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Hardware Layout and configuration
Jumper
JP13
The RS485 communication is supported by RS485 transceiver ST3485EBDR which
connected to pin4 and pin9 of D-type 9-pins connectors CN9 (share same connector with
USART1).
Jumper
SB15,SB18
SB19
SB16
2.9
Touch Sensing Buttons
Two touch sensing buttons are supported on STM32091C-EVAL evaluation board and they
are connected to 3 capacitive sensing channels (PD[12:14]) in group8 with active shield
being connected to 2 capacitive sensing channels (PB11 and PB12) in group6.
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Table 9. RS232 and IrDA Related Jumpers
RS232_RX is connected to RS232 transceiver and RS232 communication is
enabled when JP13 is set as shown to the right (Default setting):
RS485_RX is connected to RS485 transceiver and RS485 communication is
enabled when JP13 is set as shown to the right:
IrDA_RX is connected to IrDA transceiver and IrDA communication is enabled when
JP13 is set as shown to the right:
Table 10. RS485 Related Solder bridges
The external failsafe biasing are enabled when solder bridges SB15 and SB18 are
closed
Default Setting: Not fitted
The bus termination is enabled when solder bridge SB19 is closed.
Default Setting: Not fitted
The AC termination is disabled when solder bridge SB16 is closed for high baud rate
communication.
Default Setting: Not fitted
DocID026902 Rev 2
Description
Description
UM1817
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