In uart example the protocol used is RS232?

RE: In uart example the protocol used is RS232?

sagarnayakm — Tue, 19 Apr 2022 01:39:52 GMT

Hello,

I doubt regarding the RS232 i mean MAX232, actually i am using app_ble_uart example with 17.0.2 version of SDK and i want ble should be connected continuously and whenever user wants to send the commands from the customized APP the device should receive it and as off now its working fine but at the same time MAX232 has uart connection with TX(P1.3) and RX(P1.4) since from the sensor board the data continuously transmitted to MCU (nrf52840) and based on the data respective action was taken but the problem is whenever i used to connect the sensor data pin to RX pin(P1.4) to MCU its disconnected from the mobile APP so how to achieve this please let me any solution for this.

thank you.

RE: In uart example the protocol used is RS232?

Pablo — Mon, 31 Oct 2016 11:24:32 GMT

Ok. Thank you Sigurd

RE: In uart example the protocol used is RS232?

Pablo — Mon, 31 Oct 2016 11:23:31 GMT

Ok. Thaks a lot!

RE: In uart example the protocol used is RS232?

Sigurd — Mon, 31 Oct 2016 09:43:43 GMT

No, RS232 is not used in the UART example, it uses TTL logic levels (0 - VDD).

With the RS-232 standard a logic high ('1') is represented by a negative voltage (from -3V to -25V), while a logic low ('0') is a positive voltage (from 3V to 25V). So if you want to use RS232, you need to add a RS232 transmitter/receiver, e.g. MAX232.

RE: In uart example the protocol used is RS232?

awneil — Sat, 29 Oct 2016 18:47:36 GMT

To be more precise, To make it RS-232, yo need to add an RS-232 transceiver.

The MAX 232 is just one example of an RS-232 transceiver - many, many alternatives are available.

RE: In uart example the protocol used is RS232?

Nguyen Hoan Hoang — Sat, 29 Oct 2016 14:15:19 GMT

It's logic level. To make it RS-232, yo need to add the MAX 232 chip

RE: In uart example the protocol used is RS232?

Pablo — Fri, 28 Oct 2016 17:36:10 GMT

Oh, maybe yes because sometimes the equipment in the school is not the best. But my question is about the protocol in the serial comunication. I don`t know if is a RS232 protocol or only TTL

RE: In uart example the protocol used is RS232?

Nguyen Hoan Hoang — Fri, 28 Oct 2016 17:27:09 GMT

is your probe set to x10 ? You should see about 3V.