WIZnet Developer Forum

UART HW control

Hello,

I have managed to communicate between MCU and wizfi250 and an android app.
If I use UART with no hardware control (not connecting the RTS,CTS pins) the devices communicate well.

If I set the MCU and wizi to have H/W control in order to use the RTC and CTS pins, then the devices communicate even if the CTS and RTS pins are not connected!
Should not the communication have failed if the pins are left unconnected? Is uart with HW control work even with no CTS , RTS connection?

Thank you,

Best Regards,

Andreas Achilleos

Hi Andreas Achilleos.

WizFi250 can support HW flow control via CTS and RTS pins. But I don’t know what is your problems. because of the lack of explanation.

Thanks.

Hello,

Thank you for your reply.

I mean that I have set both MCU and wizfi to operate with H/W control and when I connected the 2 devices they could “talk” even with CTS,RTS pins unconnected!
Is this possible?

Thank you

Hi Andreas Achilleos.

AS I said WizFi250 can support CTS, RTS pins. But it is not required to use it.
You can use a Simple UART(TX, RX, VCC,GND), not use CTS, RTS.
So, Communications between MCU and WizFi250 are possible even though CTS, RTS pins unconnected.

Thanks.

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