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UMG 96-PA
27
8.
Interface
The RS485 interface in this device is a 3-pole
plug contact that communicates via the Mod-
bus RTU protocol.
Cable types:
• Recommendation: Unitronic Li2YCY(TP)
2x2x0.22 (Lapp cable)
Connection options for the connectors:
• 0.2 - 1.5 mm
2
(see Section "Technical Data")
Fig. Screening procedure at cabinet entry.
Cable
Strain relief
Screen braid
of the cable
Earthing clamp
Low-noise earth
e.g.
Connection
to the
UMG 604
as gateway
(master)
e.g.
Connection
of further
slave devices
B
A
RS485 bus
A
B
A
B
Data GND
Fig. RS485 interface, 3-pole plug contact
B
A
RS485 bus
A
B
Data GND
120 Ω
Fig. RS485 interface, 3-pole plug contact with termina-
tion resistor (item no. 52.00.008)
8. 1
Screening
Use a drilled and shielded cable for the con-
nections via the interface, and observe the
following points for the shielding:
• Earth the screens of all cables that lead to
the cabinet where they enter the cabinet.
• Connect the screen over a larger area and
in a manner that will conduct well, to a
low-noise earth.
• Do
NOT
connect the screen to terminal C
(GND)
• Gather the cables mechanically above the
earthing clamp in order to avoid damage
due to cable movement.
• Use suitable cable glands to feed the ca-
bles into the cabinet - for example armored
conduit couplings.
C
ATTENTION!
CAT cables are not suitable for bus
wiring. Use the cable types recom-
mended for this purpose.
Summary of Contents for UMG 96-PA
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