SA-20-AR User Manual
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20
VII. DxP PROTOCOL
Overview
The DxP Protocol is a packet-based protocol designed to be extensible. This protocol is
transmitted over TCP on a user-defined port. The factory default DxP port is 9100.
The protocol uses a Hello handshake to establish unique sequence numbers to allow for
advanced security when AES encryption is used. With AES enabled, all messages must be
encrypted with the AES Passphrase set in the device.
After the Hello, a Command and Response sequence follows. Any number of
Command → Response sequences are permitted after Hello.
Hello Handshake
The client sends a Hello message in the form of a text string ‘hello-000’. The DxP enabled
device will respond with a packet containing the unsigned 16-bit sequence number. This
sequence number is incremented by the client and server with each correct packet sent.
Example:
Client
Server
hello-000
→
←
1234
(seq 1234)
Command
(seq 1235)
→
←
Response
Command
(seq 1237)
→
←
Response
