PSB Speakers PSB-1688LF M1 user manual COM Port Connector, RS-232 RS-422

Chapter 2 Hardware Configuration

2-4. COM PORT CONNECTOR

COM1 : COM1 Connector, fixed as RS-232.

The pin assignment is as follows :

PIN	ASSIGNMENT
1	NDCDA
2	NSINA
3	NSOUTA
4	NDTRA
5	GND
6	NDSRA		COM1
7	NRTSA
8	NCTSA
9	JNRIA
COM2 : COM2 Connector, selectable as RS-232/422/485.
The pin assignment is as follows :
PIN	ASSIGNMENT
	RS-232	RS-422	RS-485
1	NDCDB	TX-	TX-
2	NRXDB	TX+	TX+
3	NTXDB	RX+	RX+
4	NDTRB	RX-	RX-
5	GND	GND	GND
6	NDSRB	RTS-	NC
7	NRTSB	RTS+	NC
8	NCTSB	CTS+	NC
9	JNRIB	CTS-	NC
10	NC	NC	NC

All COM port’s pin 9 is selectable for RI, +5V and +12V.

For more information, please refer to our “COM Port RI &

Voltage Selection”.

Page: 2-6 PSB-1688LF USER′S MANUAL