Gantner IDL 101, Инструкция по эксплуатации

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IDL 101
STRUCTURE OF THE BUS TOPOLOGY
28
HB_IDL101_E_V222.doc
Gantner Instruments Test & Measurement GmbH
R
R
R
VP (6)
A (8)
B (3)
DGND (5)
bus cable
u
t
d
= 390 2%, at least watt
R
u
R
t
R
d
Ω
= 150 2%, at least watt
Ω
= 390 2%, at least watt Ω
±
±
± 14
14
14
VP = +5V :
Figure 4.5 Bus Termination
Notice: The terminal designations A and B are exchanged, compared with the PROFIBUS-definitions, for the
Datalogger IDL 101 and all devices of the ISM series “100“. This means that in multi-vendor-systems the bus lines A
and B must be exchanged when they are connected to a
Datalogger IDL 101 and a device of the ISM-line.
Notice : The figures in parentheses in figure 4.5 indicate the pin number for the connection via the 9-channel D-sub-
miniature plug.
The bus termination can be carried out via external resistors and a separate power supply, independent of the module,
according to figure 4.6. In this case we recommend the use of the indicated resistors for the bus termination.
Or the bus termination is connected with the bus users at the beginning and at the end of a bus line. Most of the RS-
485 connections for controls, computers, repeaters, interface converters, etc. offer this possibility.
This possibility is also given with the
Datalogger IDL 101. Via the bus termination plug IBT 100 which is available as
accessory and installed at the right port on the front side of the device, the bus termination at the data logger can be
additionally connected. Two jumpers are integrated in the bus termination plug. These provide the connection between
the bus and the bus termination in the data logger.
Notice : Instead of the bus termination module
IBT 100 separate jumpers can also be used for the bus termination. In
this case, please make absolutely sure that the jumper clips are installed as indicated, and that the bus leads or the bus
termination are not short-circuited by mistake!