Reference Schematic Design Considerations

Table 15. RS-485 Reference Schematic Design Considerations
Consideration Notes
Interface The RMC demonstrates how to use the FPGA DIO pins to implement a null-modem RS-485 serial port.
Serial transceiver U6 is the RS-485 serial transceiver that converts between RS-485 and the FPGA signal levels.
Series termination
  • R29 is the series termination for the transceiver. Use series termination at the serial transceiver on all signals being driven to the sbRIO device.
  • All FPGA DIO signals on the sbRIO device include series termination.