WAGO I/O System 750
List of Figures 33
750-940 EnOcean RS-485 Gateway; 868 MHz
Manual
Version 1.3.0, valid from FW/HW Version 01/01
4.2
Use as EnOcean Gateway in Modbus Mode
In Modbus mode, the EnOcean Gateway serves as the Modbus slave and
establishes a connection between the protocol types EnOcean ESP3 and
Modbus.
Communication with a Modbus master is accomplished by Modbus telegrams via
the serial interface; the EnOcean reports are embedded in these telegrams as a
payload. In the process, Modbus-specific commands are written into and read out
from special registers.
The registers are register entries with a length of 16-bits. They are numbered
according to the Modbus specification. Thus, the registers are addressed as
0 to 95; see Table “Register Layout.”
The EnOcean Gateway supports the “SMART ACK” functionality.
Communication consists of the following data and tools:
•
Modbus address
•
Device reset
•
Resetting ESP3 report buffer
•
Process input data
•
Process output data
•
Basic device information
The following Modbus function codes are also supported:
•
0x03: Read Holding Registers
•
0x10: Write Multiple Registers
•
0x2B: Read Device Identity (basic device information)
