STX,ETX & ACK using SAP MII 14

Hello MII Experts,

I have a requirement to send a message string from MII to legacy system with STX as a beginning character, ETX as a ending character & ACK in case of Acknoledgement (STX, ETX & ACK are Control characters) . STX can be represent as ^B or HEX 02 and ETX can be represent as ^C or HEX 03. ACK can be represent as ^F or HEX 06. I am unable to create STX,ETX & ACK in MII. Need your help..

Sample String - ^BHelloWorld123^C or ^FHelloWorld123^C

Thanks,

Swanand