Proxima ASA 7911 - Manual (Page 95)

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Bit 4 is set if CD is asserted on the sending side.
Bit 5 is set if the sending host has sent a BREAK; this bit should
be set to 0.
Bit 6: Reserved and always set to 0.
Bit 7: Reserved and always set to 0.
Messages received from the Serial Adapter will contain the four-
byte header before the actual data. Note that the header size and
format is the same whether the Serial Adapter is in Pass-through
or Packetized mode.
6. The port numbers, IP Address, Destination Address, and Send
Mode need to be set up on the Serial Adapter to match what your
program on the wired workstation is using.
The Remote Port Number must match the port number on which
your workstation program is listening.
The IP Address and Local Port Number must match the port
number and address to which your workstation program is send-
ing.
If the Serial Adapter is in Pass-through mode, the destination
address must be set to the IP address of the wired workstation. If
the Serial Adapter is in Packetized mode, your Packetized mode
program must set the Destination Address of the data packets it
sends to the IP address of the wired workstation.
The Send mode of the Serial Adapter must match the protocol that
your workstation program is using to receive messages (TCP or
UDP).