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PART 4
OPERATIONS
An industrial device with serial interfaces (PLC, CNC controllers, PC, Data Display
Devices, etc.) can be connected to the serial port of the Web Server.
4.1 SERIAL INTERFACE CONFIGURATION - Communication Protocol
A data communication protocol defines the rules and structure of messages used by all
devices on a network for data exchange. A typical transaction will consist of a request to
send from the MASTER followed by the response from one or more SLAVE devices.
Either a single (point-to-point) or multi-drop network (multi-point) is possible.
4.2 Command Structure
There are different command types associated with communication between the
Ethernet Server and your device shown in Table 4.1, which shows the Command Prefix
Letters (Command Classes)
Table 4.1 Command Prefix Letters
COMMAND PREFIX
(COMMAND CLASS) MEANING
^AE Special read, Communication parameters
P (Put) Write HEX data into RAM
W (Write) Write HEX data into EEPROM.
G (Get) Read HEX data from RAM
R (Read) Read HEX data from EEPROM
U Read status byte
V Read measurement data string in decimal format
X Read measurement data values in decimal format
D Disable
E Enable
Z Reset
4.3 Command Formats
Table 4.2 shows the command formats for the Ethernet Server.
Table 4.2 Command Formats
For "P" and "W" Command For "G" and "R" Command For "X", "V", "U", "D", "E",
classes: classes: & "Z" Command classes:
Point-to-point mode Point-to-point mode Point-to-point mode
* ccc<data><cr> * ccc <cr> * ccc <cr>
Multi-point mode Multi-point mode Multi-point mode
* nnccc [<data>]<cr> * nnccc <cr> * nnccc <cr>
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