Surgex SX-20NE-RT-AR User Manual download pdf (Page 23)

SX-20NE-RT-AR User Manual

Page 22

VIII. 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

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Surgex SX-20NE-RT-AR User Manual Page 23