CHAPTER 4: Configuration
Figure 4-4. RS-422/485 interface configuration.
NOTE
Switch positions SW3-1 and 2 are for Port 1, SW3-3 and 4 are for Port 2,
SW1-1 and 2 are for Port 3, and SW1-3 and 4 are for Port 4.
Table 4-5. DIP-switch SW1 and SW3 settings.
Switch | Switch | Port | Description | | | RS-485 | RS-422 |
Setting | Number | | | | | | |
| | | | | | | | |
485 | SW1-1 | 3 | 485 | Mode (4-wire) | | ON | OFF | |
NE | SW1-2 | 3 | 485 | Mode, No Echo (2-wire) | ON | | OFF | |
485 | SW1-3 | 4 | 485 | Mode (4-wire) | | ON | OFF | |
NE | SW1-4 | 4 | 485 | Mode, No Echo (2-wire) | ON | | OFF | |
485 | SW3-1 | 1 | 485 | Mode (4-wire) | | ON | OFF | |
NE | SW3-2 | 1 | 485 | Mode, No Echo (2-wire) | ON | | OFF | |
485 | SW3-3 | 2 | 485 | Mode (4-wire) | | ON | OFF | |
NE | SW3-4 | 2 | 485 | Mode, No Echo (2-wire) | ON | | OFF | |
| | | | | | | | |
NE = No Echo. In a two-wire setup, the receiver will echo back all transmitted data.
4.2.3 QUAD-PORTUSB HUB—RS-232/422/485 (IC1022A)
You have a variety of configuration options for the four DB9 ports on the Quad- Port USB Hub. You can set all ports as RS-232, all ports as RS-422, all ports as RS- 485, or any combination of these interfaces. You also need to select termination (ON or OFF) for each port, and pull-up and pull-down resistors (ON or OFF) for
