DayTronic 3500 Series Instruction Manual

3500

INSTRUMENT SERIES

SB.3

INSTRUCTION MANUAL

Copyright © 1997, Daytronic Corporation. All rights reserved.

No part of this document may be reprinted, reproduced, or used in any form or by
any electronic, mechanical, or other means, including photocopying and recording,
or in any information storage and retrieval system, without permission in writing from
Daytronic Corporation. All specifications are subject to change without notice.

3500 Series Instruction Manual, v. SB.3

Pub. No. 3500M.3, Issued 1/97

3500

INSTRUMENT

SERIES

Part No. 91668

INSTRUCTION MANUAL

Daytronic Corporation

2211 Arbor Blvd. • Dayton, OH 45439-1521 • Tel [phone] • Fax [phone]

www.daytronic.com

C

ONTENTS

1INTRODUCTION

a. Using This Manual ........................................................................................................ 1.1

b. General Instrument Descriptions

1. Introduction ....................................................................................................................... 1.1

2. The Model 3510 Thermocouple Conditioner ....................................................... 1.2

3. The Model 3530 LVDT Conditioner .......................................................................... 1.2

4. The Model 3540 Frequency Input Conditioner .................................................... 1.2

5. The Model 3560 Voltage Conditioner ..................................................................... 1.3

6. The Model 3570 DC Strain Gage Conditioner ...................................................... 1.3

7. The Model 3578 AC Strain Gage Conditioner ...................................................... 1.3

c. Physical Layout .............................................................................................................. 1.4

d. Panel Mounting ...............................................................................................................1.6

e. Summary of Setup Button Functions ............................................................ 1.7

f. Summary of Logic I/O Functions ..................................................................... 1.8

g. Mnemonic Commands ............................................................................................. 1.9

2SETUP: CONNECTIONS AND POWER

a. Transducer Connections

1. The “Standard” Analog Input Connector ............................................................... 2.1

2. Connecting a Thermocouple to the Model 3510 ................................................ 2.1

3. Connecting an LVDT or Variable Reluctance Transducer

to the Model 3530 .......................................................................................................... 2.2

4. Connecting a Frequency Source to the Model 3540 ........................................ 2.4

5. Connecting a Voltage Source to the Model 3560 .............................................. 2.6

6. Connecting a DC Strain Gage Transducer to the Model 3570 ...................... 2.7

7. Connecting an AC Strain Gage Transducer to the Model 3578 .................... 2.8

b. RS-232 (“Single-Node”) Connections .......................................................... 2.10

c. RS-485 (“Multinode Network”) Connections ......................................... 2.12

d. Analog Output Connections .............................................................................. 2.15

e. Logic Input/Output Connections ................................................................... 2.16

f. Powerup ............................................................................................................................ 2.18

3SETUP: INSTRUMENT CONFIGURATION

a. Configuring Through the Front Panel

1. Entering and Exiting SETUP MODE .......................................................................... 3.1

2. Security Code .................................................................................................................. 3.2

3. RS-232 Communications Parameters: COM Key .............................................. 3.3

4. RS-485 Communications Parameters: COM Key .............................................. 3.7

5. Input Range: RANGE Key ........................................................................................... 3.8

a. Setting the Model 3510’s TC Type and Scale ................................................ 3.8

b. Setting the Model 3530’s LVDT Input Range .................................................. 3.9

c. Setting the Model 3540’s Frequency Input Range and Sensitivity ...... 3.10

d. Setting the Model 3560’s Voltage Input Range .......................................... 3.10

e. Setting the Model 3570’s DC Strain Gage Input Range

and Excitation .......................................................................................................... 3.11

f. Setting the Model 3578’s AC Strain Gage Input Range ........................... 3.11

iv

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ONTENTS

6. Filter: FILTER Key ......................................................................................................... 3.12

7. Analog Output: ANO Key .......................................................................................... 3.13

8. Limits: LIMIT Key .......................................................................................................... 3.14

9. Tare Offset: TARE Key ................................................................................................ 3.17

10. Print and Output Parameters: PRINT Key ........................................................... 3.18

b. Configuring Through the RS-232/485 Interface .................................. 3.20

1. Security Code ............................................................................................................... 3.20

2. Communications Parameters ................................................................................. 3.20

3. Thermocouple Type (Model 3510 ONLY) ........................................................... 3.21

4. Input Range or Scale .................................................................................................. 3.21

5. Excitation (Models 3570 and 3578 ONLY) .......................................................... 3.22

6. Sensitivity (Model 3540 ONLY) ............................................................................... 3.22

7. Filter .................................................................................................................................. 3.22

8. Analog Output .............................................................................................................. 3.23

9. Limits ................................................................................................................................ 3.23

10. Tare Offset ...................................................................................................................... 3.23

11. Print and Output Parameters ................................................................................... 3.23

4SETUP: INSTRUMENT CALIBRATION

a. Introduction: Calibration Techniques ............................................................ 4.1

1. Absolute Calibration ...................................................................................................... 4.1

2. “Actual” Two-Point (Deadweight) Calibration ....................................................... 4.2

3. “Simulated” Two-Point (Deadweight) Calibration ............................................... 4.2

4. Internal 15-Segment Linearization ........................................................................... 4.3

5. Calculated Calibration .................................................................................................. 4.3

6. Calculated Calibration Via Mnemonic Command .............................................. 4.3

b. Phase and Symmetry Adjustment of the

Model 3578 AC Strain Gage Conditioner .................................................... 4.4

c. Calibrating Through the Front Panel

1. Using the CAL Key ......................................................................................................... 4.8

2. “Actual” Two-Point (Deadweight) Calibration ....................................................... 4.8

3. “Simulated” (Shunt) Calibration for a Strain Gage Conditioner

(Model 3570 or 3578) ................................................................................................. 4.10

4. 15-Segment Linearization

a. Introduction .............................................................................................................. 4.12

b. By “TABLE” ............................................................................................................... 4.13

c. By “FORCE” .............................................................................................................. 4.15

5. “Calculated” Calibration

a. For the Models 3510, 3530, 3540, and 3560 ............................................... 4.16

b. For the Model 3570 (ONLY) ............................................................................... 4.17

d. Calibrating Through the RS-232/485 Interface .................................... 4.18

1. Setting the Active Calibration Method .................................................................. 4.18

2. “Two-Point” Calibration .............................................................................................. 4.19

3. 15-Segment Linearization ........................................................................................ 4.19

4. “Calculated” Calibration ............................................................................................ 4.20

v

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ONTENTS

5RUN-TIME OPERATION

a. RS-232/485 Communications

1. RS-232/485 Outputs: CHN and DMP Commands ............................................ 5.1

2. Data-Transmission Format ......................................................................................... 5.1

3. “Opening” a Node to Receive Commands from the Computer ................... 5.2

b. Peak Capture ................................................................................................................... 5.3

c. Tare and Reset ................................................................................................................ 5.5

d. Initiating Hard-Copy Printouts ............................................................................. 5.6

e. Track/Hold Function .................................................................................................. 5.7

Appendix A 3500 SERIES SPECIFICATIONS

1. General Specifications ........................................................................................... A.1

2. Individual Conditioner Specifications

a. Model 3510 Thermocouple Conditioner .............................................................. A.2

b. Model 3530 LVDT Conditioner ................................................................................. A.3

c. Model 3540 Frequency Input Conditioner ........................................................... A.4

d. Model 3560 Voltage Conditioner ............................................................................. A.5

e. Model 3570 DC Strain Gage Conditioner ............................................................. A.6

f. Model 3578 AC Strain Gage Conditioner ............................................................. A.7

Appendix B COMMAND AND RESPONSE SYNTAX

1. Introduction: RS-232 and RS-485 Modes .................................................... B.1

2. The OPEN (OPN) Command ................................................................................ B.1

3. Response to “Invalid” Commands ................................................................. B.1

4. Setup Commands ....................................................................................................... B.2

5. Interrogation Commands ...................................................................................... B.2

6. Imperative Commands ............................................................................................ B.2

7. Commands That Initiate Data Transmissions ....................................... B.3

8. Table of Mnemonic Commands ....................................................................... B.3

Appendix C TABLE OF ERROR NUMBERS ...................................... C.1

Appendix D NETWORKING GUIDELINES ........................................... D.1

Appendix E RUN-TIME BUTTON FUNCTIONS ............................. E.1

Appendix F STANDARD LOGIC CONFIGURATION ................... F.1

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ONTENTS

Illustrations

1(a) Typical “Run-Time” Display ........................................................................................... 1.4

1(b) Typical “Setup” Display .................................................................................................. 1.4

2(a) Rear Panel for the Model 3510 Thermocouple Conditioner

and the Model 3578 AC Strain Gage Conditioner ................................................ 1.5

2(b) Rear Panel for All Other 3500 Models ...................................................................... 1.6

3 Panel Mounting ................................................................................................................. 1.6

4 Use of NUMERIC BUTTONS in SETUP MODE ...................................................... 1.8

5(a) Standard Logic INputs and Outputs ......................................................................... 1.8

5(b) Shunt-Control Logic Inputs for the Model 3570 DC Strain Gage

Conditioner (ONLY) ..........................................................................................................1.9

6 Model 3510 Transducer Cabling ............................................................................... 2.2

7(a) Model 3530 Transducer Cabling: 5-Wire LVDT Cabling

(under 20 ft. in length) .................................................................................................... 2.3

7(b) Model 3530 Transducer Cabling: 7-Wire LVDT Cabling (20 ft. or longer) ... 2.3
7(c) Model 3530 Transducer Cabling: 3-Wire Variable Reluctance Cabling

(under 20 ft. in length) .................................................................................................... 2.3

7(d) Model 3530 Transducer Cabling: 5-Wire Variable Reluctance Cabling

(20 ft. or longer) ................................................................................................................ 2.4

8(a) Model 3540 Transducer Cabling: Differential (Floating) Frequency Input .. 2.5
8(b) Model 3540 Transducer Cabling: Single-Ended (Grounded) Frequency

Input ...................................................................................................................................... 2.5

8(c) Model 3540 Transducer Cabling: Input from a Zero-Velocity Sensor .......... 2.5

8(d) Model 3540 Transducer Cabling for Elimination of DC Offset ........................ 2.5

8(e) Model 3540 Transducer Cabling for Suppression of High-Frequency

Noise .................................................................................................................................... 2.5

9(a) Model 3560 Transducer Cabling: General Voltage Source ............................. 2.6

9(b) Model 3560 Transducer Cabling: External Potentiometer ............................... 2.6

9(c) Model 3560 Transducer Cabling: External DC-to-DC LVDT ............................. 2.6

10(a) Model 3570 Transducer Cabling: 4-Wire Cabling (under 20 ft. in length) ... 2.7

10(b) Model 3570 Transducer Cabling: 8-Wire Cabling (20 ft. or longer) .............. 2.7

11(a) Model 3578 Transducer Cabling: 4-Wire Cabling (under 20 ft. in length) ... 2.8

11(b) Model 3578 Transducer Cabling: 8-Wire Cabling (20 ft. or longer) .............. 2.8

11(c) Model 3578 Transducer Cabling: Installation of User’s External Shunt

Calibration Resistor ......................................................................................................... 2.9

11(d) Model 3578 Transducer Cabling: 8-Wire Cabling to LEBOW 1600

SERIES TRANSDUCER (ONLY) ................................................................................... 2.9

12 Suggested RS-232-C Interface Connections (to 25-Pin RS-232-C

Connector) ....................................................................................................................... 2.11

13 Suggested RS-232-C Interface Connections (to 9-Pin RS-232-C

Connector) ....................................................................................................................... 2.12

14(a) Connections for a Network of Three Instrument Nodes

(where the first is a 3500 Series Instrument) ...................................................... 2.13

14(b) RS-485 Cabling Between the Model 5E485 and the FIRST Network

Node (if it is a 3500 Series Instrument) ................................................................. 2.14

14(c) RS-485 Cabling Between Successive 3500 or 4000 Instrument Nodes .. 2.14
14(d) RS-485 Cabling Between a 3500 or 4000 Instrument Node and a

5000 Instrument Node ................................................................................................ 2.14

15 Analog Output Programming Pins .......................................................................... 2.15

16 Analog Output Connections (ALL Conditioners) ............................................... 2.16

(cont’d)

vii

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ONTENTS

17(a) Logic I/O Connections: Input from External Switch .......................................... 2.17

17(b) Logic I/O Connections: External TTL Logic ......................................................... 2.17

17(c) Logic I/O Connections: External Controller ......................................................... 2.17

17(d) Logic I/O Connections: Output to External Relay .............................................. 2.18

18 Limit Zones ...................................................................................................................... 3.15

19 High and Low Hysteresis Windows ........................................................................ 3.16

20 Symmetry and Phase Adjustment Controls for the Model 3578 ................... 4.4

21 Typical Linearization Curve with Seven Segments .......................................... 4.12

22 Capture and Hold of Successively Higher-Valued Maxima ............................ 5.4

23 Capture and Hold of Successively Lower-Valued Maxima Using

Peak Reset ......................................................................................................................... 5.4

24 Tare Offset Operation .................................................................................................... 5.5

25 3500 Physical Dimensions .......................................................................................... A.1

viii

INTRODUCTION

1.a USING THIS MANUAL

THIS MANUAL TREATS ALL SIX STANDARD MODELS BELONGING TO THE
DAYTRONIC 3500 INSTRUMENT SERIES. THESE MODELS ARE AS FOLLOWS:

• the Model 3510 Thermocouple Conditioner

• the Model 3530 AC LVDT Conditioner

• the Model 3540 Frequency Input Conditioner

• the Model 3560 Voltage Conditioner

• the Model 3570 DC Strain Gage Conditioner

• the Model 3578 AC Strain Gage Conditioner

EXCEPT WHERE OTHERWISE STATED, THE INFORMATION IN THIS MANUAL
APPLIES EQUALLY TO ALL SIX MODELS.

DESCRIPTIONS, PROCEDURES, AND OPERATIONS SPECIFIC TO A GIVEN
MODEL OR MODELS WILL BE CLEARLY IDENTIFIED AS SUCH.

1.b GENERAL INSTRUMENT DESCRIPTIONS

1

1.b.1 INTRODUCTION

Every 3500 Series instrument can be completely set up and operated either
through the front-panel keypad or via simple mnemonic commands received
from an external computer or terminal through its RS-232/485 Interface Port.
The instrument can transmit data from this port in response to an interrogation
from an external computer, or can send it to an RS-232 serial printer when the
PRINT button is pressed (assuming that it is set to RS-232 mode). When in RS­485 mode, a given 3500 instrument can represent one of up to 99 data-collection
"nodes" of a high-speed multidrop network.

Features common to all models include

• continuous dual-limit monitoring with front-panel annunciation, programmable
hysteresis windows, and TTL-level logic control outputs

• front-panel security code

• real-time positive peak capture or track/hold operation

• user-settable automatic tare offset

• internal 15-segment linearization for calibration of nonlinear inputs (except for

the Model 3510 Thermocouple Conditioner)

• selectable digital filtering

• selectable analog filtering (except for the Model 3510 Thermocouple Condi-

tioner)

• scalable analog output to drive strip-chart recorders or other devices (it may
also be used as feedback for a PID control loop)

• data-transmission formatting options, including "header" and "tailer" character
strings, node-number "echo," and limit-status indication

1.a USING THIS MANUAL 1.b GENERAL INSTRUMENT DESCRIPTIONS

1.1

1

INTRODUCTION

• logic-input control of peak capture, unlatching of latched limit conditions,
application of tare offset, and initiation of hard-copy printout

For complete specifications, see Appendix A.

1.b.2 THE MODEL 3510 THERMOCOUPLE CONDITIONER

This instrument accepts a temperature signal from a Type B, E, J, K, R, S, or T
Thermocouple. The sensor may be grounded or ungrounded. The conditioner

employs "absolute" calibration, which means that no calibration is required by the
user, once the proper "TC Type" is entered. During operation, appropriate refer­ence-junction compensation, digital linearization, and engineering-unit scaling are
automatically applied. Detection of "open" thermocouples is also provided.

The 3510’s special rear connector assembly contains a thermistor for precise
measurement of the reference-junction temperature. Therefore, no external cold
junction is required—although the user may supply his own Controlled Ambient
Temperature Zone for reference-junction purposes, if desired.

1.b.3 THE MODEL 3530 LVDT CONDITIONER

This instrument measures displacement, force, pressure, and other parameters
obtained with a 5- or 7-wire linear variable differential transformer (LVDT)
capable of 3280-Hz operation and having primary impedance of 80 Ω or greater.
It can also be used with a 3- or 5-wire variable reluctance transducer. The
"normal" input range can be 0-150, 0-300, or 0-600 mV/V, full scale. Input provi­sions also exist for "long-stroke" LVDT's (0-1, 0-2, or 0-4 V/V, full scale). Nominal 3
V-AC (rms) excitation is supplied.

1.b.4 THE MODEL 3540 FREQUENCY INPUT CONDITIONER

This instrument is used for measurement of flow, rpm, and other phenomena that
can be sensed by pulse transformer transducers with two-wire isolated windings
(tachometer pickups, turbine flowmeters, etc.), transistor or logic-circuit drivers,
"zero-velocity" (true digital output) sensors, and similar frequency-generating
transducers. It will accept any AC or unipolar pulse signal, floating or grounded,
irrespective of waveform. Input range is from 10% to 100% of 250, 500, 1000,
2000, 4000, 8000, 16000, or 32000 Hz.

The 3540’s analog-input threshold level is selectable to accommodate signals
from 100 mV to 100 V, thus guaranteeing reliable triggering when the input is at
the low end of the frequency range. Capacitive coupling of 0.1 µF is provided for
low-frequency inputs, to eliminate false triggering by signal noise or any DC offset
that exists for the frequency signal. For "zero-velocity" sensors, an excitation of
nominal ±5 V-DC ± 5% is supplied.

When you know the manufacturer-supplied full-scale rating of the frequency
source (or the highest frequency expected to be measured), the Model 3540’s
measurement channel can be quickly calibrated by issuing an "FRQ" command
through the RS-232/485 Interface Port.

1.2

1.b GENERAL INSTRUMENT DESCRIPTIONS

INTRODUCTION

1.b.5 THE MODEL 3560 VOLTAGE CONDITIONER

This is a general-purpose instrument for conditioning, displaying, and monitoring
the signal received from a DC-to-DC LVDT, potentiometer-type sensor, or other
external two-wire voltage source, either floating (differential) or grounded (sin­gle-ended). The input signal may also represent output from some other instru­ment system. Allowable full-scale voltage ranges are ±0.5, ±1.0, ±2.0, ±5.0, ±10.0,
and ±20.0 V-DC (up to ±100 V without damage). A ±12-V excitation is supplied for
sources that require it.

1.b.6 THE MODEL 3570 DC STRAIN GAGE CONDITIONER

This is a general-purpose instrument for input of pressure, force, torque, weight,
and other variables measured by conventional DC-excited strain gage trans-
ducers. It accepts a single input from any conventional 4-arm strain gage bridge,
nominal 120 ohms or higher, with a full-scale range of 0.75, 1.5, or 3.0 mV/V.
(User-supplied bridge-completion circuitry allows input from a 2-wire 1/4-bridge,
3-wire 1/4-bridge, or 1/2-bridge gage configuration.) The user may select a nomi­nal excitation level of 2, 5, or 10 V-DC. Remote sensing of bridge voltage yields
consistently stable ratiometric measurement, unaffected by possible power-sup­ply drift.

1

Simple two-point "zero and span" calibration is provided for the 3570’s input
channel. In addition, a 100-kΩ, 0.1% shunt resistor is supplied. You can use this
resistor—or one of your own—to apply an "equivalent input" for calibration purpos­es, when the transducer's full-scale mV/V sensitivity is accurately known. The cal­ibration shunt may be switched in and out for either a positive or negative
up-scale reading via simple commands issued to the RS-232/485 port or by
means of logic-level command signals through the rear Analog Input Connector.

A third calibration technique for the Model 3570 involves application of an "MVV"
command through the RS-232/485 Interface Port when both "mV/V" sensitivity
and corresponding full-scale rating of the transducer are known.

1.b.7 THE MODEL 3578 AC STRAIN GAGE CONDITIONER

This instrument is similar to the Model 3570 DC Strain Gage Conditioner, above,
but is of phase-sensitive carrier-amplifier design. Intended for applications involv-
ing transformer-coupling to the transducer bridge (as with rotary-transformer
torque sensors), it can also be used when high sensitivity is required or where
the electrical environment is especially noisy. Responding only to the modulated
carrier frequency, the 3578 rejects extraneous voltages that can cause errors in
DC systems, particularly when there is a need to "blow up" a portion of the trans­ducer range.

The Model 3578 accepts input from a 4-arm bridge of nominal 90 ohms or higher,
and a full-scale range of 0.75, 1.50, or 3.00 mV/V. Excitation is fixed at 3 V-AC
(rms) at 3280 Hz. There are user-settable phase and symmetry controls. This
conditioner also offers the same shunt calibration provisions as the 3570, except
that shunt calibration of the AC Strain Gage Conditioner cannot be controlled via
logic-input commands.

1.b GENERAL INSTRUMENT DESCRIPTIONS

1.3

1

INTRODUCTION

1.c PHYSICAL LAYOUT

Study the following diagrams to acquaint yourself with the most important front
and rear elements.

Fig. 1(a) shows a typical "RUN-TIME" display, with "live" data and limit-status
annunciation. Note the four front-panel buttons that are active (but not necessari­ly lit) during normal run-time operation. For a full description of run-time button
functions, see Appendix E.

Fig. 1(b) shows a typical SETUP display—specifically, the display that appears
after the security code has been entered and the unit is ready for any of the front­panel setup procedures given in Sections 3.a and 4.a.

Fig. 1(a) Typical “Run-Time” Display

RANGE

COM

CAL FILTER ANO

Active Run-Time Buttons

Active Setup

Buttons are lit

Setup message or

parameter value

"Live" Data

Display

"Live" Limit

Status Indicators

DEC

LIMIT

HI

OK
LO

ENTER

"DEC" button lights when

decimal-point location of

setup parameter can be

changed

Fig. 1(b) Typical “Setup” Display

1.4

1.c PHYSICAL LAYOUT

COM

SET UP

RANGE

CAL FILTER ANO

PEAK

TRACK

TARE

RESET

DEC

PRINT ENTER

LIMIT

HI

OK

LO

Limit Status Indicators

updated with every change

of the display

INTRODUCTION

Analog Output

Connector

(see Fig. 16)

Conditioner Connector

—attaches to Analog

Input Board

(see Fig. 6 or 11)

Logic I/O

Connector

(see Figs. 5, 17)

Fuse

(0.5-amp SLO-

BLO)

ON-OFF

Switch

AC Power

Connector

RS-232/485 Inter-

face Connector

(see Figs. 12 - 14)

Panel­Mount
Clamp
Screw

ON

OFF

+

+

Analog Output

Programming Pins*

(behind cover plate—see Fig. 15)

Symmetry and

Phase Controls*

(see Fig. 20)

* Not present on the Thermocouple Conditioner.

NOTE: Your instrument is supplied with a large assortment of standard engineer­ing unit legends on a 4" x 5 1/2" dry transfer sheet. The selected legend may be

rubbed directly onto the instrument's front-panel frame using the tip of a ball-point
pen or the blunt end of a stylus or other burnishing tool. DO NOT PRESS TOO
HARD. You can easily make up your own legends, since the sheet includes indi­vidual numerals, upper- and lower-case letters, ampersand ("&"), and Greek "∆,"
"ø," "µ," and "π."

The two rear panel types are shown below. The Model 3510 Thermocouple
Conditioner and the Model 3578 AC Strain Gage Conditioner have the rear
panel illustrated in Fig. 2(a). Each of these instruments employs a special CONDI­TIONER CONNECTOR that attaches directly to the rear edge of the unit's internal
Analog Input Board. In addition, the 3578 (only) has rear-panel Symmetry and
Phase Controls. All other models use a standard "clip-on" Analog Input Connec­tor like that shown in Fig. 2(b).

1

Fig. 2(a) Rear Panel for the Model 3510 Thermocouple
Conditioner and the Model 3578 AC Strain Gage Conditioner

1.c PHYSICAL LAYOUT

1.5

1

Analog Output

Connector

(see Fig. 16)

Analog Input

Connector**

(see Fig. 7, 8, 9,

or 10)

Logic I/O

Connector

(see Figs. 5, 17)

Fuse

(0.5-amp SLO-

BLO)

ON-OFF

Switch

AC Power

Connector

RS-232/485 Inter-

face Connector

(see Figs. 12 - 14)

Panel­Mount
Clamp
Screw

ON

OFF

+

+

Analog Output

Programming Pins*

(behind cover plate—see Fig. 15)

+

Not present on the Frequency Conditioner.
The number of connector terminals will vary with the conditioner type.

*

**

138 ± 1.0 mm

(5.43 ± 0.04 in)

68 ± 0.7 mm

(2.68 ± 0.03 in)

CLAMP SLIDE

CLAMP
SCREW

INTRODUCTION

Fig. 2(b) Rear Panel for All
Other 3500 Series Models

1.d PANEL MOUNTING

You can easily mount the instrument in your own precut panel. Cutout dimen­sions for a panel-mounted unit are standard DIN (see Fig. 3); panel thickness
should not exceed 6 mm (0.24 in).

Simply unscrew the two rear-panel CLAMP SCREWS and slide the CLAMP
SLIDES rearwards out of their grooves (THE FRONT BEZEL NEED NOT BE
REMOVED). Insert the unit through the panel cutout, from the front of the panel (if
the unit has rubber feet, these will have to be removed). Then reinstall the
CLAMP SLIDES, and tighten the CLAMP SCREWS until the instrument is securely
mounted.

Fig. 3 Panel Mounting

1.6

1.d PANEL MOUNTING

INTRODUCTION

1.e SUMMARY OF SETUP BUTTON FUNCTIONS

The use of the SETUP buttons is explained in detail in Sections 3.a and 4.a. The
following table summarizes the relevant functions:

Button Button Function (in SETUP MODE):

1

SET UP

TARE

RESET

PRINT

COM

RANGE

CAL

FILTER

ANO

Used to exit current setup procedure ("COM," "RANGE," "CAL,"
etc.) or to exit SETUP MODE.

Used to enter a value into the TARE REGISTER.

Used to enter desired PRINT AND OUTPUT PARAMETERS:
printing interval; node-number "echo" (ON/OFF); and limit-sta­tus indication (ON/OFF).

Used to enter desired COMMUNICATIONS PARAMETERS:
baud rate; number of data bits; number of stop bits; parity;
node number; INPUT TERMINATOR character; and OUTPUT
TERMINATOR character(s).

Used to enter desired INPUT RANGE or SCALE, plus other
parameters, where applicable (EXCITATION, SENSITIVITY, etc.)

Used for CALIBRATION of the analog input ("Two-Point," "Lin­earization," or "Calculated").

Used to set the ANALOG and DIGITAL FILTERS.

Used to scale the ANALOG OUTPUT.

DEC

LIMIT

ENTER

In addition to the above SETUP buttons, the instrument provides two NUMERIC
BUTTONS for each displayed character of the LCD display, plus a polarity "sign"
button. These buttons let you change the value of a displayed number or step
forwards or backwards through a displayed series of allowed setup values. In
general, to increase by "1" the numeric value of a displayed digit (up to a maxi­mum of "9"), press the TOP LCD SEGMENT of that digit, whether or not it is lit. To
decrease by "1" the numeric value of a displayed digit (down to a minimum of "0"),
press the BOTTOM LCD SEGMENT of that digit, whether or not it is lit. To change
the polarity of the displayed number, press the "minus-sign" segment at the
extreme left of the display (whether or not it is lit). The NUMERIC BUTTONS are
only active when the instrument is in SETUP MODE.

Used to change DECIMAL-POINT LOCATION for certain setup
values.

Used to enter LIMIT PARAMETERS: high limit; high hysteresis;
high latch (ON/OFF); low limit; low hysteresis; low latch
(ON/OFF).

Used to display the "existing value" of a setup parameter and
to finalize entry of a modified value.

1.e SUMMARY OF SETUP BUTTON FUNCTIONS

1.7

1

SET UP

TARE
RESET

PRINT ENTER

HI

OK

LO

COM

RAN

FILTER ANO

DEC

LIMIT

Press top segment to

increment digit (up to "9")

Press bottom segment to

decrement digit (down to "0")

Press "–"

segment to

change polarity

INTRODUCTION

Fig. 4 Use of
NUMERIC
BUTTONS in
SETUP MODE

1.f SUMMARY OF LOGIC I/O FUNCTIONS

The rear-panel LOGIC I/O CONNECTOR provides seven active logic input/output
bits in open-collector, negative-true form, where the "Logic 1" state is defined as
nominal 0 V-DC and "Logic 0" as nominal +5 V-DC. The standard logic I/O config­uration is shown in Fig. 5(a), below, with reference to the 10-terminal Logic I/O
Connector on the rear of the unit. For recommended logic interconnections, see
Section 2.e. Each I/O function is fully described in Appendix F.

+

*

PLEASE NOTE: THE MINIMUM TIME ALLOWED BETWEEN ACTIVATION AND
REACTIVATION OF ANY OF THE FOUR LOGIC CONTROL INPUTS IS 100 MIL­LISECONDS.

*

Ground connections to
be provided by user.
See also Fig. 17(a).

LOGIC LOW
TO ENABLE

Logic Inputs:

UNLATCH

PEAK

TARE

PRINT

Logic Outputs:

"LIVE" DATA IN
"OK" ZONE

"LIVE" DATA IN
"LESS THAN" ZONE

"LIVE" DATA IN
"GREATER THAN" ZONE

Fig. 5(a)
Standard Logic
Inputs and Outputs

1.8

1.f SUMMARY OF LOGIC I/O FUNCTIONS

INTRODUCTION

ANALOG INPUT CONNECTOR

–

SHLD

SHUNT CAL

CONTROL

COM

SIG

+

–

SIGCOM

PWR

*

Ground
connections to
be provided by
user. See also
Fig. 17(a).

*

LOGIC LOW
TO ENABLE

Logic Inputs:

+ CALIBRATE

– CALIBRATE

You can use the three logic control outputs to actuate solenoid valves, illuminate
panel displays, sound alarms, start and stop motors or pumps, initiate and control
safety shut-down sequences, and perform many other automation tasks that
require "intelligent" switching, even of substantial amounts of power.

In addition to the standard logic inputs and outputs provided by the LOGIC I/O
CONNECTOR, the Model 3570 DC Strain Gage Conditioner (ONLY) also
accepts two negative-true logic inputs at its rear-panel ANALOG INPUT CONNEC­TOR. These two inputs, shown in Fig. 5(b), let the operator directly control the
SHUNT CALIBRATION process, which is explained in detail in Section 4. Again,
see Appendix F for a full description of these logic functions.

Fig. 5(b)
Shunt-Control Logic
Inputs for the Model
3570 DC Strain Gage
Conditioner (ONLY)

1

1.g MNEMONIC COMMANDS

There are two ways to issue commands to a 3500 Series instrument. One way is
through the front-panel push buttons. These buttons allow you

• to enter all necessary SETUP COMMANDS, as explained in Sections 3.a and

4.a*; and also

• to enter RUN-TIME COMMANDS for control of positive peak capture, appli­cation of tare offset, and initiation and halting of hard-copy transmissions (see
Sections 5.b, 5.c, and 5.d).

The second way to issue commands to the instrument is via the RS-232/485
Computer/Network Communications Interface. When set to the RS-232 (SINGLE­NODE) mode, this interface will accept commands from a connected computer,
terminal, or other RS-232-C device. When the unit is used in the RS-485 (MULTIN­ODE) mode, commands will normally originate from an application program in the
network's supervisory computer.

In either RS-232 or RS-485 mode, commands to the instrument must be transmit­ted in a standard ASCII Command Syntax. This syntax uses simple three-letter

* As explained in Section 3.a.2, if a nonzero SECURITY CODE has been specified, the operator will

have to enter that code before any SETUP COMMANDS can be applied via the front-panel but­tons.

1.g MNEMONIC COMMANDS

1.9

1

INTRODUCTION

English mnemonics, and includes SETUP ("WRITE"), INTERROGATION ("READ"),
and TRANSMISSION-INITIATING commands. In RS-485 (MULTINODE) operation,
every command received at the RS-232/485 Interface Port will evoke a response
from that port (either "ACKNOWLEDGED," "NOT ACKNOWLEDGED," or the re­quested PARAMETER or DATA VALUE(S)). For a complete listing of mnemonic
commands and responses, see Appendix B.

1.10

1.g MNEMONIC COMMANDS

SETUP: CONNECTIONS AND POWERUP

2.a TRANSDUCER CONNECTIONS

2.a.1 THE “STANDARD” ANALOG INPUT CONNECTOR

All 3500 Series instruments except the Model 3510 Thermocouple Conditioner
and the Model 3578 AC Strain Gage Conditioner use the "standard" Analog
Input Connector. Shown in Fig. 2(b), this connector is located on the rear of the
unit. The number of terminals and the specific terminal assignments will depend
on the model itself.

Referring to the appropriate cabling diagram below, connect the wires of your
transducer cable to the corresponding screw terminals of the Analog Input Con­nector. To facilitate cable connection, the front (screw-terminal) portion of the
connector may be removed from the rear (pin) portion, which is mounted on the
internal Analog Input Board. Press hard when reinserting the front portion, to
make sure it is fully engaged (the small clips should snap into place on the rear
portion).

The special CONDITIONER CONNECTORS used by the Model 3510 Thermocou­ple Conditioner and the Model 3578 AC Strain Gage Conditioner are described in
the respective sections below.

2

PLEASE NOTE: CABLE SIGNAL WIRES OR TWISTED WIRE PAIRS SHOULD

ALWAYS BE PROPERLY SHIELDED, AS INDICATED IN THE CABLING DIAGRAMS.
THIS WILL MINIMIZE THE PRODUCTION OF UNWANTED ELECTRICAL NOISE
FROM CAPACITIVE AND INDUCTIVE EFFECTS.

2.a.2 CONNECTING A THERMOCOUPLE TO THE MODEL 3510

The Model 3510 Thermocouple Conditioner's rear Analog Input Board mates
with a special CONDITIONER CONNECTOR (shown in Fig. 2(a) and in Fig. 6,
below), which provides a precision thermistor for reference-junction compensa­tion. This connector contains a screw-terminal pair labelled "+" and "–." The other
two terminals are not used.

Each TC lead should be directly attached to its corresponding screw terminal (it
should never be soldered). The connector itself is "keyed" by a small plastic
insert embedded between a certain terminal-pin pair, which matches a slot in the
rear Analog Input Board. This prevents the connector from being inadvertently
attached upside-down.

Open the connector housing by removing the four screws that hold it together
(two on each side). Be sure to put back the insulating foam block before
reassembling the connector. It's also a good idea to wrap each cable wire
around the respective strain-relief post.

The "shield" wire of the transducer cable should be soldered to the exposed ter­minal of the L-shaped GROUND LUG located under the head of one of the con­nector's two captive screws. This will ensure direct shield contact with the 3510’s
metal case.

Open Thermocouple Detection—In the event of a broken thermocouple wire or
other "open TC" condition, the 3510 will automatically report an indeterminate off-
scale reading—that is, a value well outside the normal range of the TC type for
which it has been set.

2.a TRANSDUCER CONNECTIONS: MODEL 3510

2.1

2

+–

To
Thermocouple
Conditioner
Analog Input
Board

– SIGNAL

+ SIGNAL

SHIELD

Ground
Lug

LOW HI

Strain
Relief
Post

Open TC Detection

Programming Jumpers

This terminal

NOT USED

This terminal

NOT USED

+ +

+ +

SETUP: CONNECTIONS AND POWERUP

Fig. 6 Model 3510
Transducer Cabling

The Model 3510 is normally preset at the factory for positive off-scale "open TC"
indication. However, you may easily reset it for negative indication. Open the
connector housing and locate the "Open TC Detection Programming Jumpers"
(see Fig. 6). You will have to remove the solder drop connecting the middle termi­nal pad to the "HI" (positive) pad, and to place a solder drop between the middle
pad and the "LOW" (negative) pad. Use a fine-point solder gun to heat the solder
drop to be removed, until it has melted sufficiently for you to wipe it off with a
clean rag. Make sure you remove all traces of solder from the jumper pads you
wish to disconnect.

2.2

2.a.3 CONNECTING AN LVDT OR VARIABLE

RELUCTANCE TRANSDUCER TO THE MODEL 3530

With regard to transducer cabling for the Model 3530 LVDT Conditioner, please
note the following:

a. 5-wire LVDT cabling (Fig. 7(a)) or 3-wire variable reluctance transducer

cabling (Fig. 7(c)) is to be used when the cable is under 20 feet in length. In
this case, the +SENSE and –SENSE lines are tied to the corresponding EXCI­TATION lines at the CONDITIONER CONNECTOR.

7-wire LVDT cabling (Fig. 7(b)) or 5-wire variable reluctance transducer
cabling (Fig. 7(d)) is to be used when the cable is 20 feet or longer. In this
case, the +SENSE and –SENSE lines are tied to the corresponding EXCITA­TION lines at the transducer.

b. When wiring an LVDT transducer to the 3530, you should connect both series-

opposed secondary coils to the terminal labelled "CENTER WIRE," as shown
in Figs. 7(a) and 7(b).

c. NOTE THAT THERE ARE SPECIAL +SIGNAL AND –SIGNAL CONNECTIONS

FOR USE WITH LONG-STROKE LVDT'S (FULL-SCALE INPUT OF 0-1, 0-2, OR
0-4 VOLTS/VOLT).

Thus, to allow for the larger input voltages produced by such a sensor, you
would connect its +SIGNAL line to the terminal labelled "HI +SIG," instead of to
the "+SIG" terminal. Similarly, you would connect the –SIGNAL line to the ter­minal labelled "HI –SIG" instead of to the "–SIG" terminal.

2.a TRANSDUCER CONNECTIONS: MODEL 3530

SETUP: CONNECTIONS AND POWERUP

–

SIG

+

SIG

CNTR
WIRE

+

SENS+EX

LVDT INPUT

–EX–

SENS

HI –
SIG

HI +
SIG

–SENSE

+SENSE

+EXCITATION

+SIGNAL

–EXCITATION

–SIGNAL

10K

10K

N/C

SHIELD

SHLD N/C

–

SIG

+

SIG

CNTR
WIRE

+

SENS+EX

LVDT INPUT

–EX–

SENS

HI +
SIG

–SENSE

+SENSE

–EXCITATION

+EXCITATION

+SIGNAL

–SIGNAL

PRIMARY

COIL

SECONDARY

COILS

Sec. 1

Sec. 2

CENTER

WIRE

HI –
SIG

N/C

SHIELD

SHLD N/C

For

Long-Stroke

LVDT's

–

SIG

+

SIG

CNTR
WIRE

+

SENS+EX

LVDT INPUT

–EX–

SENS

HI –
SIG

HI +
SIG

–SENSE

+SENSE

–EXCITATION

+EXCITATION

–SIGNAL

PRIMARY

COIL

Sec. 1

Sec. 2

CENTER

WIRE

For

Long-Stroke

LVDT's

SECONDARY

COILS

+SIGNAL

N/C

SHIELD

SHLD N/C

d. When wiring a variable reluctance transducer to the 3530, you must install a

10-kilohm "half-bridge completion" resistor between the –SIGNAL line and
each of the two EXCITATION lines, as shown in Figs. 7(c) and 7(d).

Fig. 7(a) Model 3530
Transducer Cabling:
5-Wire LVDT Cabling
(under 20 ft. in length)

2

Fig. 7(c) Model 3530

Transducer Cabling:
3-Wire Variable
Reluctance Cabling
(under 20 ft. in length)

Fig. 7(b) Model 3530
Transducer Cabling:
7-Wire LVDT Cabling
(20 ft. or longer)

2.a TRANSDUCER CONNECTIONS: MODEL 3530

2.3

2

–

SIG

+

SIG

CNTR
WIRE

+

SENS+EX

LVDT INPUT

–EX–

SENS

HI –

SIG

HI +
SIG

–SENSE

+SENSE

+EXCITATION

+SIGNAL

–EXCITATION

SHIELD

–SIGNAL

10K

10K

N/CSHLD N/C

SETUP: CONNECTIONS AND POWERUP

Fig. 7(d) Model 3530
Transducer Cabling: 5-Wire Variable
Reluctance Cabling (20 ft. or longer)

2.a.4 CONNECTING A FREQUENCY

SOURCE TO THE MODEL 3540

Fig. 8(a) shows recommended cabling for connecting the Model 3540 Frequen­cy Conditioner to a pulse transformer transducer with two-wire isolated wind-

ings (tachometer, turbine flowmeter, etc.). Fig. 8(b) shows the connection to a

transistor or logic-circuit driver, while Fig. 8(c) shows the connection to a "zero-
velocity" (i.e., true digital output) sensor. For a single-ended input, note that the

–SIG terminal should be tied to the SIG COM terminal, as shown in Fig. 8(b).

Note too that, when used with an open-collector type sensor—such as a zero­velocity sensor—a pull-up resistor of typically 10 kilohms is required between the
terminal to which the +SIGNAL line is tied and the +5V terminal, as shown in Fig.
8(c). For a zero-velocity sensor, the +SIGNAL line is to be tied to the +SIGA termi­nal to eliminate any DC offset (see below).

The Model 3540’s input channel is equipped with a capacitive-coupled input (0.1
µF). This special input may be used with either floating or grounded configura­tions if you require elimination of DC offset or suppression of high-frequency
noise. Figs. 8(d) and 8(e) show how these effects can be achieved.

Elimination of DC Offset—The 0.1-µF capacitive coupling can be used to elimi­nate any positive or negative DC offset that exists for the frequency signal. Sim­ply connect the +SIGNAL line from the frequency source to the +SIGA terminal,
instead of to the normal +SIG terminal (see Fig. 8(d)). The capacitor is here in
series with the +SIGNAL input and allows only AC to pass.

Suppression of High-Frequency Noise—False triggering can sometimes occur,
especially at the low-frequency input range, because of stray pickup of frequen­cies outside the common-mode range. Capacitive coupling of the frequency
input to ground can in such cases serve to suppress unwanted signal noise.
Thus, if you find your frequency reading to be unacceptably unstable or "noisy,"
you should tie the +SIGA terminal to the SIG COM terminal, while maintaining the
normal +SIGNAL connection to the +SIG terminal (see Fig. 8(e)). With reference to
the suppression of high-frequency noise by grounding +SIGA, note that

• it is always recommended for magnetic-pickup sensors; and

• in general, it is NOT to be used with transducers that produce
active output (e.g., TTL logic drivers).

2.4

2.a TRANSDUCER CONNECTIONS: MODEL 3540

SETUP: CONNECTIONS AND POWERUP

SHIELD

SHLD

–SIGNAL

+SIGNAL

–

+

EXCITATION

COM

SIG

SIG

–

SIG

+

FREQUENCY

SOURCE

SIGNAL INPUTS

SIGA

+

5V

–

COM

PWR

5V

+

SHIELD

SHLD

–SIGNAL

+SIGNAL

–

+

EXCITATION

COM

SIG

SIG

–

SIG

+

FREQUENCY

SOURCE

SIGNAL INPUTS

SIGA

+

5V

–

COM

PWR

5V

+

SHLD

EXCITATION

COM

SIG

SIG

–

SIG

+

SIGNAL INPUTS

SIGA

+

5V

–

COM

PWR

5V

+

+SIGNAL

SHLD

EXCITATION

COM

SIG

SIG

–

SIG

+

SIGNAL INPUTS

SIGA

+

5V

–

COM

PWR

5V

+

ZERO-VELOCITY SENSOR

+EXCITATION

+SIGNAL

–EXCITATION

SHIELD

10K

10K Pull-up Resistor (for
use with open-collector
sensor)

SHLD

EXCITATION

COM

SIG

SIG

–

SIG

+

SIGNAL INPUTS

SIGA

+

5V

–

COM

PWR

5V

+

+SIGNAL

2

Fig. 8(a) Model 3540 Transducer
Cabling: Differential (Floating)
Frequency Input

Fig. 8(b) Model 3540 Transducer
Cabling: Single-Ended (Grounded)
Frequency Input

Fig. 8(c) Model 3540
Transducer Cabling:
Input from a Zero­Velocity Sensor

Fig. 8(d) Model 3540 Transducer
Cabling for Elimination of DC Offset

Fig. 8(e) Model 3540 Transducer
Cabling for Suppression of High­Frequency Noise

2.a TRANSDUCER CONNECTIONS: MODEL 3540

2.5

2

SHIELD

N/CSHLD

–SIGNAL

+SIGNAL

Reg. Power

Supply

(if required)

–

+

ANALOG

SIGNAL

SOURCE

Add wire for

floating input

POWER

OUT

SIGNAL

INPUT

± 40 MA MAX

COM

SIG

SIG

–

SIG

+

–12VCOM+12V

N/CSHLD

POWER

OUT

SIGNAL

INPUT

± 40 MA MAX

COM

SIG

SIG

–

SIG

+

–12VCOM+12V

SHIELD

+SIGNAL

–EXCITATION

2K to

10K

+EXCITATION

N/CSHLD

POWER

OUT

SIGNAL

INPUT

± 40 MA MAX

COM

SIG

SIG

–

SIG

+

–12VCOM+12V

SHIELD

+SIGNAL

–EXCITATION

+EXCITATION

DC-to-DC

LVDT

–SIGNAL

Tie the –SIG and SIG COM

terminals if a –SIGNAL wire from

the transducer is not available

SETUP: CONNECTIONS AND POWERUP

2.a.5 CONNECTING A VOLTAGE
SOURCE TO THE MODEL 3560

Fig. 9(a) gives standard cabling for connecting to the Model 3560 Voltage Con­ditioner a general ANALOG SIGNAL SOURCE, floating or grounded, with its own

power supply (if required); Fig. 9(b), for connecting an EXTERNAL ZERO-TO-FULL­SCALE POTENTIOMETER with a resistance from 2 to 10 kilohms, using the instru-
ment's ±12-V excitation; and Fig. 9(c), for connecting an EXTERNAL DC-TO-DC
LVDT, again using the ±12-V excitation. As shown in Fig. 9(a), a floating input is to
be grounded by tying the transducer's –SIGNAL line to the SIG COM terminal.
When a –SIGNAL line from the transducer is not available, the –SIG and SIG COM
terminals should be connected by a jumper wire (as in Figs. 9(b) and 9(c)).

Fig. 9(a) Model 3560 Transducer
Cabling: General Voltage Source

2.6

2.a TRANSDUCER CONNECTIONS:MODEL 3560

Fig. 9(b) Model 3560 Transducer
Cabling: External Potentiometer

Fig. 9(c) Model 3560 Transducer
Cabling: External DC-to-DC LVDT

SETUP: CONNECTIONS AND POWERUP

See Fig. 5(b)

–

SHLD

SHUNT CAL

CONTROL

STRAIN GAGE INPUT

SIG

+–

COM

SIG

+

EX

+

SENS

+

SENS

–

EXSENS

CAL–

SIGCOM

PWR

SHIELD

+SENSE

+EXCITATION

–EXCITATION

–SIGNAL

+SIGNAL

–SENSE

CAL
SENSE

See Fig. 5(b)

–

SHLD

SHUNT CAL

CONTROL

STRAIN GAGE INPUT

SIG

+–

COM

SIG

+

EX

+

SENS

+

SENS

–

EXSENS

CAL–

SIGCOM

PWR

SHIELD

+SENSE
+EXCITATION

–EXCITATION

–SIGNAL

+SIGNAL

–SENSE

CAL SENSE

UNCONNECTED WIRE
(PAIRED WITH "CAL SENSE")

2.a.6 CONNECTING A DC STRAIN GAGE
TRANSDUCER TO THE MODEL 3570

Four-wire strain gage cabling (Fig. 10(a)) is to be used with the Model 3570 DC
Strain Gage Conditioner when the cable is under 20 feet in length. In this case,

the +SENSE and –SENSE lines are tied to the corresponding EXCITATION lines,
and also the CALIBRATION SENSE line to the +SIGNAL line, at the CONDITIONER

CONNECTOR.

Eight-wire strain gage cabling (Fig. 10(b)) is to used when the cable is 20 feet or
longer. In this case, the +SENSE and –SENSE lines are tied to the corresponding
EXCITATION lines, and the CALIBRATION SENSE line to the +SIGNAL line, at the
transducer. Note also the wire connected to the –SIGNAL line at the transducer,
but left unconnected at the instrument. This wire is to be paired with the CAL
SENSE line, as shown, for shielding purposes.

2

Fig. 10(a) Model 3570
Transducer Cabling:
4-Wire Cabling
(under 20 ft. in length)

Fig. 10(b) Model 3570
Transducer Cabling:
8-Wire Cabling
(20 ft. or longer)

2.a TRANSDUCER CONNECTIONS: MODEL 3570

2.7

2

A
B
C
D
E
F
H
J
K
L

1
2
3
4
5
6
7
8
9

10

+SIGNAL

CONDITIONER CONNECTOR

–EXCITATION

+EXCITATION

–SIGNAL

–SENSE

+SENSE

CAL SENSE

SHIELD

Connector pins shown as viewed
from rear (cable) side of
connector.

Ground Lug

A
B
C
D
E
F
H
J
K
L

1
2
3
4
5
6
7
8
9

10

CONDITIONER CONNECTOR

+EXCITATION

+SENSE

SHIELD

Connector pins shown as viewed
from rear (cable) side of
connector.

Ground Lug

+SIGNAL

–EXCITATION

–SIGNAL

–SENSE

CAL SENSE

Unconnected wire
(Paired with "CAL SENSE")

SETUP: CONNECTIONS AND POWERUP

2.a.7 CONNECTING AN AC STRAIN GAGE
TRANSDUCER TO THE MODEL 3578

As shown in Fig. 2(a), the Model 3578 AC Strain Gage Conditioner's Analog
Input Board mates with a special CONDITIONER CONNECTOR. This connector
allows direct solder-terminal attachment of cable leads. The connector's internal
solder terminals are labelled 1 through 10 and A through L. The connector is
"keyed" by small plastic inserts embedded between certain terminal-pin pairs,
each of which matches a slot in the conditioner's Analog Input Board. This pre­vents the connector from being inadvertently attached upside-down.

Open the connector housing by removing the four screws that hold it together.
Secure the cable by means of one of the internal clamp bars.

The "shield" wire of the transducer cable should be soldered to the exposed ter­minal of the L-shaped GROUND LUG located under the head of one of the con­nector's two captive screws. This will ensure direct shield contact with the 3578’s
metal case.

Fig. 11(a) Model 3578
Transducer Cabling: 4-Wire
Cabling (under 20 ft. in length)

2.8

2.a TRANSDUCER CONNECTIONS: MODEL 3578

Fig. 11(b) Model 3578
Transducer Cabling: 8-Wire
Cabling (20 ft. or longer)

SETUP: CONNECTIONS AND POWERUP

A
B
C
D
E
F
H
J
K
L

1
2
3
4
5
6
7
8
9

10

CONDITIONER CONNECTOR

–SENSE

+SENSE

SHIELD

External
SHUNT
CALIBRATION
RESISTOR
(User­Supplied)

+SIGNAL

A
B
C
D
E
F
H
J
K
L

1
2
3
4
5
6
7
8
9

10

CONDITIONER CONNECTOR

+EXCITATION

+SENSE

SHIELD

Connector pins shown as viewed
from rear (cable) side of
connector.

Ground Lug

+SIGNAL

–EXCITATION

–SIGNAL

–SENSE

A

D

C

B

CAL

(E)

Unconnected wire

(Paired with "LEBOW CAL")

LEBOW CAL

Fig. 11(c) Model 3578
Transducer Cabling:
Installation of User’s
External Shunt
Calibration Resistor

Fig. 11(d) Model 3578
Transducer Cabling: 8-Wire
Cabling to LEBOW 1600 SERIES
TRANSDUCER (ONLY)

2

Four-wire strain gage cabling (Fig. 11(a)) is to be used when the cable is under 20
feet in length.

The Model 3578 is equipped with an internal 59-KΩ, 0.1% calibration resistor for
the standard "shunt" calibration technique described in Section 4. If you wish to
use your own external shunt resistor, it should be tied between Pin 5 of the CON­DITIONER CONNECTOR and the transducer's +SIGNAL line, as shown in Fig.
11(c). In this case, "CAL SENSE" (Pin 4) is not used.

With cabling under 20 feet in length, the +SENSE and –SENSE lines are tied to the
corresponding EXCITATION lines at the CONDITIONER CONNECTOR. Also, the
CALIBRATION SENSE line from Pin 4—or the optional external SHUNT RESISTOR
line from Pin 5—is tied to the +SIGNAL line at the CONDITIONER CONNECTOR.

Eight-wire strain gage cabling (Fig. 11(b)) is to used when the cable is 20 feet or
longer.* As before, you can install your own shunt calibration resistor between
Pin 5 and the +SIGNAL line, in which case Pin 4 is not used.

With cabling of 20 feet or over, the +SENSE and –SENSE lines are tied to the cor­responding EXCITATION lines at the transducer. Also, the CALIBRATION SENSE

* NOTE: This cabling is to be used when connecting the Model 3578 to a Lebow 1800 Series

Transducer, regardless of cable length.

2.a TRANSDUCER CONNECTIONS: MODEL 3578

2.9

2

SETUP: CONNECTIONS AND POWERUP

line from Pin 4—or the optional external SHUNT RESISTOR line from Pin 5—is tied
to the +SIGNAL line at the transducer. Note the wire connected to the –SIGNAL
line at the transducer, but left unconnected at the instrument. This wire is to be
paired with the CAL SENSE or SHUNT RESISTOR line for shielding purposes.

Special 8-wire cabling (shown in Fig. 11(d)) is required for connecting the 3578 to
a Lebow 1600 Series Transducer. The cable should be shielded in four pairs,
as shown in the figure, with the shield open at the transducer end. Also note that

• SENSE and EXCITATION lines should be tied at the transducer.

• The conditioner's Pin 5 ("LEBOW CAL") is to be connected to the "CAL" pin on
the Lebow sensor (Pin 4 is not used in this case).

• You should leave the last (extra) wire unconnected at both ends, and pair it
with the "LEBOW CAL" line for the fourth shield.

• THE MODEL 3578 MUST BE INTERNALLY SET TO "SIGNAL COMMON"

MODE. CONTACT THE FACTORY FOR PRECISE INSTRUCTIONS.

2.b RS-232 (“SINGLE-NODE”) CONNECTIONS

You should set the RS-232/485 Interface Port for RS-232 operation when you
want your 3500 Series instrument to communicate with a single computer, termi­nal, buffered printer, or other RS-232-C device. To do so, you need only MAKE
SURE THAT THE INSTRUMENT'S CURRENT NODE NUMBER IS "0" (ZERO). You
will be shown in Section 3.a.3 how to set the node number and other necessary
RS-232 communications parameters via the front-panel buttons.

If you did not order a specific RS-232-C Interface Cable with your 3500 Series
instrument, you will have to provide your own connection. Fig. 12 shows suggest­ed cabling between the instrument and a computer, terminal, printer, etc., that
uses a 25-Pin RS-232-C Connector. FOR MAXIMUM DATA-TRANSFER SPEED
AND ACCURACY, A "FULL HANDSHAKE" INTERCONNECTION IS GENERALLY
RECOMMENDED (Fig. 12(a)). However, cabling is also given for "INCOMING
HANDSHAKE ONLY" and "NO HANDSHAKE" situations (Figs. 12(b) and 12(c),
respectively). Following RS-232-C conventions, the device at each end of the
interface is seen as "DATA TERMINAL EQUIPMENT (DTE)."

Fig. 13 shows suggested cabling between a 3500 Series instrument and a com­puter, terminal, printer, etc., that uses a 9-Pin D-Subminiature Connector for its RS­232-C interface (such as an IBM PC/AT).

Please note that the cabling in Figs. 12 and 13 is by no means definitive. In all
cases, you should carefully study the literature accompanying the specific RS­232-C device you wish to connect to your instrument, to determine the cable
arrangement that will create the "handshake" you need (if any). On some devices,
for example, the DATA TERMINAL READY (DTR) signal may have a different
name (such as NOT BUSY) and may even appear on a pin other than No. 20 or
No. 4.

2.10

2.b RS-232 (“SINGLE-NODE”) CONNECTIONS

SETUP: CONNECTIONS AND POWERUP

Computer

or other RS-232-C Device

25-Pin RS-232-C
Connector

2
3
4

5
8

2
3
5
6
7

20

RECEIVE

TRANSMIT

DTR

COMMON

CTS

TRANSMIT
RECEIVE
CTS
DSR
COMMON
DTR

FULL HANDSHAKE

(RECOMMENDED)

*

* Required for IBM and IBM-compatible computers.

DATA (RS-485)
RECEIVE (RS-232)
TRANSMIT (RS-232)
DATA TERMINAL READY (RS-232)
COMMON
DATA (RS-485)
+12 V (RS-485)
CLEAR TO SEND (RS-232)
SHIELD

RS-232/485 Interface
Connector—Male
(see Fig. 2)

1

2345

6

789

1
2
3
4
5
6
7
8
9

Pin No. Function

3500 Series

Instrument

25-Pin RS-232-C
Connector

2
3
4
5
8

2
3
5
7

20

RECEIVE

TRANSMIT

DTR

COMMON

CTS

TRANSMIT
RECEIVE
CTS
COMMON
DTR

INCOMING HAND-

SHAKE ONLY

Computer

or other RS-232-C Device

3500 Series

Instrument

25-Pin RS-232-C
Connector

2
3
4

5
8

2
3
4
5
7

20

RECEIVE

TRANSMIT

DTR

COMMON

CTS

TRANSMIT
RECEIVE
RTS
CTS
COMMON
DTR

NO HANDSHAKE

Computer

or other RS-232-C Device

3500 Series

Instrument

Fig. 12 Suggested RS-232-C
Interface Connections
(to 25-Pin RS-232-C Connector)

Fig. 12(a)

2

Fig. 12(c)

Fig. 12(b)

2.b RS-232 (“SINGLE-NODE”) CONNECTIONS

2.11

2

9-Pin RS-232-C
Connector

2
3
4
5
8

2
3
4
5
6
8

RECEIVE

TRANSMIT

DTR

COMMON

CTS

RECEIVE
TRANSMIT
DTR
COMMON
DSR
CTS

Computer

or other RS-232-C Device

SETUP: CONNECTIONS AND POWERUP

Fig. 13 Suggested RS-232-C Interface
Connections (to 9-Pin RS-232-C Connector)

2.c RS-485 (“MULTINODE NETWORK”) CONNECTIONS

You can also set a 3500 Series instrument's RS-232/485 Interface Port for RS-485
intercommunications with a multidrop network of up to 99 independent Daytronic
signal conditioning instruments (3500 Series, 4000 Series with “N” Option, and/or
5000 Series)—all controlled by a supervisory computer with RS-232-C I/O. To do
so, YOU MUST ASSIGN THE 3500 INSTRUMENT A UNIQUE NONZERO NODE
NUMBER. You will be shown in Section 3.a.4 how to set the node number and
other necessary RS-485 communications parameters via the front-panel buttons.

IMPORTANT: BEFORE NETWORK INTERCONNECTIONS ARE ESTABLISHED,

YOU SHOULD SET UP EACH 3500 SERIES NETWORK "NODE" INDIVIDUALLY, BY
MEANS OF THE SETUP PROCEDURES GIVEN IN SECTIONS 3 AND 4.

While it is possible to make separate network "branches" issue from a single
node, such an arrangement can lead to less than optimum signal-to-noise ratio
because of unwanted reflections over interface lines. A strictly linear configura­tion like that shown in Fig. 14(a) is therefore highly recommended.

For proper conversion of interface levels, you must attach a Model 5E485

RS232-to-RS485 Adaptor to the computer's RS-232-C port, via the Model 5E25
DB25 Male-to-Female Converter, as shown in Fig. 14(a).* The adaptor’s RS-

485 Interface Port should then connect directly to the RS-232/485 Interface Port
of the first network node—which should be a 3500 Series instrument—via the
cabling given in Fig. 14(b). Note that the +12-V supply of the first node (when it is
a 3500 instrument) is used to power the Model 5E485, as shown in Fig. 14(b).**
Fig. 14(c) shows the pin-to-pin cabling to be used between each pair of adjacent
3500 instrument nodes, or between a 3500 node and an adjacent 4000 Series
node. Interconnections between a 3500 or 4000 node and a separately powered
5000 node are shown in Fig. 14(d).

* The Model 5E25 is not necessary when the computer is equipped with a Model PC-HSICA

High-Speed Serial Interface Card. Also, you may use your own RS-232-to-RS-485 converter
in place of the Model 5E485, if desired. Converter connections will depend on whether there
are separate "XMIT" and "RCV" pairs or a single "485 DATA" pair. Contact the factory for
instructions.

** If the network contains one or more 5000 Series instrument nodes, a separate power source

of 10 to 40 V-DC (nominal 24 V-DC recommended) is required to power both the 5E485 and
the 5000 nodes—in which case the +12-V pin on every 3500 node should not be used. See any
5000 instrument instruction manual for details.

2.12

2.c RS-485 (“MULTINODE NETWORK”) CONNECTIONS