SDM-SIO4 - Campbell Scientific

COMPONENT
SDM-SIO4
Serial Input/Output Module
4-Channel Serial
Input/Output Module
Connects to
Campbell Scientific dataloggers
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Overview
SDMS4-3D
Description
(data storage)
The SDM-SIO4 has four configurable 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 efficient.
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 different 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 filter out
critical data from a sensor and only pass back the data the
datalogger requires.
Benefits and features
Four independent RS232 ports
Dedicated processor - operates in parallel with datalogger
Send and receive complex data strings
Comprehensive data formatting and filtering
Compatible with CR800/850, CR1000, CR3000, CR5000 and
CR9000X dataloggers
Programming
For simple applications the SDM-SIO4 can be configured
and controlled from the datalogger alone, using the
datalogger program instruction.
More complicated applications require configuration
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 Scientific). This allows you to
set up mechanisms to control the transmission of long,
formatted output data and filtering of numerical values
out of received data. This is done by storing the detailed
formatting and filtering configurations 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 off unwanted characters and reduce
the data to either binary or floating 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.
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.
Typical applications
Control and monitoring of intelligent serial sensors
Display boards for visitor centres or control rooms
NB: Not compatible with CR500, CR510 and CR200-series dataloggers
More info: +44(0) 1509 828 888
www.campbellsci.eu/sdm_sio4
Shepshed, LE12 9GX UK | +(0)1509 828888 | sales@campbellsci.co.uk | wwwcampbellsci.eu
UK | AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | SOUTH AFRICA | SPAIN | USA
SDM-SIO4 Specifications
Valid for a temperature range of -25°C to +50°C, unless otherwise specified.
Serial Ports
Number of Ports: 4 (Independently configurable for different serial data formats)
Baud Rate: 25 to 115,200 bps
Port Output: 0-5V logic; ±5V for RS232 (switchable)
Port Configuration: 9-way ‘D’ connector
Data Flow Control: By datalogger, or SDM-SI04 if required, using hardware or software protocols
Buffers (each port): Receive (Rx), 981 bytes long + 16-byte hardware buffer; Transmit (Tx), 981 bytes long + 16-byte hardware buffer; Processed data storage, 891 bytes long. (Suitable for storing 222 4-byte Campbell Scientific floating point values). Buffers are ‘fill and stop’ type. Once filled with data any additional data received will be lost. There is an additional buffer, which is used only when the datalogger outputs floating point data via the SDM-SIO4. This buffer is 241 bytes — long enough for 60 floating point values.
Port 1 can be used for advanced configuration of the SDM-SIO4. A null modem cable (available from Campbell Scientific as an option) is required for connection to a PC.
SDM Port
The SDM port is used by the datalogger to communicate with the SDM-SIO4 and other SDM peripherals. The speed at which data is transferred
is under the control of the datalogger and this can vary with other activities in the datalogger and also the length of the SDM cables.
Multiple SDM-SIO4s can be connected to the datalogger in parallel. The only difference would be the SDM address of each SDM-SIO4.
Terminal Type:
Typical Transfer Rate:
6-screw type, with the following connections:
C1 (data line)
C2 (clock line)
C3 (synchronous device enable)
I/O (special purpose interrupt line)
+12V
G
One byte per millisecond
Power Requirements
Because of the minimal current drain (0.7 mA quiescent, 40 mA with all four ports active), the SDM-SIO4 is typically powered directly from
the datalogger. A supplementary power supply may be required for some applications, especially where more than one SDM is operated by
a single datalogger.
Power Supply: Unregulated 12V supply, 9 – 18V DC
Current Consumption:
typically 40 mA with all ports active; 0.7mA quiescent (quiescent state entered if there is no SDM or port activity for approx. 30ms)
Operating Environmental Range
Temperature:
-25°C to +50°C.
Humidity:
0 - 95% RH (non-condensing)
Physical
Case: Anodised aluminium
Dimensions:
184 x 88 x 34 mm
Mounting: Mounting tabs are provided at each end of the case for vertical/horizontal mounting.
Max. Total Cable Length: 6 m (3 m for high speed communication)
Other Key Features
Internal lithium battery which retains configuration information (estimated life 10 years)
Built-in system watchdog which will reset the processor in the event of a crash caused by transients, etc.
Multi-tasking operating system allowing concurrent transmission and receipt of data on all ports. This allows the receipt and processing of
data from all four serial ports concurrently at 9600 baud.
A built-in status LED to give an indication of system function on power-up.
SET UP
STATUS
G +12 I/OC1 C2 C3
SDM-SIO4
4-Channel Serial
PORT 4
I/O Module
MADE
PORT 3
Front view showing the four separately
configurable I/O ports
IN ENGLAND
PORT 2
PORT 1
SDM-SIO4
(data storage)
Shepshed, LE12 9GX UK | +(0)1509 828888 | sales@campbellsci.co.uk | wwwcampbellsci.eu
UK | AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | SOUTH AFRICA | SPAIN | USA
© 2012
Campbell Scientific
October 22, 2014