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rs485 communication using SN65HVD485E Half-Duplex RS-485 Transceiver

Sangkwon Han
Prodigy 140 points

hello you guys

thank you very much, i got a lot of helps from you guys.

i have another problem...

i am trying rs 485 COM(completed rs 232 COM).

Using the transceiver, my mcu sends some data like 1 or 2,3 simple number to PC featured with the usbTo485.

when mcu sends 1, pc gets 7f, and in case of 2, pc gets 3f, 3 and 7e etc

i can not figure out the rule between them.

And PC sends some data to mcu, but mcu cannot get the data from pc.

give me some comments and helps

thanks...!

  • 0
    TI__Guru 60865 points
    Hi Sangkwon,

    I think the best debug strategy from here would probably be to observe the SCI pins and RS485 bus lines with an oscilloscope and then manually check some of the transmission frames to determine if things are happening as expected.