Helios FU Comfort Sinus Manuel De Montage Et D'utilisation page 158

Installation and Operating Specification FU Comfort Sinus
Information
•
You must ensure correct connection; i.e. "A (D+)" must also be connected on the following devices
to "A (D+)". 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).
•
Except the data link "A (D+)", "B (D-)" and "GND" (for automatic addressing additional "ID1" -
"ID2"see following chapter) no further cable cores of the data line may be used.
•
Pay attention to sufficient distance from powerlines and motor wires (min. 20 cm).
•
A maximum of 64 participants can be directly connected to one another, and another 64 participants
via a repeater.
Example for MODBUS connection
26.02.2007
v_modbus_verbindung.vsd
Recommended wire types
1. CAT5 / CAT7 cables
2. J-Y (St) 2x2x0.6 (telephone cable)
3. AWG22 (2x2 twisted pair)
Max allowed wire length 1000 m (CAT5/7 500 m).
When using telephone cable with four cable cores, we recommend the following allocation:
•
A (D+) = red
•
B (D-) = black
•
ID1 - ID2 = yellow (for automatic addressing)
•
GND = white
Default interface parameter
•
Baudrate = 19200
•
Bits = 8
•
Parity = Even
•
Stop bits = 1
•
Handshake = none
Shielding
The use of shielded cables is normally not needed but offers high protection against electromagnetic
interferences, especially high frequencies. However, the effectiveness of the shield depends on care-
ful installation of the line.
If shielded cables are used, the shield should be placed at "PE" on at least one side (preferably on the
master connection). The occurrence of compensating currents may have to be considered if the shield
is contacted on both sides.
L-BAL-E304-GB 2004
MODBUS
Part.-No.
19/139
The data line must be conducted 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.
Electrical installation