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DUAL- AND QUAD-PORT USB HUBS
each port. When selecting a configuration for your Hub, refer to Tables 4-6
through 4-8 and Figures 4-5 and 4-6.
Jumpers E1, E2, E3, E4, E5, E6, E7, and E8
To configure Port 1 on the Quad-Port USB Hub for RS-232, select Jumper E8 on
the circuit board. To configure Port 2 for RS-232, select Jumper E5. To configure
Port 3 for RS-232, select Jumper E4, and for Port 4, select Jumper E1. (See Table
4-6 for all the jumper settings.)
Table 4-6. Jumper settings.
Jumper Port RS-232 RS-422/485
E1 4 X
E2 4 X
E3 3 X
E4 3 X
E5 2 X
E6 2 X
E7 1 X
E8 1 X
Switch SW2 and SW4 Settings
To select RS-485 mode (4-wire or 2-wire operation) or RS-422 mode (4-wire
operation), as well as termination, pull-up resistance, and pull-down resistance, set
the DIP switches labeled SW2 and SW4 on the circuit board. (See Figure 4-5 and
Table 4-7.)
