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CM-1115(20)-RT-AR User Manual

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VIII. DxP Protocol

(continued)

DxP Packet

The packet is broken up into 2 parts: the Header and the Payload.

Header

The header is used to carry general information, such as is shown in the C

programming structure below:

typedef struct {

eCmnd command;

char[21] uName;

char[21] password;

uChar desc;

uint16 seq;

} THeader

Variable

Description

command

Enumerated type that tells the DxP server what class of command is being sent.

See the Commands subsection for a full list of command classes.

uName

Reserved for future use. It will contain the user name of a user on the ipIO that is

being accessed.

password

Reserved for future use. It will contain the password of the user above.

desc

Command descriptor that describes the individual command within a command

class. By extension it lets the server know what the payload is. There is a

different set of descriptors for each command class; see the Descriptors

subsection for a full list of descriptors by command class.

param

Reserved for future use. Optional parameter that may be passed to the server in

addition to the descriptor.

seq

The packet’s sequence number. Used as part of the security scheme.

Payload

The payload is determined by a combination of the command class and the descriptor.

The payloads are described with the descriptor; see the Descriptors subsection for

details.

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Axess Ready CM-1115-RT-AR Installation Guide Page 24