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Microprocessor-Based
Multidrop Instruments for Industrial
Data Acquisition and Control

Standard Features: Analog signal conditioning with multipole low-pass active filtering and regulated, remotely sensed excitation Selectable analog filtering Selectable digital filtering Internal custom linearization 5-digit LCD digital indication Dual limit monitoring with front-panel annunciation and isolated logic control outputs Programmable limit hysteresis Scalable "live" analog output Real-time analog positive peak capture (most models) Digital track and hold Automatic tare offset Formattable serial-ASCII data transmissions RS232 (single-node) data communications with optional IEEE-488 or RS422 conversion RS485 (network) data communications Automatic print interval Instrument setup via front panel or external computer/terminal Configuration security via code-number entry Logic-input control of peak capture, tare offset, hard-copy printout, and unlatching of latched conditions Free StartPAC 100 software available for network management, data display and communications, and other utilities

YOU CAN ORDER 3500 SERIES INSTRUMENTS DIRECTLY FROM THIS WEB SITE.   Click the ORDER ONLINE button to go to the 3500 Series MODELS listing.

3500 Series General Description 3500 Input Types Superior Signal Conditioning Limit Monitoring and Local Real-Time Control Peak Capture and Track/Hold Operation Front-Panel or Remote Setup Single- or Multinode Data Communications   General Specifications  Go to 3500 Series MODELS and ACCESSORIES   APPLICATIONS   COMMAND DIRECTORY   SPECIAL MODIFICATIONS
	View / download the complete 3500 Series section of the Daytronic Instruments Catalog   View / download the complete 3500 Series Instruction Manual

The third and forth digits of a 3500 Series instrument's model number identify the "type" of signal source, as follows:

	"30" = AC LVDT
	"40" = Frequency (AC or pulse input signal)
	"60" = Miscellaneous DC Analog Voltage
	"70" = DC-Excited Strain Gage Transducer
	"78" = AC-Excited Strain Gage Transducer

Each single-channel 3500 Series instrument provides 16-bit, 1-kHz A/D conversion with transparent auto-calibration every 2 seconds.  To ensure noise-free indication and control action, both analog and digital filtering levels are user-selectable from the front panel.

A number of calibration techniques are available, including "absolute," "actual" or "simulated" two-point ("deadweight"), and "calculated."  The best calibration method to employ will depend both on the conditioner model and on known characteristics of the measured test or process.

Nonlinear inputs can be calibrated using internal 15-segment linearization.  Linearization points can be either numerically entered or "forced" to desired output values.

For batch weighing and other applications that require auto-taring, and appropriate offset value can be automatically applied at the touch of a button, by external command, or on receipt of a logic-level input at the rear of the unit (see, for example, Batch Weighing with Motor Control).

Both "live" data and user-entered setup values are vividly displayed by the front-panel reflective LCD.  All models are supplied with a large assortment of engineering unit legends on a convenient 4" x 5.5" dry transfer sheet.  Typical measurement accuracies vary with different models (see individual instrument specifications).

Measured data is continuously evaluated with respect to three user-defined limit zones (HI, OK, and LOW).  Real-time limit status is indicated by front-panel LCD annunciators, while a corresponding TTL/CMOS-level control output is issued from the rear Logic I/O Connector.

Each logic output is isolated to ± 1500 V and provides up to 50 mA for driving external devices directly.  You can set the HIGH LIMIT and LOW LIMIT outputs to be either latching or nonlatching, as required by your application.  For any nonlatching limit, you can define a hysteresis window to prevent toggling of the limit from signal noise.

A user-scalable ±5 VDC ANALOG OUTPUT is generated for connection to a strip-chart recorder or other device.  This analog output can also be used as feedback for a PID control loop.  See Specifications for full output characteristics.

The Model 3540 Frequency Input Conditioner employs a digital technique for capturing the most positive measurement reading since the instrument was last reset.  For all other 3500 Series models, peak capture is a purely analog function, the last-captured positive maximum being digitally held until a higher input-signal value is perceived or the instrument is reset.

Any 3500 instrument can be placed in TRACK/HOLD mode (instead of peak capture).  When this is the case, the instrument can be commanded to freeze the present value of the analog input signal, without decay, until a command is received to return to normal "TRACK" operation.  See, for example, the Model 3570 Brake Testing application.

Both peak capture and track/hold modes may be controlled by front-panel buttons, by a rear-panel logic input, or by mnemonic commands received at the instrument's RS232/RS485 Interface Port.

All 3500 instruments can be completely set up and operated either through the front-panel keypad or through simple English mnemonic commands received from an external computer or terminal through the RS232/RS485 Interface Port.

Entry of a unique configuration security code, if desired, prevents an operator from modifying the existing setup via the fron panel.  All setup values are automatically stored in nonvolatile memory, for complete poweroff protection.

In addition to its network setup and configuration "cloning" functions, Daytronic's StartPAC 100 software includes a simple terminal emulation program that lets you issue any standard 3500 Series commands from a remote PC.

Each 3500 instrument's 9-pin RS232/RS485 Interface Port permits data interchanges of up to 153.6K baud.  Current measurement data is transmitted from this port in response to an interrogation from an external computer or terminal, or in response to a PRINT command from a front-panel push button or logic-level input.

The user can format data transmissions by specifying a terminating character string, optional header and tailer strings, optional node-number "echo," and optional limit-status indication.

The Interface Port can be easily configured for either single-node, full-handshake RS232 communications or multinode RS485 communications.

Single-Node (RS232) Communications

In single-node operation, the 3500 instrument connects to a supervisory computer that can control the unit directly via simple ASCII mnemonic commands—or to a printer, recorder, "dumb" terminal, or other RS232 device.

When the instrument is set for RS232 communications, you can specify the time interval that is to occur between successive automatic hard-copy transmissions (up to 68 minutes).

Single-node IEEE-488 or RS422 communications are made possible by an optional interface adaptor (Model CIF488A or Model 10E422, respectively).

Multinode (RS485 Network) Communications

In multinode operation, the 3500 instrument can be a member of a high-speed multidrop network of up to 99 3500 Series and 4000 Series data-collection instruments, mixed as desired (to be networked, 4000 Series instruments must be equipped with the "N" (Network) Option).  For an example of a plant-wide 3500 network, see Smoke Stack Flow Monitoring.

Network interchanges take place over simple twisted-pair RS485 "daisy-chain" linkage, at standard baud rates from 300 through 153.6K.

In a multinode network like the one shown above, the host computer can "open" any selected node by issuing an OPEN (OPN) command to the entire network.  Only one node can be "open" at any one time.  The currently "open" node (only) will respond to all subsequent commands issued to the network—including all requests for "local" measured and/or calculated data.

Simple polling routines let your computer optimize network transfer speed as it interrogates a sequence of nodes and receives appropriate response inputs.  For computers with limited input buffering, the Daytronic Model PC-HSICA High-Speed Interface Card is available.

For easy configuration and monitoring of a multinode network, Daytronic's StartPAC 100 software is available free of charge.

3500 Series General Specifications  [Back ]
Physical / Environmental
Case	DIN package outline of extruded metal, with splash-resistant front panel
Mounting	Clamp slides allow mounting in user's precut panel (for cutout dimensions, see diagram below—maximum panel thickness allowed is 0.24" (6 mm))
I/O Connections	Secure rear connections via screw terminals (except for the Model 3578 AC Strain Gage Conditioner, which uses a special Conditioner Connector requiring direct solder-terminal attachment of cable leads—see diagrams, below
Instrument Dimensions (Bench-Mount)
(click on image to enlarge)
ESD Immunity	Meets Class 3 Industrial Standard (8 kV) everywhere on the case and on every line
Operating Temperature Range	0° C to +50° C (+32° F to +122° F)
Storage Temperature Range	-40° C to +80° C (-40° F to +176° F)
Operating Humidity Range	10 to 95% maximum, noncondensing
Instrument Weight	Approximately 3.25 lb (1.47 kg)
Power & Display
Voltage	90-265 VAC (eliminates the need to convert between 110-V and 220-V levels)
Frequency	50-400 Hz
Consumption	10 W maximum
Display	5-digit LCD reflective, non-light-emitting
Signal Conditioning (ALL MODELS) —see also the statement on Daytronic accuracy specifications
A/D Conversion	16-bit; approximately 1-kHz conversion rate; transparent autocalibration every 2 seconds
Analog Filtering	See individual model specifications
Digital Filtering	Quieting factor selectable from front panel or by computer-port command
Internal 15-Segment Linearization	Programmable from front-panel or by computer-port command
Positive Peak Capture	See individual model specifications
Logic Functions
Limit Logic	Three limit zones (LOW/OK/HIGH) with front-panel annunciation and corresponding TTL-level logic outputs (see Logic I/O); outputs for LOW and HIGH limit conditions can be latching or nonlatching; each limit setpoint has a user-settable hysteresis window to prevent toggling of the limit output from signal noise
Logic I/O	TTL- and CMOS-compatible; isolated (±1500 V) from power and communication ports.  Negative-true outputs for limit monitoring (isolated +5 V provides up to 50 mA for driving external devices directly); negative-true inputs for control of PRINT, TARE, PEAK, and UNLATCH functions (see diagram, below).
Logic Inputs* Logic Level Volts (Operating) Volts (Without Instrument Damage) 0 0.9 V (max.) -0.5 V (min.) 1 2.5 V (min.) 5.5 V (max.)  Logic Outputs Logic Level Voltage at Current 0 0.45 V (max.) @ 10 mA (sink) 1 2.6 V (min.) @ 0.5 mA (source) * The minimum time allowed between activation and reactivation of any logic input is 100 ms.
Analog Output
Full-Scale Range	±5 V nominal; ±8 V maximum Range is scalable in 0.1% increments between 74.5% and 125.5% of nominal input.  Except for the Model 3540, may be sourced by conditioned input (A) after the FIXED ANALOG FILTER (see individual models); (B) after PEAK CAPTURE; or (C) after the SELECTABLE ANALOG FILTER (see individual models)
Allowable Loading	5 mA, maximum
Offset Range Adjustment	±25.5% in 0.1% increments
Offset Accuracy	0.1% maximum
Span Accuracy	0.2% maximum
Offset and Span Drift	±50 ppm/°C; ±20 ppm/month
Frequency Characteristics and Step-Response Settling Times	These characteristics vary with the model number and selected analog output source point (A, B, or C); see individual model specifications
Configuration	Single-ended, return to System Common
Communications
Serial	9-pin RS232/RS485 port (interface mode selectable by instrument "node number" setting); standard baud rates from 300 through 153.6K for both RS232 and RS485; RS485 configuration allows operation as an individual data-collection "node" within a computer-controlled network*
Parallel	IEEE-488 interface available as option, using the Daytronic Model 10CIF488A Interface Adaptor
* NOTE: RS485 conversion is required at the computer's I/O port (see the Models 5D485 and 5E25); the RS232 output may be converted to RS422 standards by means of an optional Model 10E422.