WAGO I/O System 750
List of Figures 31
750-940 EnOcean RS-485 Gateway; 868 MHz
Manual
Version 1.3.0, valid from FW/HW Version 01/01
4.1
Use as EnOcean Gateway in ESP3 Mode
In the standard setting, the EnOcean Gateway serves as a gateway for
connecting EnOcean devices to the higher-order control level.
The module uses the ESP3 protocol for communication and supports the
EnOcean profile EEP 2.1. The native ESP3 telegrams are exchanged between
the EnOcean Gateway and a serial remote station (e.g., a WAGO 750-652 I/O
Module) in a 1:1 connection. Communication is through an RS-485 interface.
After receiving a EnOcean telegram, the module checks whether its structure and
length are valid. The maximum length of an EnOcean telegram is fifty bytes.
Overly long or otherwise defective telegrams are rejected.
The EnOcean Gateway supports the “SMART ACK” functionality.
4.1.1
Telegram Synchronization with FEEEED Functionality
The EnOcean Gateway serial interface is based on an RS-485 bus that operates
in half-duplex mode.
The permanently activated FEEEED functionality, contained in the function block
“FB_ENOCEANCOM” can be used to avoid potential collisions between
telegrams that overlap in time. The FEEEED functionality synchronizes the
EnOcean Gateway with the serial remote station. In the process, the remote
station initiates synchronization and sets the EnOcean Gateway into FEEEED
mode by sending a telegram to the module once.
Then the module stays in FEEEED until it receives either another FEEEED
telegram or an ESP3 telegram from the remote station, or the timeout period of
350 ms expires.
In FEEEED mode, first the EnOcean Gateway buffers all the telegrams received
from the EnOcean radio module and only forwards the data to the remote station
if it receives an additional FEEEED telegram or a native ESP3 telegram from the
station. After all the buffered telegrams have been sent, the module buffers all
telegrams once again and waits for a new FEEEED or ESP3 telegram from the
remote station.
Once the set timeout period expires, the module deactivates FEEEED mode and
sends all telegrams buffered up to that point to the remote station. Next, all ESP3
telegrams received by the EnOcean radio module are immediately sent to the
remote station.
