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tss721A

sami chehaita
Prodigy 10 points
Other Parts Discussed in Thread: TSS721A

hello every one,

i am working the TSS721A tranceiver with the MSP430 processor to make a m-bus slave.

i used it as marked in the datasheet to develop this circuit below,

but when i send data on the bus from a master i have nothing on the pin TX.

can anyone help me please to find out what could be the problem with this circuit !

note : the processor is powered independently and not using the 3.3Vprovided by the tss721A, and the Mbus_SL_TX and Mbus_SL_RX is connected to the MSP430 UART.

thanks for your help.

  • 0
    Prodigy 10 points

    hi, i don`t know if you have solve this problem, but i found that TXI and TX, RX and RXI should not be connected together, because they they are inverted

    if you have successed in this case, please share your experience, thanks

  • 0
    Guru 227245 points

    I don't think there is a problem wiht TXI connected to RX. The optocoupler does an inversion, so things seem to be connected right.

    Taking as given that the physical connection is correct, there might be a software setup problem. Did you program the ports for USART module usage? (else they are plain GPIO pins)

    A look at your code yould be enlightening.

    Also, there is no 'the MSP430 processor', but a family of ~270 different processors divided into several sub-families. A hint which one you use would be a great help too.

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