RMG ERZ2000-NG, Руководство по эксплуатации

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4 Communication and bus systems
Manual ERZ 2000-NG · EN07 · 2019, May 13th
144
Setting in
IB09 / IB12 / IB21
operating mode Interface Task
DSfG control sta-
tion IB09
COM 3 ERZ2000-NG is the DSfG control station
DSFG IB12
COM 4 ERZ2000-NG is the "normal" participant on the bus
ERZ2000-NG is the computing and/or registration instance
Modem IB21
COM 5 ERZ2000-NG establishes a DSfG station access as a DFÜ unit
An external modem should be connected to COM 5
The DSFG bus is connected via COM 4 for a "normal" user.
DSfG pin assignment:
1
+U (+5V DC) activatable via DIP Switch
2 GND activatable via DIP Switch
3 RDA/TDA
4 free
5 GND activatable via DIP Switch
6 free
7 GND activatable via DIP Switch
8 TDB/RDB
9 free
GND and +5V are the voltage supply of the RS 485 part, not the computer. The
housing of the trapezoidal plug must be connected electrically to the housing of the
device.
DSfG bus termination
The start and end of the DSfG bus must be terminated electrically. For this purpose,
there are two 8-pole DIP switches (
Figure 103
) on the DSfG interface board which
are provided to switch the bus terminating resistors and current supply to the plug.
The left switch on the board (see
Figure 103: DIL switches of COM 3 and COM 4
) is
for the computing and registration instance, the right switch for the control station (if
available). In
Figure 103
, the switches are "ON" in the "rear" status (towards the
printed circuit diagram) and "OFF" in the "front" status.
The interfaces are isolated galvanically and conform to DSfG specifications. In order
to fulfill the specifications for the bus supply and the idle level, the resistances and
voltage can be activated with DIL Switches. The terminating resistor is positioned
according to the specifications at the start or end of the main cable and, therefore,
positioned externally on the cable or preferably on the star distributor.