VMS Help SET, HOST, /LAT, Qualifiers, /SPEED  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SPEED=(output-rate,input-rate)

    Sets the baud rate at which the terminal receives and transmits
    data. If the input and output rates are the same, specify the
    qualifier as /SPEED=rate.

    Not all terminals support different input and output baud rates.
    For specific information on baud rates for your terminal, consult
    the manual for that terminal.

    The default transmission rates are installation dependent.

    The valid values for input and output baud rates are as follows:

    300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600

    If you select an invalid or unsupported speed, the terminal line
    speed will remain set at its previous value.

                                   NOTE

       To change the speed on the terminal server port, the REMOTE
       MODIFICATION characteristic must be enabled on that terminal
       server port.

       When initiating a connection, SET HOST/LAT may attempt
       to set terminal server port characteristics, such as the
       speed and the default speed for a LAT device. If the device
       connected to the terminal server port has a fixed speed
       (such as a dial-out modem) and you do not want the host
       to try to change this, disable the REMOTE MODIFICATION
       characteristic on that port using the following command:

       Local> DEFINE PORT x REMOTE MODIFICATION DISABLE
       Local> LOGOUT PORT x

       Use the following command for terminal servers that support
       the CHANGE command:

       Local> CHANGE PORT x REMOTE MODIFICATION DISABLE