Switch Examples; Figure 2: Rs422/485 Interface Configuration - Omega OMG-USB-SER-4 User Manual

Switch Examples

SW1
485 3
NE 3
485 4
NE 4

Figure 2: RS422/485 Interface Configuration

485 Mode Selection
OFF : 422 Mode
The transmitter lines TX+ and TX- are always driven
ON : 485 Mode
The transmitter lines TX+ and TX- are switched to high
impedance when the device is not actively transmitting data
NE 485 option, OFF for 422
OFF : The receiver is always enabled.
receiver will echo back all transmitted data.
ON : The receiver is disabled when the transmitter is enabled. In a
two-wire setup the receiver will not echo back transmitted data.
Note: Switch positions 1 and 2 are for port 1 and switch positions 3 and 4 for port
2 on SW3. Switch positions 1 and 2 are for port 3 and switch positions 3 and 4 for
port 4 on SW1.
OMG-USB-SER-4
Configuration
SW3
485 1
NE 1
485 2
NE 2
In a two-wire setup the
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