Proxima ASA 7911 - Manual (Page 77)

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tions where developing special software to interact with the Serial
Adapter is undesirable.
For some applications, the Pass-through mode of operation is not
ideal. For example, because the Pass-through Serial Adapter
takes all information arriving at its serial line as data to be sent out
over the radio network, it is not possible to change the Serial
Adapter’s configuration on the fly by sending it commands over
the serial line.
For the External Computer to be able to send both data and
commands to the Serial Adapter, both the Serial Adapter and the
External Computer must agree on some rules of order for distin-
guishing data packets from command packets. Proxim has de-
fined a simple serial protocol which performs this function. This
protocol is incorporated into the packetized mode of the firmware.
The remainder of this document is devoted to an explanation of
the Packetized mode serial protocol.
The figure below illustrates the protocol architecture of the
Packetized mode.
MCP
(Modem Command
Protocol)
PPX-1
(Proxim Packet Exchange)
RS-232