USB to Serial Converters Manual
Version 2.0
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
27
9 - 10
Pull-up Rx+ to VCC by 750 Ohm Bias resistor. This jumper should be populated to
enable pull-up of Rx+
11 - 12
Pull-down Rx- to GND by 750 Ohm Bias resistor. This jumper should be populated
to enable pull-down of Rx-
13 - 14
Enable CTS Termination with 120 Ohm. This jumper should be populated for RS-
422 mode
Table 5 - Jumpers to select Termination and
Biasing
Note:
If biasing of an RS-485 half-duplex bus is required, enable Rx biasing only (Pull-up Rx+ to VCC by
750 Ohm Bias resistor and Pull-down Rx- to GND by 750 Ohm Bias resistor). Tx biasing should not be used
as this would provide two sets of biasing resistors on the bus. See the notes in section 5.1 before setting
Termination and Biasing
