MODEMSTATUS

MODEMSTATUS

Modem Control data structure.

Type

BYTE  fbModemOn
BYTE  fbModemOff

C Declaration Method

typedef struct

Fields

fbModemOn  Modem Control Signals ON Mask.
           The physical device driver sets the modem control signals as defined
           in this field.  Bit 0 is DTR; bit 1 is RTS.  If any other bits are
           set/reset by the masks, then a general failure error results. The
           OFF mask contains a mask (with all bits equal to 0) to turn the
           modem control signal off. The ON mask contains a mask (with all bits
           equal to 1) to turn the modem control signal on.  If the Parameter
           Packet indicates both turn off and turn on on the same bit, the bit
           will be turned on. For example: 
           ┌─────────┬─────────┬───────────────┐
           │Mask ON  │Mask OFF │Description    │
           ├─────────┼─────────┼───────────────┤
           │   01h   │   FFh   │Set DTR        │
           ├─────────┼─────────┼───────────────┤
           │   00h   │   FEh   │Clear DTR      │
           ├─────────┼─────────┼───────────────┤
           │   02h   │   FFh   │Set RTS        │
           ├─────────┼─────────┼───────────────┤
           │   00h   │   FDh   │Clear RTS      │
           ├─────────┼─────────┼───────────────┤
           │   03h   │   FFh   │Set DTR and RTS│
           ├─────────┼─────────┼───────────────┤
           │   00h   │   FCh   │Clear DTR and  │
           │         │         │RTS            │
           └─────────┴─────────┴───────────────┘
           If DTR Control mode input handshaking, RTS Control mode input
           handshaking or toggling on transmit is set, then this request cannot
           try to change the state of the modem control signals, that are being
           used for input handshaking or toggling on transmit. If the request
           tries to modify a modem control signal that is being used for input
           handshaking or toggling on transmit, a general failure error
           results. 
 
fbModemOff Modem Control Signals OFF Mask.
           See Modem Control Signals ON Mask above.

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