Operation mode “Monitor”:
A Master (e.g. available computer system) interrogates the connected slaves without
influencing the system.
The measured data of the slaves is analysed. For this the setting of the slave address
and data format for each channel is required (see “Set up - analogue inputs - channel
xx - PROFIBUS DP”). The transmitter specification/settings must be noted.
Should a slave deliver more than one measurement (multi parameter transmitter) each
measurement requires its own input channel.
Operation mode “Slave”:
The Visual Data Manager is fed into the PROFIBUS-DP field bus system by the
PROFIBUS-DP coupler as an active slave operating using cyclic data transmission.
Using this function bi-directional communication between the central control system
and the de-centralised peripheral units is possible in the field level. Sata is transmitted
serial with a maximum data transmission rate of 12MBit/s. The Visual Data Manager is
integrated into the field bus system using the delivered GSD file. In actual fact the
RS232 interface is used. Simultaneously the stored data can be transmitted to a PC
using the RS485 interface.
Hint:
This option cannot be combined with the PROFIBUS additional PCB (monitor
operation mode). For more detailed information please read the additional
documentation ZBA117R09en.
Hints:
•
In order to be correctly displayed the real physical measured values (e.g. in C,
bar...) must be transmitted. Scaling on the unit is not possible.
•
Please make sure that connections not needed in the plug are not connected.
•
PROFIBUS PA can be used via a PA/DP bus coupler (“Segment coupler”).
•
PROFIBUS measurement points can be combined with each other and with
conventionally connected analogue signals by using the mathematics module.
7.4 Setting up a modem
link
Basically every normal commercial modem using AT commands can be used in order
to transmit data between the VDM RS 232 interface and the delivered PC software.
Modem at the unit
The modem that is to be used at the VDM end of the link must first be initialised using
the PC software (Extras - Set-up modem for connection to unit).
In order to do this the modem is first connected to the PC using the modem original
connection cable (is normally delivered with every modem)
The initialisation must be done using the identical data format (Baurate, Data bits,
Parity) as in the VDM unit.
Four functions must be activated in the modem:
After a successful initialisation the modem is connected to the VDM unit using a
special (null-)modem cable.
Only three cores are needed (TxD, RxD, GND).
Hint:
The original modem cable cannot be used for this purpose as the modem and
VDM unit have the same PIN connections on the interface socket.
Modem at the PC
The modem that is connected to the PC does not have to be initialised. The
connection is also made using the original modem cable (normally delivered with the
modem).
The first connection is constructed as follows:
7. Serial interfaces/Modem
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