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© 2012
Campbell Scientic
October 22, 2014
SDM-SIO4 Specifications
Valid for a temperature range of -25°C to +50°C, unless otherwise specified.
Serial Ports
Number of Ports: 4 (Independently congurable for dierent serial data formats)
Baud Rate: 25 to 115,200 bps
Port Output: 0-5V logic; ±5V for RS232 (switchable)
Port Conguration: 9-way ‘D’ connector
Data Flow Control: By datalogger, or SDM-SI04 if required, using hardware or software protocols
Buers (each port): Receive (Rx), 981 bytes long + 16-byte hardware buer; Transmit (Tx), 981 bytes long + 16-byte hardware
buer; Processed data storage, 891 bytes long. (Suitable for storing 222 4-byte Campbell Scientic oating
point values). Buers are ‘ll and stop’ type. Once lled with data any additional data received will be lost. There
is an additional buer, which is used only when the datalogger outputs oating point data via the SDM-SIO4.
This buer is 241 bytes — long enough for 60 oating point values.
Port 1 can be used for advanced conguration of the SDM-SIO4. A null modem cable (available from Campbell
Scientic 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 dierence would be the SDM address of each SDM-SIO4.
Terminal Type
: 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
Typical Transfer Rate: 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 conguration 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
PORT 4 PORT 3 PORT 2 PORT 1
SDM-SIO4
4-Channel Serial I/O Module
MADE IN ENGLAND
SDM-SIO4
(data storage)
Front view showing the four separately
congurable I/O ports
(74 pages)
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