Part 4: Operations; Serial Interface Configuration-Communication Protocol; Command Structure; Command Formats - Omega iServer DPi8 User Manual

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)
^AE
P (Put)
W (Write)
G (Get)
R (Read)
U
V
X
D
E
Z

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:
Point-to-point mode
* ccc<data><cr>
Multi-point mode
* nnccc [<data>]<cr>
MEANING
Special read, Communication parameters
Write HEX data into RAM
Write HEX data into EEPROM.
Read HEX data from RAM
Read HEX data from EEPROM
Read status byte
Read measurement data string in decimal format
Read measurement data values in decimal format
Disable
Enable
Reset
classes:
Point-to-point mode
* ccc <cr>
Multi-point mode
* nnccc <cr>
12
& "Z" Command classes:
Point-to-point mode
* ccc <cr>
Multi-point mode
* nnccc <cr>