Connect Tech Xtreme/SBC PCIe/104 Single Board Computer and PCIe/104 Qseven Carrier Board - User Manual
Revision 0.02
17
Description
Two RS232 serial ports are provided on P9 and two RS485 serial ports are provided on P11.
For the RS485 ports, the default configuration is full duplex without any bias or termination. Various
resistors configurations can be populated to enabled TX and RX termination as well as RTS control. The
following diagram shows the available configuration options. Contact Connect Tech’s support department
for further information.
Resistor
Function
Default
R99
Always enable driver
Populated
R101
Always enable receiver
Populated
R156
RTS controlled receiver
R160
RTS controlled driver
R98
Receiver termination
R102
Driver termination
R100
Receiver bias
R97
Receiver bias