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CHAPTER 4: Configuration
Table 4-1. Jumper settings.
Jumper Port RS-232 RS-422/485
E5 2 X
E6 2 X
E7 1 X
E8 1 X
Switch SW4 Settings
To configure the ports on the Dual-Port USB Hub for RS-422/RS-485 instead of
RS-232, select Jumper E7 for Port 1 and Jumper E6 for Port 2. (See Table 4-1.)
When you are running RS-422 or RS-485, you also need to set switch SW4, positions
1 through 10 (see Figure 4-1 and Table 4-2). For example, to set RS-485 2-wire
operation on Port 1, set SW4-1 and 4-2 to ON. For RS-485 4-wire operation,
regardless of the interface, SW4-3 and SW4-8 are always set to ON. Pull-down
resistor (PD) for Port 1 (SW4-4) and pull-up resistor (PU) for Port 1 (SW4-5) can
also be set to ON or OFF for RS-422 or RS-485. Pull-down resistor (PD) for Port 2
(SW4-9) and pull-up resistor (PU) for Port 2 (SW4-10) can also be set to ON or
OFF for RS-422 or RS-485 operation.
Figure 4-1. Switch SW4.
NOTE
Switch positions SW4-1, 2, 3, 4, and 5 are for Port 1. Switch positions
SW4-6, 7, 8, 9, and 10 are for Port 2.
