WAGO I/O System 750
List of Figures 37
750-940 EnOcean RS-485 Gateway; 868 MHz
Manual
Version 1.3.0, valid from FW/HW Version 01/01
4.2.6
Process Output Data
The Modbus master sends an ESP3 report by writing in the EnOcean Gateway
process output register. Next, the Modbus master receives a response with a
message indicating whether the ESP3 report was received.
If there is an error, the corresponding error code as specified in the Modbus is
read out. The error code can accept values from 0x01 to 0x04. When the value
0x04 is set, the Modbus master is informed that the ESP3 could not be written
into the register because either the sending buffer is full or the ESP3 report is
invalid.
4.2.7
Basic Device Data
There are two way to poll the basic device information:
•
With function code 43 (0x2B), the data is sent in ASCII format as a
response.
•
The information is sent as an ASCII string to registers 56 to 95, which are
dedicated for this purpose. Here, register 55 specifies the actual length of
the string in bytes.
The Modbus master reads out register 55, calculates the data string length
it contains and then reads the basic device information from the
corresponding registers.
