Black Box RS422/485 manual Port Description RS-485, QUAD-PORTUSB HUB-RS-232/422/485 IC1022A

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

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