NXP Semiconductors TWR-IND-IO, Quick Start Manual, Page: 6 / 8

Quick Start Guide
6
Jumper Option
Setting Description
J16 UART3 Isolation/Access Jumpers
1-2
Connects UART3_TX to T1IN on RS-232
transceiver associated with J17
3-4
Connects UART3_RX to R1OUT on RS-232
transceiver associated with J17
5-6
Connects UART3_RTS to T2IN on RS-232
transceiver associated with J17
7-8
Connects UART3_CTS to R2OUT on RS-232
transceiver associated with J17
J18 UART3 RTS/DCD Loopback
1-2 Provides a loopback of RTS to DCD on UART3
2-3 Provides a pulldown on UART3 DCD
J19 UART2 RTS/DCD Loopback
1-2 Provides a loopback of RTS to DCD on UART3
2-3 Provides a pulldown on UART3 DCD
J20 UART2 Isolation/Access Jumpers
1-2
Connects UART2_RX to R on RS-485
transceiver associated with J22/J23
3-4
Connects UART2_TX to D on RS-485
transceiver associated with J22/J23
5-6
Connects UART2_RTS to DE on RS-485
transceiver associated with J22/J23
7-8 Connects UART2_CTS to a pull-down resistor
J21 RS-485 Termination Enable 1-2
Enables 121 Ohm termination between RS-485
A and B
The following is a list of all jumper options. The default installed jumper settings are
shown in white text within the black boxes.
TWR-IND-IO Jumper Options continued
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