The supported extended message by this scanner is

SYNCHRONOUS DATA TRANSFER only.

The first message sent by the initiator after the SELECTION phase shall be an IDENTIFY, ABORT, or BUS DEVICE RESET message. If a target receives any other message it shall go to BUS FREE phase.(see unexpected disconnect ANSI SCSI-2 6.1.1)

If the first message is an IDENTIFY message, then it may be immediately followed by other messages, such as the first of a pair of SYNCHRONOUS DATA TRANSFER REQUEST messages. The IDENTIFY message establishes a logical connection between the initiator and the specified logical unit or target routine within the target known as an I_T_L nexus to be re-established. Only one logical unit shall be identified for any connection; if a target receives a second shall go to BUS FREE phase (see unexpected disconnect ANSI SCSI-2 6.1.1). The treatment of other logical unit addressing errors is described in ANSI SCSI-2 7.5.

Whenever an I_T_L nexus is established by an initiator that is allowing disconnection, the Initiator shall ensure that the current pointers are equal to the saved pointers for that particular logical unit or target routine. An implied restore pointers operation shall occur as a result of a reconnection.

ABORT (Init Targ)

The ABORT message is sent from the initiator to the target to clear any I/O process for the I_T_x nexus. The target shall go to the BUS FREE phase following successful receipt of this message. The pending data, status, and I/O processes for any other nexus shall not be cleared.

Previously established conditions, including MODE SELECT parameters, reservations, and extended contingent allegiance shall not be changed by the ABORT message.

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M3099GX/GH OEM Manual