The value being received is correct - what the symbol looks like (i.e. a y with dots of a ?) is due to Windows Locale interpreting the character and should not be used to determine if it is the correct variable

Use the GetByteAt() command or GetByte() command to return the ascii ordinal value.

*Note: I removed the other duplicate post. We can use this one

Thanks DJ I should have tried that first. I appreciate your patience.

I just tried your suggestion and I received the value 63 which is the code for " ? ". I believe there may be a bug in the EZ Scipt.
The following is from the console after running the script.

Start 1: $handshake=GetAsByte(255) 2: $AX_ID=GetAsByte(14)
3: $length=GetAsByte(7) 4: $AX_Write_Data=GetAsByte(3) 5: $table=GetAsByte(30) 6: $LSB=GetAsByte(188) 7: $MSB=GetAsByte(2) 8: $LSB2=GetAsByte(30) 9: $MSB2=GetAsByte(0) 10: $checksum=GetAsByte(237) 13: $test=$handshake+$handshake+$AX_ID+$length+$AX_Write_Data+$table+$LSB+$MSB+$LSB2+$MSB2+$checksum 18: UARTWrite(0,1,$test) 28: $x = UartAvailable(0, 1) 30: print("Bytes in buffer: " + $x) > Bytes in buffer: 11 32: $RX_DATA = UARTRead(0, 1, $x) 34: print("Received: " + $RX_DATA) > Received: ?? 36: $Data_0=GetByteAt($RX_DATA,0) 37: $Data_2=GetByteAt($RX_DATA,2) 39: Print ($Data_0 +" "+ $Data_2) > 63 14 # 63 is the question mark and 14 is the correct number Done (00:00:00.4523841)

Do you have a logic analyzer? I believe it might help you diagnose the issue.

If you would like to experiment without a Logic Analyzer, you can use the Serial Terminal (EZB) found in the General section of Project -> Add Control

What device are you connecting to?

I'm using the EZ-B port D5 and sending it to the Dynamixel servo, ID14 and using a return data line to the EZ-B port D6.

I just sent the same instruction from D5 to D6 without the Dynamixel servo and received the same result.

There are no issues if a send text with quotation marks its only when I send unsigned char.

I did a little research.

I think you have data framing issue within the coding for the EZ Script. Check the settings for the data frame size and or the parity and stop bits.

The EZ-B has no data framing issues in our testing. And unless there is a physical defect with the STM32 ARM Processors, the UARTs are working as expected. The ez-b firmware has all UARTs set for...

  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

Perhaps your wire has line noise. Can you show me a logic analyzer screenshot of the framing error you are referring to?

Also, keep in mind that your script is constantly Initializing the UART in the first line of code. You only need to initialize it once - perhaps in a different script or Connection Script?

Every time you run the code the UART is being physically re-initialized. That's like starting and stopping your car's engine at every street light.