(Data Set Ready)
7	RTS	CA	Out
	(Request to Send)
8	CTS	CB	In
	(Clear to Send)
9	RI	CE	In
	(Ring Indicator)

RS485 Jack

DB9 Pin Assignment Direction

1	NC
2	Rx-	In
3	Tx+	Out
4	NC
5	GND	GND
6	NC
7	Tx-	Out
8	Rx+	In
9	NC

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MPAC-18 Manual