Impulse SCM9B-1000_2000 Series - Manual

SCM9B
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Isolated Intelligent Signal Conditioning Products
SCM9B
SCM9B-1000/2000 Series
Sensor-to-Computer Modules
Description
The SCM9B-1000/2000 Sensor-to-Computer Modules are a family of complete
solutions designed for data acquisition systems based on personal computers
and other processor-based equipment with standard serial I/O ports. The
modules convert analog input signals to engineering units and transmit in ASCII
format to any host with standard RS-485 or RS-232C ports. These modules can
measure temperature, pressure, voltage, current and various types of
digital signals. The modules provide direct connection to a wide variety of
sensors and perform all signal conditioning, scaling, linearization and conver-
sion to engineering units. Each module also provides digital I/O lines for
controlling devices through solid state relays or TTL signals. These digital I/O
lines along with built-in limit setting capability provide alarm and control outputs
(see Figure 1).
The modules contain no pots or switches to be set. Features such as address,
baud rate, parity, alarms, echo, etc. are selectable using simple commands
over the communications port—without requiring access to the module. The
selections are stored in nonvolatile EEPROM which maintains data even after
power is removed.
The 2000 series is an enhanced version of the 1000 series of sensor interfaces.
The 2000 series allows the user to scale the output data in any desired
engineering units. The 2000 also provides the ability to program nonlinear
transfer functions. This feature may be used to linearize nonstandard sensors
or to provide outputs in engineering units which are nonlinear functions
of the input.
Figure 1: SCM9B-1000/2000 Block Diagram
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Features
• Complete Sensor to RS-485 or RS-232C Interface
• ASCII Format Command/Response Protocol
• 500Vrms Analog Input Isolation
• 15-Bit Measurement Resolution
• Continuous Self-Calibration; No Adjustments of Any Kind
• Programmable Digital Filter
• Digital Limit Setting and Alarm Capability
• Digital Inputs and Outputs Connect to Solid State Relays
• Events Counter to 10 Million
• Requires +10V to +30VDC Unregulated Supply
• Transient Suppression on RS-485
Communications Lines
• Screw Terminal Plug Connectors Supplied
• CE Compliant
Programmable Features (2000 Series)
(Provides intelligent features not found in the 1000 series.)
• ASCII Output Scaled to Desired Engineering Units
• User Programmable Nonlinear Transfer Function
• Straight-Line Segment Approximation: up to 24 Segments