Intel user manual Hardware Configuration, Assignment, PMB-531LFUSER′S MANUAL, Page

Chapter 2 Hardware Configuration

COM3 : COM3 Connector

COM3 is fixed as RS-232.

The pin assignment is as follows :

PIN	ASSIGNMENT
1	DCD3
2	RX3
3	TX3
4	DTR3
5	GND
6	DSR3
7	RTS3
8	CTS3
9	RI3
10	NC

COM3’s pin 9 is selectable for RI, +5V or +12V. For more information, please refer to our “2-5 COM RI and Voltage Selection”.

COM4 : COM4 Connector

COM4 is fixed as RS-232.

The pin assignment is as follows :

PIN	ASSIGNMENT
1	DCD4
2	RX4
3	TX4
4	DTR4
5	GND
6	DSR4
7	RTS4
8	CTS4
9	RI4
10	NC

COM4’s pin 9 is selectable for RI, +5V or +12V. For more information, please refer to our “2-5 COM RI and Voltage Selection”.

PMB-531LF USER′S MANUAL Page: 2-7