17
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 Q
UAD
-P
ORT
USB H
UB
—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
