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NAME
    CloseDevice -- close the serial port

SYNOPSIS
    CloseDevice(deviceNode)
                 A1
FUNCTION
    This is an exec call that terminates communication with the
    serial device.  Upon closing, the device's input buffer is freed.

    Note that all IORequests MUST be complete before closing.
     If any are pending, your program must abortio() then waitio()
    to complete them.

INPUTS
    deviceNode - pointer to the device node, set by Open

SEE ALSO
    serial.device/opendevice