I am using RS232 to communicate with programmable power supplies, and to a modified data bus that uses the same protocol. The file I am using has the .btm extension and opens in TCC. echo 1l. > COM6: copy com6: con: This works except the COPY command expects CTRL-Z (ASCII 26) at the end of the string. The device I am connected to can not be configured to provide the CTRL-Z. Ultimately I want to parse the return string... so I'll need to capture it into a variable. Is this all just a pipe dream with TCC?