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How to configure RS422 and RS485 on the SD4001? The SD4001 has one DB9 serial port that can selected to be an RS232, RS485 or RS422 port. By default the SD4001 is configured in RS232 mode (with a vertical jumper in place on the left hand SEL pins). 
To set the port in RS422 or RS485 mode you must remove the SEL jumper and then configure the Signaling Protocol using the Management Console. The DB9 pin-out is: 
RS-422 uses a full duplex transmit on TX+ (ransmit Data +) / TX- (Transmit Data -) pair, receive on RX+ (Receive Data +) /R X- (Receive Data –) pair. RS-485 uses half duplex over single pair. For RS-485 which is a 2-wire bus that drives D+ and D- from a native 4-wire interface you need to loop 3-6 and 2-7 on the DB-9. |
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