Handling escaped chars (using \ char) from a user

I'm writing a plugin for a serial port program and need to support sending non ASCII chars. I would like to allow the user to express non-ASCII chars in a simple hex escape format: \01 \0D etc

So a sample string would be input as:
\01A01TEST\02
which would be interpreted as a string of these hex chars:
01 41 30 31 54 45 53 54 02

I'm new to TCL so any ideas on better ways to get this done is appreciated.

--Johnny
.

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