Part Number: SN65HVD3082E Other Parts Discussed in Thread: THVD1426 , THVD1406 Tool/software: Hi,
I would like to use this transreceiver in RS485 Modbus protocol, I think this is only possible with auto direction control, Kindly Please suggest possible…
With one PCB alone, the best you can do is loopback testing.
You indeed need to toggle the DE pin to ensure that at most one node is active. The only way to avoid this would be the THVD1406.
Your circuit controls both the DI and DE inputs from the microcontrollers OUTB output, i.e., when OUTB is high, DE is low. This means that the transceiver actively drives only a low signal; for a high output, the driver is deactivated, and the circuit…
That would not be possible. Having DE always high works only for a unidirectional connection with exactly one transmitter. With two transmitters (microcontroller and sensor), you need to control DE. Alternatively, use a transceiver with auto-direction…
Only the THVD1426 and THVD1406 have auto direction control. If these two devices do not fit your requirements, then you cannot use auto direction control.
(And there is no connector named "DB9".)
Not driving the bus for a high UART_TX signal will greatly reduce the noise margin.
Consider using a transceiver with auto-direction control like the THVD1406.
The app note below shows how you can make an auto direction circuit which requires one additional IC.
https://www.ti.com/lit/ug/tidubw6/tidubw6.pdf?ts=1701204863727&ref_url=https%253A%252F%252Fwww.google.com%252F
Otherwise, you can look at an auto…
Part Number: THVD1400 Other Parts Discussed in Thread: THVD1406 Hi team:
Can you help to review attached SCH for the Auto RX TX issue at 115200 baud rate?
but 9600 baud rate works well here. tks for your comments.
THVD1400-RS485 issue.docx
Part Number: TRS3232E Other Parts Discussed in Thread: THVD1426 , THVD1406 Hi,
Plesae kindly advise if there are any deivce to i mplement the RS232 to RS485 interface, or there are any soluton to realize it, thanks.
Other Parts Discussed in Thread: THVD1426 , THVD1406 , THVD1454 , THVD1420 , THVD1400 , THVD1410 Dear Experts,
Currently, i have used the below design for RS485 to TTL with auto flow control(74HC), now i have the plan to redesign my converter with ti RS485 converters…
