IDL 101
MASTER FUNCTION
HB_IDL101_E_V222.doc
53
Gantner Instruments Test & Measurement GmbH
7. MASTER FUNCTION
7.1. Master Function
Both interfaces and the master function of the
Datalogger IDL 101
allows a configuration of a complex measurement
system. In such a system with activated master function the data logger as master reads out data of the other bus
users (slaves).
This technique is used to enlarge the number of inputs and outputs of the
Datalogger IDL 101
if the 6 analog inputs
and 16 digital inputs/outputs of the data logger are not sufficient. Modules of the series “
ISM 100
“ can be connected to
the RS-485 interface as slaves. The data logger reads out the measured values of the sensor modules automatically via
the bus and stores them in its memory. In this way complex systems to record up to 92 channels can be realized easily.
The advantage of this master function are the sufficient number of inputs and outputs and that the sensors can be
located in a area over some kilometers. The data storage is central in the master data logger in the internal buffered
RAM.
This data can be read out directly via the RS-232 interface or via wire based, radio or GSM modems. Also the
configuration of the
Datalogger IDL 101
is done via this interface.
To arrange such a measurement system with the
Datalogger IDL 101, ISM
and
e.bloxx
modules follow the described
steps and pay attention to it:
□
Already configured
ISM 100
sensor modules with the same bus settings, (i.e. all sensor modules must have the
same protocol (ASCII/Profibus or Modbus), baud rate and parity set), will be connected to the RS-485 interface of
the Datalogger. Take care that all sensor modules have different addresses!
□
The
Datalogger IDL 101
is connected to the host via the RS-232 interface. The
Configuration Software ICP 100
is
installed on the host PC.
□
With the factory settings the master function is disabled. To activate the master function e.g. with an arithmetic
channel a “read” or “write” function has to be defined. As soon as the master function is activated it is no longer
possible to read out or configure the Datalogger via the RS-485 interface as it is reserved to read out the slave
modules.
□
At least the addresses of the slaves and channel numbers, which have to be stored, must be entered in a list.
□
Up to 60 external channels can be read and stored by the
Datalogger IDL 101
. The number of measurement values
which can be stored depends on the memory size of the internal data memory.
□
The transmission rate to the external modules can be set between 2400 and 38400 baud. This rate can be different
to the transmission rate between the
Datalogger IDL 101
and the host.
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