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SDM-SIO1A Serial Input/Output Module
3.
Initial Inspection
4.
Overview
2
CAUTION: The power ground connection to the datalogger should be
•
made with large gauge wire, (for example, 16 AWG or 1.5 mm
provide a low impedance path to ground allowing full protection from
static and electrical transients.
CAUTION: The SDM-SIO1A is considered to be a component of a
•
measurement system that is installed in an enclosure and wired in
accordance with this manual. Due to space considerations, full details of
the maximum ratings of the connections are not given on the device.
Instead the user should study this manual and in particular Section 5.2.2,
SDM-SIO1A Voltage Specifications
voltages that are applicable to any terminal before starting an installation.
•
The SDM-SIO1A ships with the following:
o
Two screws and plastic inserts to allow the module to be installed on
the backplate of standard Campbell Scientific enclosures
o
ResourceDVD (1), which includes the following:
This manual
−
DevConfig 2.12 software or later (only needed if upgrading the
−
operating system of the SDM-SIO1A)
•
Upon receipt of the SDM-SIO1A, inspect the packaging and contents for
damage. File damage claims with the shipping company. Contact
Campbell Scientific to facilitate repair or replacement.
The SDM-SIO1A expands the number of serial ports on a Campbell Scientific
datalogger. It can be used as a means of collecting data from digital sensors
and/or to send commands to sensors and devices. It can also be used to send
data to remote display devices.
The SDM-SIO1A will accept serial data and store it in its buffer allowing
remote equipment to transmit large amounts of data without needing to stop
other processes in the datalogger whilst the data is received.
The SDM-SIO1A connects to the datalogger via three digital lines using a
proprietary protocol called SDM. It connects to the remote serial device using a
standard serial interface that can be set to RS-232, RS-485, or RS-422 signal
levels.
Up to 15 SDM-SIO1As can be connected to a single datalogger via the SDM
port, allowing the user to connect 15 different items of equipment to their
datalogger with ease, in addition to any connections made to the datalogger
built-in serial ports.
The SDM-SIO1A can also be used in "talk-through" mode to allow a user to
talk, via a terminal program, to a sensor connected to the SDM-SIO1A for test
and diagnostic purposes. Please refer to the datalogger manual for further
details.
2
) to
, to determine the maximum
(p. 5)
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