Omega Four Port RS-232/422/485 to USB Adaptor Manuale Utente

OMG-USB-SER-4 

Page 4 

 
This device ships with the following configuration. 
422 mode,  
120 ohm termination,  
1K ohm pull up on RX+ 
1K ohm pull down on RX- 
 
In order to change this configuration the box must be opened. Do this by 
removing the four screws located on the bottom. When reassembling please note 
that the top and bottom are keyed to fit in only one direction. 
 

Each of the four ports on the  OMG-USB-SER-4 can be individually configured 
as an RS-232, RS-422, or RS-485 interface. This is selectable via the DIP switches 
and DIP shunts. Each of the switch positions is described on the following page.