/FLOW_CONTROL=control-option

    Indicates the type of flow control used over the physical
    link. You can specify one of the following keywords with this
    qualifier:

    Keyword    Description

    HARDWARE   Uses RTS/CTS flow control. If using this control, the
               transmit Asynch Control Character Map (ACCM) can be
               0x0, 0x0, 0x0, 0x60000000. Only valid for lines set to
               /MODEM or /COMMSYNCH.
    XON_XOFF   Uses band flow control. If using this control, the
    (de-       optimal transmit ACCM is 0xA0000, 0x0, 0x0, 0x60000000.
    fault)     Only valid for asynchronous lines.