When you are trying to comunicate via serial communications to the 6K, either with the comserver or with another com port program(MSComm control in VB, for example), you must put a time delay between the write and read functions. Higher level languages such as VB execute their functions at a faster rate than the 6K. Placing a time delay allows the 6K time to receive, execute and echo the response to the command. For example:
temp = sixK.write("trev:")
text1.text = sixK.read()
This delay allows the 6K to execute the trev command before the VB tries to read the response.