You can use CSFE to test your terminal, but only if it is one of the terminals supported by CICS.
You cannot use CSFE to test the following:
You start the transaction by entering CSFE on the command line of the screen, as follows:
CSFE
Press the ENTER key. You get the following display:
DFHFE3304 Enter PRINT for character set, END to
terminate. All other data will be echoed.
Any other input is returned to your terminal (that is, it is echoed), unless it is of the form of one of the other CSFE requests.