SN65HVD1473: Difference between SN65HVD1473D & SN65HVD73D

Hi Karthik,

I would expect these two devices to behave very similarly, since the only difference between them is the ESD rating. If you could describe the issue a bit more maybe we can help you figure out the cause. Have you tried checking the RS-485 and logic (D/R/DE/RE) interfaces on an oscilloscope to make sure the transceiver is working as expected?

Regards,
Max

Hi Max,

Here the issue is that I have made the full duplex IC into half duplex mode where I have shorted A to Y, B to Z also the RE# and DE pin is shorted and gave one GPIO to control it .

But Now I am able to receive the data in RX pin but the data transmitted in TX pin is not received in the destination, I have probed it and also checked.

It was working fine in SN65HVD1473 IC now i replaced it with SN65HVD73 

Am not able to make out what is the issue.Canyou please help me out?

Regards,

Karthik

Karthik,

Can you please show us the screenshot from when you probed the lines? Since the issue is related to the transmit functionality, it would be interesting to look at the D pin at the same time as the A and B pins on the transmitting node to see whether or not there is a bus output that matches the logic input. If the output does not toggle at all, then check the DE pin. If it toggles, you can see whether or not the waveforms show some impairment (like if they are attenuated due to loading, etc.). If the waveforms look OK at the transmitter, I would then check the same signals at the receive end to make sure the signals are making it across your cable successfully.

Max