Omega OMG-USB-SER-2 - Manual (Page 7)

Configuration
OMG-USB-SER-2 Page 4
Configuration
Original configuration
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.
Electrical Interface Selection
Each of the two ports on the OMG-USB-SER-2 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.