im trying to transmit hex array with 9600 8E1 in uart but it seems like weird.

[HKang.4]

I'm using STM32f103C8T6 Blue pill. for IDE is CUBEIDE and using HAL library

​wanna receive data from producted BMS module, then additionally control the mcu by received datas.

BMS communication module setting is 9600 8-Even-1 by 485 communication.

i wanna transmit like unsigned char tx1_tx[6] = {0x02, 0xAA, 0x01, 0xC1, 0x6C, 0x03}

​

I tested using 485 to USB module then, when I check the terminal, it seems like ok for communicating. actually i got the data what i want

(i attatched jpg file)

 

the problem is that using the HAL library and setting 9600 8-E-1 for blue pill, such like attached jpg

Tx data seems like weird. Result is here

 

in hal i write

​unsigned char tx1_data[6] = {0x02, 0xaa, 0x01, 0xc1, 0x6c, 0x03};

in side while

​HAL_GPIO_WritePin(rs485_GPIO_Port, rs485_Pin, GPIO_PIN_SET);

HAL_UART_Transmit(&huart1, tx1_data, 6, 10);

HAL_Delay(5000);

​

what should i do for this problem?

Thanks

[Javier1]

>>what should i do for this problem?

HAL_UART_Transmit(&huart1, tx1_data, sizeof(tx1_data), 100);//for starters

>>485 communication.

485 communication is half duplex, show us what kind of transceiver are you using, did you tested the transceiver alone?(bluepill is 3v3 , is your transceiver cool with that?)

are you getting consistenly the same wrong results?

[gbm]

Delay between activating the transceiver and transfer start?

[Tesla DeLorean]

Config in 9 bit mode to accommodate the parity bit.

ST includes it in the data payload, ie 8+1​