Dressler 13150 400 V, User Manual

Page: 73 / 176

HPG 13150 400 V (A) Communication Interfaces 4-35
HPG™ 13150 400 V RF Power Generator
Prerelease version
You can control the HPG generator through a network using a Modbus/TCP
connection.
Figure 4-21 illustrates the connector.
Figure 4-21. Ethernet connector
The following sections describe some of the attributes of HPG generator
Modbus/TCP communication. For general information about the Modbus/TCP
protocol, visit the Modbus Users Web Site at: www.modbus.org. For more
information on connecting to the unit through the Ethernet port, see
“Connecting and Setting Ethernet (Modbus/TCP) Communication” on
page 5-6
and “Connecting to an Ethernet-Enabled Unit With a Web Browser”
on page 5-41 .
The HPG generator does not directly implement Modbus/TCP. Instead, a
program running on the interface board accepts Modbus/TCP packets from
the
Host , sends appropriate AE Bus commands to the HPG generator using
the internal RS-232 interface, and forms an appropriate reply packet.
The system supports up to 6 Modbus/TCP connections to port 502.
Registers are defined in an absolute-zero-based format.
Note: When using third-party tools, make sure to select zero-based format.
UNDERSTANDING MODBUS/TCP COMMANDS AND
REGISTER TYPES
The HPG generator uses the class 2 definition of Modbus/TCP. FC23 is used
to map the HPG generator’s AE Bus commands to the Modbus/TCP packet.
You can use FC23 to run all common HPG generator commands. For more
information and specific register information, see page
4-36 .
The HPG generator may reply to Modbus/TCP commands with the following
exception codes:
• 01 (illegal function)
• 02 (illegal register reference)
• 03 (illegal data value)