How to change ASCII code into decimal using simulink block

The data I get from serial port are in form of ASCII And I want to get a decimal form. Please show me an example using Simulink block to change ASCII into decimal. Thanks a lot. ^_^

[Walter Roberson]

Which block are you using to receive the data? The ones I find only deal with bytes in numeric form, which goes along with the fact that native Simulink signals cannot be character type.

[Sibei Liang]

I am using the block "Serial Receive" Data type is "Unit8" http://uk.mathworks.com/help/instrument/serialreceive.html?s_tid=srchtitle

[Sibei Liang]

The data I receive is from an encoder. The voltage indicates the angle. Then I use Simulink to receive this voltage value. I think this value is in form of ASCII, and I just want the numeric ones(48-57)and I am trying to change all the data into a useful decimal. Thank you so much for your help. (^_^)

Answer 1

[Walter Roberson]

In the (unusual) case where the input is a stream of ASCII digits that are all independent from each other, then

input_byte - '0'

converts the ASCII to the corresponding decimal digit.

Or since you are doing it in Simulink, subtract 48.

I say this is unusual because typically when values are encoded as ASCII digits, multiple digits are used to transfer decimal values, either fixed width or space delimited or comma delimited or CR or NL or CR/NL delimited.

[Sibei Liang]

Thank you so much for your answer. You are so nice (^_^)

If the value of ASCII digits are multiple digits. Then how to change ASCII digits into a multiple decimal values.