Proxima ASA 7911 - Manual (Page 81)

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the External Computer creates a command packet, it should place
a unique number (from 0 to 127) into the seqno field of the
packet. When the Serial Adapter later generates a response to that
packet, it will place this same value in the seqno field of the
response. In this way, the External Computer can match re-
sponses with commands.
MCP Command Messages to the Serial Adapter
This section describes each of the messages which may be sent to
the Serial Adapter via its RS-232 serial line by an External Com-
puter. The first byte of each command specifies the command that
the Serial Adapter is to perform. It is followed by data bytes
which are actually arguments to the command. The data format is
8 data bits, no parity, 1 stop bit.
Transmit Data Packet
Purpose: To send a data message over the radio to the specified
Serial Adapter.
Response Expected from Serial Adapter: “Status Indication of
Transmitted Packet”
Message Format:
BYTE command (ASCII ‘T’, 54H)
BYTE seqno
BYTE len H ; Length of data field below
BYTE len L
BYTE destaddr H
BYTE destaddr 3
BYTE destaddr 2
BYTE destaddr L
BYTES data