How to convert system.string to uint8?

I'm using .NET to read FTDI usb uart serial data.
The following method:
str = System.String('create a System.String');
[r str] = Read( fo, BytesToRead, BytesReceived);
arr = (uint8(char(str)))
results to 'arr' maximum value is 127.
How to pass system.string values between 127..255 (uint8)? Or is there better conversion method for system.string variables to uint8?

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on 23 Dec 2017

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