West Control Solutions DataVU 7 - Manual (Page 159)

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22 Configuration - Interface
Data format The data format that is to be used for operating the interface.
Min.
response time The minimum response time is the minimum time that the recorder will take
before it sends a response to a data request.
The minimum response time is required by the RS 485 interface in the master,
in order to switch over the interface driver from transmit to receive. This
parameter is not required for the RS 232 interface.
22.2.2 Modbus master
Overview
The parameters found under Modbus master can only be set up if the Modbus
master was selected as the protocol in the RS232/RS485 interface settings.
General The timeout and polling cycle are set here. The timeout defines that time after
which the master will declare that an initiated request has an error. The polling
cycle defines the interval between requests for reading data from a slave
device.
Addr. ext.
analog value A maximum of 24 external analog inputs can be read into the paperless
recorder. The following parameters must be configured for each analog
variable.
8 - 1 - no parity 8 data bits, 1 stop bit, no parity
8 - 1 - odd parity 8 data bits, 1 stop bit, odd parity
8 - 1 - even parity 8 data bits, 1 stop bit, even parity
Device address The address of the slave device from which data
are to be fetched.
Modbus address Address within the instrument.
The entry is made in decimal format.
v See the instrument documentation for the slave
device.