SLLA574 March   2022 THVD1406 , THVD1426

 

  1.   Trademarks
  2. 1Enable Pins and Auto-Direction
  3. 2Test Setup
    1. 2.1 Test One: Auto Direction in Action
    2. 2.2 Test Two: Sending Data Below Recommended Operating Conditions
    3. 2.3 Test Three: A System With No Termination
    4. 2.4 Test Four: A System With a Fully Loaded Bus
  4. 3Layout and Package Options
  5. 4Summary
  6. 5References

2 Test Setup

In all the tests, TTL-232R cables from Future Technology Devices International Ltd are used to create the communication link from the PC to the RS-485 evaluation boards (EVM) by converting the USB signal to a UART signal. The communication data is generated by a third-party software (Serial Port Utility) on the PC, which follows the UART protocol with various baud rates. Figure 2-1 shows an example of the UART configuration for 115200 baud rate with a byte format of 8 data bits and 1 stop bit.

GUID-20220128-SS0I-PXV8-5HKD-0TM5DSSDHCMQ-low.png Figure 2-1 Serial Port Utility GUI