USB to Serial

ID #1105

How can I configure USB-COM-I for RS485/RS422 mode?

Inside the unit, there is only a header block (old configuration) or a header block and a DIP-Switch (new Configuration) which is used to select the mode of operation. You will need to open up the plastics or metal covers, and set the jumper setting and/or DIP-switch to RS-422 mode or RS-485 mode as per the requirements of your application. After the setting of jumpers and connecting power supply to the adapter, you then plug the adapter to USB port to start driver installation.

Old Configuration New Configuration
Jumper Block DIP Switches Jumper Block
old jumper new dip switch new jumper



RS422 Mode Configuration
Old Configuration New Configuration
Jumper Function Jumper Function
1-2 TxD / RxD Termination of 120 Ohm 1-2
10-11		 TxD / RxD Termination of 120 Ohm
3-4 CTS / RTS Termination of 120 Ohm 19-20 CTS Termination of 120 Ohm
9-10 TxD Driver Always ON DIP-Switch ON ON ON
13-14 RxD Driver Always ON    
17-18 CTS Handshaking    


RS485 Half Duplex No Echo Mode Configuration

Old Configuration New Configuration
Jumper Function Jumper Function
1-2 TxD / RxD Termination of 120 Ohm 1-2 TxD / RxD Termination of 120 Ohm
5-6
7-8		 TxD / RxD Single pair
 DIP-Switch OFF OFF OFF
11-12 Enable TxD Driver only when transmitting    
15-16 Transmit Data Echo Suppression Mode
    
19-20 CTS always enabled    

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Last update: 2016-02-18 16:49
Author: ipc
Revision: 1.3

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