Modbus Tcp/Ip Airzone - Airzone Modbus Bedienungsanleitung

MODBUS TCP/IP AIRZONE

Note: Available for Airzone systems, Webserver and Aidoo Pro.
The format of the commands for read/write operations with Modbus TCP is as follows:
Transaction Protocol
EN
ID identifier
2 bytes 2 bytes
◊
Transaction ID. Enables synchronization of messages between the server and the client.
◊
Protocol identifier. Always 0 value in Modbus TCP.
◊
Length field. Number of bytes in the frame.
◊
System address. Defines the system to be accessed. Addresses are from 1 to 247, with
address 0 reserved for transmission to all devices (Broadcast).
◊
Operation code. Indicates the function that the command will perform.
◊
Zone address. For zone commands, this field defines the zone to which the operation is
carried out. For system commands this byte is always 0.
◊
Register address. Indicates the address of the register to be accessed. In commands on
multiple registers, defines the Start Register from which to operate consecutively.
◊
Data. Formed by 2 bytes (single operations) or set of 2 bytes (multiple operations) that
contain the command information.
14
System
Length field
address
2 bytes 1 byte
Operation Zone
code address
1 byte 1 byte
Register
Data
address
1 byte 1...2·N bytes