@ysong me ayudo bastante su respuesta gracias

hola gente de aceinna necesito leel los datos "a1" como muestro en la imagen pero cuando visualizo los datos con un monitor serial tengo la siguiente imagen necesito decodificar los datos de "a1"en la trama serial de ayuda solo encuentro de "z1" pero no logro encontrar de "a1" por favor alguien podria darme una ayuda para decodificar los datos de "a1" gracias

hello ACEINNA people, I have the OpenIMU300RI and I need to connect to a s7-1200 PLC through the RS232 module of the PLC, I made the connection but the data it shows is not as it says in https://openimu.readthedocs.io/en/latest/software/UARTmessaging.html I have tried with different transmission speeds such as 38400, 57600, 115200, but it does not work, it is supposed to send the 0x5555 data as header but it does not work

so I need to know the following:

1. the communication of the OpenIMU300RI at how many baud is configured by default?.

2.-I DO NOT HAVE THE ST-LINK J-TAG EVALUATION KIT, my question is how can I configure the transmission speed (baud)?
Thank you