Information
After switching on the line voltage, an initialisation time of a maximum 7.5 seconds is required for the
device's electronics to be operational. Subsequently, a reliable status message will be possible. If no
malfunction is detected, the relay will be energised after the initialisation time.
Since both line voltage fluctuations and ambient conditions affect the initialisation time, a different
delay might occur in individual cases.
5.14 Communication
5.14.1 Networking via MODBUS-RTU
The device comes equipped with a RS-485 interface for networking via MODBUS. Conntection at: “A
(D+)”, “B (D-)” and “GND”.
The address must be set in the “IO Setup”menu.
Information
A maximum of 64 participants can be directly connected to one another, and another 64 participants
via a repeater.
5.14.2 RS-485 - network design and interface parameter
Please ensure the correct connection; i.e. "A (D+)" must always be connected to "A (D+)" of the next
devices. The same applies to "B (D-)" .
In addition, a "GND" connection must be established, as dissimilar potential (over 10 V!) will lead to
the destruction of the RS-485 interface (e.g. lightning).
general example for MODBUS device connection
The data line must be connected from one device to the next. No other type of wiring is allowed!
Always use only two wires of one lead (twisted pair) for the connection.
Example for MODBUS connection
Recommended wire types
1. CAT5 / CAT7 cables
2. J-Y (St) 2x2x0.6 (telephone cable)
3. AWG22 (2x2 twisted pair)
When using telephone cable with four cable cores, we recommend the following allocation:
“A (D+)” = red, “B (D-)” = black, “GND” = white
Assembly instructions ECblue Electrical installation
L-BAL-F055D-GB 2021/51 Index 006 Part.-No.
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