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.)
