COMPONENT
SDM-SIO4
Serial Input/Output Module
Overview
Description
The SDM-SIO4 has four congurable serial RS232 ports
which allow it to be connected to intelligent serial sensors,
display boards, printers, satellite links and many other
applications where the data is transferred in a serial
fashion. This device is designed to send data to and receive
data from the sensors, and process it in parallel with the
datalogger’s own program sequence, thus making the
complete datalogging system faster and more ecient.
Connections
Communication with the SDM-SI04 is via datalogger
control ports 1, 2 and 3. Up to 16 SDM modules (in any
combination) can be added to a single datalogger, making
it possible to provide up to 64 RS232 ports.
Data Handling
The SDM-SIO4 can handle incoming and outgoing
data in many dierent ways. It can either send data in
the same format as sent from the datalogger or it can
be programmed to send pre-stored data strings to the
sensor. Combinations of data sent from the datalogger
and pre-stored strings can be sent, allowing complex
formatted data to be sent. For input, the SDM-SIO4 can
transfer data in the same form as received from a sensor
to the datalogger, or it can be programmed to lter out
critical data from a sensor and only pass back the data the
datalogger requires.
For simple applications the SDM-SIO4 can be congured
and controlled from the datalogger alone, using the
datalogger program instruction.
More complicated applications require conguration
of the SDM-SIO4 using the ‘command line’ function on
a PC running a terminal emulator. A null modem cable
will be required for connection to the PC (available as
an option from Campbell Scientic). This allows you to
set up mechanisms to control the transmission of long,
formatted output data and ltering of numerical values
out of received data. This is done by storing the detailed
formatting and ltering congurations in the SDM-SIO4.
Thus, when the datalogger needs to send out long or
complicated data strings it only needs to send a short
command to the SDM-SIO4 to tell it to do this, i.e. it does
not have to pass the whole string via the SDM interface.
Likewise, by telling the SDM-SIO4 how to process received
data, it can strip o unwanted characters and reduce
the data to either binary or oating point numbers. This
minimises the time it takes for the datalogger to get the
data and so allows the datalogger to load the data values
into memory with minimal processing.
www.campbellsci.eu/sdm_sio4
More info: +44(0) 1509 828 888
4-Channel Serial
Input/Output Module
Connects to
Campbell Scientic dataloggers
UK | AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | SOUTH AFRICA | SPAIN | USA
Benets and features
Four independent RS232 ports
Dedicated processor - operates in parallel with datalogger
Send and receive complex data strings
Comprehensive data formatting and ltering
Compatible with CR800/850, CR1000, CR3000, CR5000 and
CR9000X dataloggers
NB: Not compatible with CR500, CR510 and CR200-series dataloggers
Control and monitoring of intelligent serial sensors
Display boards for visitor centres or control rooms
Typical applications
Programming
SET UP
STATUS
SDM-SIO4
4-Channel Serial I/O Module
MADE IN ENCLAND
SDMS4-3D
(data storage)
NB: This product is not recommended for new projects. It can
still be supplied for expansion of existing networks already using
these units or replacing failed units. Support for this device in new
dataloggers is not guaranteed in the long term.
(74 páginas)
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