idronaut Ocean Seven 307 Operator's Manual

TABLE OF CONTENTS

1. Introduction 1

1.1. RS485 interface 1

1.2. OEM module wiring 2

1.3. EMC/EMI 2

1.4. OEM module firmware 2

1.4.1. Firmware 2

1.4.2. Data processing 2

1.4.3. Operations 3

2. Conductivity module 4

2.1. Electronic specifications 4

2.2. Physical characTEristics 4

2.3. Ground connection and shielding of the Conductivity module 4

2.4. The seven-ring conductivity sensor 5

3. Temperature module 6

3.1. Electronic specifications 6

3.2. Physical characeristics 6

3.3. The temperature sensor 7

4. COMBINED Pressure and temperature module 8

4.1. Electronic specifications 8

4.2. Physical characeristics 8

4.3. Pressure sensor 9

4.4. The temperature sensor 9

5. High precision pressure module 10

5.1. Technical specifications 10

5.2. Accuracy and Precision 11

5.3. Polynomial Compensation 11

5.4. Communication protocol 11

6. Installation and Start-up 12

6.1. Installation 12

6.2. ITERM program installation 12

6.3. Power supply 12

6.4. How to operate the OEM module 12

6.4.1. Verbose vs Non-Verbose 13

6.5. OEM module Start-up procedure 13

6.6. Installation of OEM module in aN RS485 network of sensors 13

7. OEM module COMMUNICATION PROTOCOL 14

7.1. Command message structure 14

7.2. Answer message structure 14

7.3. Communication protocol commands 15

7.4. Communication protocol mode 15

8. ITerM programME 16

8.1. Distributed files 16

8.2. Programme menus and functions 16

8.3. Toolbar 18

8.4. Start-up switches 18

9. OEM307- Pinouts 19

IDRONAUT – Brugherio (MB) OCEAN SEVEN 307 02-2017

IMPORTANT REMARKS

CONDUCTIVITY SENSOR

1) To obtain the best accuracy, the conductivity sensor and therefore the probe sensor
head, must be immersed in clean seawater for at least 15 minutes before
measurements. For fresh water application, the sensor does not require any hydration.

2) When the conductivity sensor is not in use, it is kept dry. Therefore, when the
conductivity sensor is placed in water, very small bubbles may remain attached to the
platinum ring electrodes (seven). If such a thing happens, the measured value of
conductivity will be lower than the true one. To remove these air bubbles, degrease
the inside of the conductivity cell using cotton buds wetted with the Conductivity
Sensor Cleaning Solution or with liquid soap. Gently rotate the cotton bud against the
whole internal surface of the quartz cell. This will wet the platinum electrodes, thus
reducing the surface tension of the cell and considerably decreasing the risk of trapped
air bubbles.

LIFETIME AND HOW TO REPLACE THE IDRONAUT SENSORS

The IDRONAUT sensors are all pressure compensated and, in particular, the physical
sensors (temperature and conductivity) can last many years, if properly used. They are high­quality sensors, as they are well known by oceanographers to measure salinity with great
accuracy. The wire sensors are tin soldered on their respective connection points placed on
the printed circuit board. All sensor heads have a standard 12 mm diameter and are
provided with two o-rings (Parker 12-2) for sealing.

IDRONAUT – Brugherio (MB) OCEAN SEVEN 307 02-2017

Copyright statement

Copyright @ 1982 – 2015 IDRONAUT S.r.l. - OCEAN SEVEN and IDRONAUT are registered trademarks of IDRONAUT S.r.l. All rights
reserved.
Other products and services mentioned in this document are identified by the trademarks or service marks of their respective companies
or organizations. No part of this Operator’s Manual, or any software included with it, may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, including photocopying, electronic, mechanical, recording or otherwise, without the prior
written permission of the copyright holder.
IDRONAUT S.r.l. provides this document as it is without warranty of any kind either expressed or implied including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose.
IDRONAUT S.r.l. may make changes of improvements in the equipment, software, firmware, or specifications described in this document
at any time and without notice. These changes may be incorporated in new releases of this document. This document may contain
technical inaccuracies or typographical errors.
IDRONAUT S.r.l. waives responsibility of any labour, materials, or costs incurred by any person or party as a result of using this document
or the equipment described in this document.
IDRONAUT S.r.l. shall not be liable for any damages (including, but not limited to, consequential, indirect or incidental, special damages,
or loss of profits or data) even if they were foreseeable and IDRONAUT S.r.l. has been informed of their potential occurrence arising out
of or in connection with this document or its use.
IDRONAUT S.r.l. shall not be liable for any damages (including, but not limited to, consequential, indirect or incidental, special damages,
or loss of profits or data) even if they were foreseeable and IDRONAUT S.r.l. has been informed of their potential occurrence arising out
of or in connection with the use of the equipment described in this document.

Agreement

Object of this agreement is the OCEAN SEVEN 307 OEM SMART LOW POWER CTD SENSORS. IDRONAUT S.r.l. agrees to provide the
“OCEAN SEVEN 307 OEM SMART LOW POWER CTD SENSORS”, herewith below identified as “OEM MODULE”, under the terms
and conditions of this agreement. The precise terms and conditions follow.

TERMS AND CONDITIONS

The “OEM MODULES” hardware, firmware, sensor and accompanying documentation are protected by European Community copyright
law and also by International Treaty provisions. Any use of this equipment or part of this equipment in violation of copyright law or the
terms of this agreement will be prosecuted to the best of our ability.

OWNERSHIP

The “OEM MODULE” and each hardware, firmware or sensor are property of IDRONAUT S.R.L. which reserves the rights to use the
whole “OEM MODULE”, part of its components specifically developed for the “OEM MODULE” in other IDRONAUT S.r.l. products.
The “OEM MODULE” is sold to you for use only under the terms of this Agreement. You acknowledge and agree that the product consists
of proprietary, unpublished product of IDRONAUT S.r.l. and any third party licensors, protected under copyright law and trade secret
laws. All right, title and interest in and to the “OEM MODULE” are and shall remain with IDRONAUT S.r.l.

WARRANTY

The “OEM MODULE” is covered by a one-year limited warranty that extends to all parts and labour and covers any malfunction that is
due to poor workmanship or due to errors in the manufacturing process. The warranty does not cover shortcomings that are due to the
design, nor does it cover any form of consequential damage because of errors in the measurements. If there is a problem with your “OEM
MODULE”, first try to identify the problem by following the procedure outlined in the troubleshooting section of this manual if any.
Please contact your representative or IDRONAUT S.r.l. if the problem is identified as a hardware problem or if you need additional help
in identifying the problem. Please make sure to contact IDRONAUT S.r.l. to obtain the relevant instructions before the “OEM
MODULE” is returned to IDRONAUT.
For systems under warranty, IDRONAUT S.r.l. will attempt to ship replacement parts before the malfunctioning part is returned. We
encourage you to contact us immediately if a problem is detected and we will do our best to minimize the downtime. Every effort has
been made to ensure the accuracy of this manual. However, IDRONAUT S.r.l. makes no warranties with respect to this documentation
and disclaims any implied warranties of merchantability and fitness for a particular purpose. IDRONAUT S.r.l. shall not be liable for any
errors or for incidental or consequential damages in connection with the furnishing, performance or use of this manual or the examples
herein. The information in this document is subject to change without notice.

OTHER RESTRICTIONS

You may not reverse engineer, de-compile, or disassemble the “OEM MODULE” hardware, sensor and firmware, except to the extent the
foregoing restriction is expressly prohibited by applicable law. IDRONAUT S.r.l. may make changes of improvements in the equipment,
hardware, firmware, or specifications described in this document at any time and without notice. These changes may be incorporated in
new releases of this document. This document may contain technical inaccuracies or typographical errors.

IDRONAUT- Brugherio (MB) OCEAN SEVEN 307 02-2017

HIGH RISK ACTIVITIES

The “OEM MODULE” is not fault-tolerant and is not designed, manufactured or intended for use as on-line control equipment in
hazardous environments requiring fail-safe performance, such as in the operation of nuclear facilities, aircraft navigation or
communication systems, air traffic control, direct life support machines, or weapons systems, in which the failure of the “OEM MODULE”
could lead directly to death, personal injury, or severe physical or environmental damage ("High Risk Activities"). IDRONAUT S.r.l.
specifically disclaims any express or implied warranty of fitness for High Risk Activities.

CLEANING INSTRUCTIONS

Before the returned “OEM MODULE” can be serviced, equipment exposed to biological, radioactive, or toxic materials must be cleaned
and disinfected. Biological contamination is presumed for any instrument, probe, or other device that has been used with wastewater.
Radioactive contamination is presumed for any instrument, probe or other device that has been used near any radioactive source. If a
“OEM MODULE”, or other part is returned for service without following the cleaning instructions, and if in our opinion it represents a
potential biological or radioactive hazard, our service personnel reserve the right to withhold service until appropriate cleaning,
decontamination has been completed.
When service is required, either at the user's facility or at IDRONAUT, the following steps must be taken to insure the safety of our service
personnel.

 In a manner appropriate to each device, decontaminate all exposed surfaces, including any containers. 70% isopropyl alcohol

or a solution of 1/4 cup bleach to 1-gallon tap water are suitable for most disinfecting. Instruments used with wastewater may
be disinfected with 5% Lysol if this is more convenient to the user.

 The user shall take normal precautions to prevent radioactive contamination and must use appropriate decontamination

procedures should exposure occur. If exposure has occurred, the customer must certify that decontamination has been
accomplished and that no radioactivity is detectable by survey equipment.

 Any product being returned to the IDRONAUT S.r.l. Laboratory for service or repair should be packed securely to prevent

damage.

 Cleaning must be completed on any product before returning it to IDRONAUT S.r.l.

DISPOSAL OF WASTE EQUIPMENT BY USERS IN THE EUROPEAN UNION

The recycling bin symbol on the product or on its packaging indicates that this product must not be disposed of with your other waste. It
is your responsibility to dispose of your waste equipment by handling it over to a designated collection point for the recycling of waste
electrical and electronic equipment. The separate collection and recycling of your waste equipment at the time of disposal will help to
conserve natural resources and ensure that it is recycled in a manner that protects human health and the environment. For more
information about where you can drop off your waste equipment for recycling, please contact your local city office, your waste disposal
service.

IDRONAUT- Brugherio (MB) OCEAN SEVEN 307 02-2017

OS307 OEM Modules Operator’s Manual 1

Four different OEM modules are available:

 Conductivity.
 Temperature.
 Combined pressure and temperature.
 High precision 0.01% pressure.

1. INTRODUCTION

The OCEAN SEVEN 307 CTD digital OEM modules make it easy to interface the full
ocean IDRONAUT Conductivity, Temperature and Pressure sensors with third-party
equipment like data loggers, via the built-in RS485 digital interface and a simple
communication protocol. The modules have high-accuracy, high-resolution
preamplifiers and the processing power needed to provide, in real time through the
RS485 interface, the digital output in engineering units.
The module preamplifiers are temperature compensated, thus further enhancing the
measurement accuracy. The modules can be connected together to create an “RS485”
network of intelligent sensors.

1.1. RS485 INTERFACE

The physical connection is provided by the RS485 serial interface. This guarantees
good interference immunity and enables a flexible bus structure, i.e. several OEM
modules can be managed as slaves by a single master. Five different signals and wires
are used to integrate the OEM module with a data logger or a personal computer. Two
of them: GND and VDC+ are used to give the power supply voltage to the module;
two signals (RS485 A, RS485 B) are used to communicate with the module and one
signal can be used to switch ON/OFF the module electronics.
In order to operate several OEM modules at one serial interface, they are simply all
connected in parallel (RS485 A, RS485 B, GND and +Vcc). Before incorporating the
OEM module into the bus, each OEM module must be configured using a different
address.
It is possible to configure a network with a maximum of 9 OEM modules. The
connection must correspond to “EIA RS485” specification.
The MAX3471 RS485 driver is used in the OEM modules. This driver is slew-rate
limited. A 4K7 OHM bias resistor is provided in the OEM module electronics. Voltage
protection is installed on both lines (RS485 A and RS485 B) in the driver. The common
mode voltage relative to GND is –7V ... + 10 V. This voltage must not be exceeded in
any circumstance.
Data is transmitted serially via the bus.

The following formats apply:

 1 start bit.
 8 data bit.
 1 stop bit.
 No Parity.
 38400 baud.

This results in 10 bits per transmission byte.

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OS307 OEM Modules Operator’s Manual 2

1.2. OEM MODULE WIRING

The OS307 OEM modules come complete with a wiring to power and communicate
with the module.

AMP MODU-II 4x2 female connector (AMP 280365):

(1)

Pin Colour Description

1 Black GND
2 Red VDD
4 Violet RS485 A
5 Green RS485 B
8 Yellow Power inhibits (CMOS input

max 1mA@5VDC)

(2)

3, 6, 7 unused.

(1) Mating connector: “AMP 280631”.
(2) Tie it to ground or leave disconnected to switch off the module (internally pulled down).

Connect to a +5V 1mA maximum to switch on the module.

1.3. EMC/EMI

The OS307 OEM modules have been designed to respect the common rules about the
electromagnetic compatibility and to reduce the electromagnetic emissions to the
minimum. Do not expose the OEM modules to excessive electromagnetic radiations to
avoid the decay of performance or malfunction of the OEM modules.

1.4. OEM MODULE FIRMWARE

The description of the OEM module operations follows.

1.4.1. Firmware

The OS307 OEM modules are managed by a dedicated firmware, which takes care to
acquire, process and transmit the readings from the sensors in real time or when
interrogated.
Moreover, through dedicated commands and functions, the management firmware
allows the configuration of the working parameters and calibration coefficients.
Communication with the OEM modules is managed by a dedicated communication
protocol (see the below description and attached document).

1.4.2. Data processing

The OS307 OEM module firmware processes the sensor readings and transmits
acquired data through the RS485 serial interface. If the module is properly configured,
acquired data is converted into engineering units by means of a 2nd order polynomial
interpolation before the transmission. A dedicated algorithm, if configured, thermally
compensates the sensor electronic pre-amplifier by reading the electronic board
temperature in real time.

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OS307 OEM Modules Operator’s Manual 3

Wait state

Comm. state

session.

nt state

cmd. state

command

If addressed switch to the

If receive the correct

1.4.3. Operations

Once switched on, the OEM module waits for communications from the host controller
monitoring the RS485 communications. Each module has its own address and, thanks
to the RS485 interface, more than one module can be controlled from a single host to
create a network of interconnected sensors. If a valid address is recognised, the OEM
module starts to communicate with the host answering the received commands.

communication state

When properly
addressed starts
a
communication

command, switch to the cmd.
execution state

Wait spying

network

communications

Execute the

requested

Measureme

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OS307 OEM Modules Operator’s Manual 4

2. CONDUCTIVITY MODULE

A dedicated high-accuracy preamplifier and associated 18-bit
analogue to digital converter interface the IDRONAUT 7-ring
conductivity cell. The preamplifier does not contain any
electronic adjustment (trimpot) and uses high-stability
resistors 0.05% 1ppm instead and a sophisticated data
processing algorithm.
The firmware automatically compensates for any thermal drift
of the module electronics and calculates the conductivity value
in mS/cm in real time.

Measurement specifications

Parameter Range Accuracy
Resolution
Conductivity 0..+90 mS/cm(*) ± 0.003 mS/cm 0.0003 mS/cm

(*) By reducing the range to 0..70 mS/cm, the resolution becomes 0.0002

2.1. ELECTRONIC SPECIFICATIONS

Real-time data output rate: 4 Hz.
Interface: RS485.
A/D Converter: 18-bit SAR.
Communication protocol: SSP (Simple Sensor Protocol).

Power supply:
Voltage: 3.0..14VDC +/- 10%, nominal 3.6.VDC
Run: 30 mA.

Operating temperature: -1..+70 °C.

2.2. PHYSICAL CHARACTERISTICS

Dimensions (LxWxH): 60x35x30 mm.

Holding: 1 x 2mm insulated hole.

Weight: 0.045 kg.

Connector: 10x2-pin female SAMTEC CLT-110-02-G-D-A,

mating connector male SAMTEC TMMH-110-04­G-DV-A

. (1)

PCB Material: glass reinforced fibre, thickness 1.6 mm and 4

layers with solder resist and silkscreen.

(1) A wiring ending with an 8-pin AMP MODU-II connector is provided instead. The AMP MODU-II mating

connector and contact are provided.

2.3. GROUND CONNECTION AND SHIELDING OF THE CONDUCTIVITY MODULE

The conductivity sensor, when immersed in water through its external rings, creates a
direct connection between the OEM Module electronic ground and the seawater.
Therefore, due to the lack of galvanic insulation, the power supply ground is directly
connected with the water when the conductivity sensor is immersed. It is therefore

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OS307 OEM Modules Operator’s Manual 5

important to avoid grounds loop or stray currents in the proximity of the sensor to
avoid noise in the conductivity measurements.

2.4. THE SEVEN-RING CONDUCTIVITY SENSOR

The conductivity sensor is a unique flow-through self-flushed cell with seven platinum
ring electrodes. The central ring is excited with alternate current flowing to both the
outermost rings. The two adjacent pairs of rings sense the relative drop in voltage due
to the electrical conductivity of the measured water. The outermost pair of rings is
grounded to shield the measuring cell from any outside electrical interference. The
cell is mounted in a special cylindrical plastic body, which guarantees thermic
insulation and is filled with silicone oil and provided with a rubber bellow to achieve
pressure compensation. The conductivity sensor has the advantage that it can be used
in both clean and dirty water without the fear of contamination. Should electrode
contamination occur, they can be easily cleaned (even with up to 30% hydrochloric
acid) without affecting its performance or requiring re-calibration. Because of its big
internal diameter and short length, the cell does not need a pump, as it is easily flushed
during profiles. Time constant of the conductivity sensor is 50 ms, at 1 meter per
second water flow.

Measurement cell: 7 platinum rings deposited inside a

quartz cell, diameter 8 mm,

length 45 mm.
Max pressure: 700 bar.
Sensor body: black plastic and titanium.
Compensation: automatic compensation of the

pressure and thermal effect on the

cell geometry is performed by the

acquisition software.
Life: unlimited.
Calibration frequency: yearly.
Maintenance: cleaning using the IDRONAUT

“Conductivity sensor cleaning

solution”.

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OS307 OEM Modules Operator’s Manual 6

3. TEMPERATURE MODULE

A dedicated high-accuracy preamplifier and associated 24-bit delta sigma analogue to
digital converter interface the Pt-100 IDRONAUT
temperature. The preamplifier does not contain any
electronic adjustment (trimpot) and uses high stability
VISHAY resistors, 0.05% 1ppm as a reference. The OEM
module firmware automatically compensates for any
thermal drift of the module electronics and calculates the
temperature value in °C in real time. Three different ranges
and accuracies are foreseen. The standard module is
calibrated for the first measuring range only. Calibration in
the range +40..+105 must be expressly requested.

Measurement specifications

Parameter Range Accuracy Resolution
Temperature -5..+ 40 °C ± 0.003 °C 0.001 °C

+40..+105 °C ± 0.030°C 0.001 °C

3.1. ELECTRONIC SPECIFICATIONS

Real-time data output rate: 4 Hz.
Interface: RS485.
A/D Converter: 24-bit DS.
Communication protocol: SSP (Simple Sensor Protocol).

Power supply:
Voltage: 3.0..14 VDC +/- 10%, nominal 3.6 VDC.
Run: 30 mA.

Operating temperature: -1..+70 °C.

3.2. PHYSICAL CHARACERISTICS

Dimensions (LxWxH): 50x35x30 mm.

Holding: 2 x 3mm insulated holes.

Weight: 0.045 kg.

Connector: 10x2-pin female SAMTEC CLT-110-02-G-D-A,

mating connector male SAMTEC TMMH-110-04­G-DV-A.

(1)

PCB Material: glass reinforced fibre, thickness 1.6 mm and 4

layers with solder resist and silkscreen.

(1) A wiring ending with an 8-pin AMP MODU-II connector is provided instead. The AMP MODU-II

mating connector and contact are provided.

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OS307 OEM Modules Operator’s Manual 7

3.3. THE TEMPERATURE SENSOR

The temperature sensor is a platinum resistance thermometer (type Pt 100 ohms at 0o
C), fitted on a thin stainless steel housing, able to withstand up to 700 bar. The sensor
has a very low response time (50 ms) and a high stability
of reading with ageing. The drift of reading (sensor plus
associated electronics) is less than 0.0003° C per year.

Type: Pt100@0°C
Measurement range: -5..+105 °C
Maximum pressure: 700 bar
Sensor body: AISI 316L
Life: unlimited
Calibration frequency: yearly
Compensation: none.
Maintenance: none.

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OS307 OEM Modules Operator’s Manual 8

4. COMBINED PRESSURE AND TEMPERATURE MODULE

The combined module contains two high-accuracy
preamplifiers associated with two 24-bit delta sigma analogue
to digital converters interfacing a Pt-100 and pressure
transducer. Both preamplifiers do not contain any electronic
adjustment (trimpot) and use high-stability VISHAY resistors,

0.05% 1ppm as reference. The OEM module firmware
automatically compensates for any thermal drift of the
module electronics and calculates the temperature in °C and
the pressure in dbar in real time. Three different ranges and
accuracies are foreseen by the temperature preamplifier;
however, the standard module is calibrated for the first
measuring range only. Calibration in the range +40..+105 must
be expressly requested. Pressure transducers having different
full-scale values are available and can be interfaced by the OEM module (see the below
pressure sensor specifications).

Measurement specifications

Parameter Range Accuracy Resolution
Pressure 0..1000*dbar ± 0.05 % F.S. 0.002 % F.S.
Temperature -5..+ 40 °C ± 0.003 °C 0.001 °C

+40..+105 °C ± 0.030 °C 0.001 °C

 other standard pressure transducers immediately available have: 10, 40, 100, 200, 500, 2000, 4000, 6000,

10000 dbar ranges.

4.1. ELECTRONIC SPECIFICATIONS

Real-time data output rate: 4 Hz.

Interface: RS485.

A/D Converter: 2x 24-bit DS.

Communication protocol: SSP (Simple Sensor Protocol).

Power supply:
Voltage: 3.0..14 VDC +/- 10%, nominal 3.6 VDC.
Run: 30 mA.

Operating temperature: -1..+70 °C.

4.2. PHYSICAL CHARACERISTICS

Dimensions (LxWxH): 50x35x30 mm.

Holding: 2 x 3mm insulated holes.

Weight: 0.045 kg.

Connector: 10x2-pin female SAMTEC CLT-110-02-G-D-A,

mating connector male SAMTEC TMMH-110-04­G-DV-A.

(1)

PCB Material: glass reinforced fibre, thickness 1.6 mm and 4

layers with solder resist and silkscreen.

(1) A wiring ending with an 8-pin AMP MODU-II connector is provided instead. The AMP MODU-II

mating connector and contact are provided.

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OS307 OEM Modules Operator’s Manual 9

4.3. PRESSURE SENSOR

The pressure sensor is a high-quality strain gauge, centrally mounted on the probe
base, capable of generating a linear signal output, thus giving a resolution of 0.03%
over the whole measuring range of 0 - 10000 dbar.

Type: strain gauge
Response time: 50 ms @1 m/s
Measurement bridge resistance: @ 25°C Ω 3500 ± 20%
Excitation current: 0.6 mA
Insulation: @ 50 VCC MΩ 100
Operating temperature: °C -30…100
Sensor body: AISI 316 L
Compensation: automatic compensation for temperature

variations; not compensated for the barometric

pressure variations.
Life: unlimited.
Calibration frequency: monthly.
Maintenance: offset calibration in air.

4.4. THE TEMPERATURE SENSOR

The temperature sensor is a platinum resistance thermometer (type Pt 100 ohms at 0o
C), fitted on a thin stainless steel housing, able to withstand up to 700 bar. The sensor
has a very low response time (50 ms) and a high stability of reading with ageing. The
drift of reading (sensor plus associated electronics) is less than 0.0003° C per year.

Type: Pt100@0°C
Measurement range: -5..+105 °C
Maximum pressure: 700 bar
Sensor body: AISI 316L
Life: unlimited
Calibration frequency: yearly
Compensation: none.
Maintenance: none.

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OS307 OEM Modules Operator’s Manual 10

5. HIGH PRECISION PRESSURE MODULE

The pressure transducers cover all pressure ranges
from 100 mbar to 1000 bar. A high-sensitivity piezo­resistive silicon chip is used for pressure sensing. The
chip is protected against ambient influences by a
stainless steel housing sealed with a concentrically
corrugated diaphragm. The housing is filled with
silicone oil so as to ensure the transfer of the pressure
from the diaphragm to the sensing component. All
metal parts in contact with the pressure media are made of stainless steel AISI316L.
The fully welded housing is vacuum-tight. Each pressure transducer is subject to
comprehensive tests as to its pressure response and temperature characteristic, and is
delivered with an individual calibration certificate stating the characteristics as well as
the results of all tests that were performed.

Measurement specification

Parameter Range Accuracy Resolution
Pressure 0..1000* bar ± 0.01 % F.S. 0.001 % F.S.

*for the available ranges, please see below.

5.1. TECHNICAL SPECIFICATIONS

Standard Pressure Ranges (FS) and Overpressure in Bar
Available ranges: 0.8…1.2 3 10 30 100 300 1000
Overpressure: 2 5 20 60 200 400 1000
Output : RS 485
Supply (V): 8…28 Vcc
Accuracy, Error Band (-10…80 °C): 0.1 % FS
Precision (10…40 °C): 0.01 % FS ranges ³ 10 bar
Output Rate: 400 Hz
Resolution: 0.002 %FS
Long-term Stability typ.: Gauges: 1 mbar or 0.05 %FS
Absolute: 0.5 mbar or 0.025 %FS (10…40 °C)
Load Resistance (ohm): <(U-7V) / 0.02A (2-wire) > 5’000 (3-wire)
Insulation : 100 Mohm / 50 V
Storage/Operating T. range: -40…120 °C
Pressure Endurance: 10 Million Pressure Cycles 0…100 %FS at 25 °C
Vibration Endurance: 20 g (5...2000 Hz, max. amplitude ± 3 mm),

according to IEC 68 2-6
Shock Endurance: 20 g (11 ms)
Material in Contact with Media: HASTELLOY.
Weight: 30 g;
Dead Volume Change: < 0.1 mm3
Connector & wiring: Molex Milli-Grid 2 mm.

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OS307 OEM Modules Operator’s Manual 11

5.2. ACCURACY AND PRECISION

“Accuracy” is an absolute term, “Precision” a relative term. Deadweight testers are

primary standards for pressure, where the pressure is defined by the primary values
of mass, length and time. Higher-class primary standards in national laboratories
indicate the uncertainty of their pressure references with 70 to 90 ppM or close to

0.01%. Commercial deadweight testers used to calibrate the transmitters indicate an

uncertainty or accuracy of 0.025 %. Below these levels, expression “Precision” is the

ability of a pressure transmitter to be at each pressure point within 0.01 %FS relative
to these commercial standards.

5.3. POLYNOMIAL COMPENSATION

The OEM module uses a mathematical model to derive the precise pressure value (P)
from the signals measured by the pressure sensor (S) and the internal temperature
sensor (T). The microprocessor in the transmitter calculates P using the following
polynomial:

P(S,T) = A(T).S0 + B(T).S1 + C(T).S2 + D(T).S3

With the following coefficients A(T)…D(T) depending on the temperature:

A(T) = A0 . T0 + A1 . T1 + A2 . T2 + A3 . T3
B(T) = B0 . T0 + B1 . T1 + B2 . T2 + B3 . T3
C(T) = C0 . T0 + C1 . T1 + C2 . T2 + C3 . T3
D(T) = D0 . T0 + D1 . T1 + D2 . T2 + D3 . T3

The OEM module is factory-tested at various levels of pressure and temperature. The
corresponding measured values of S, together with the exact pressure and temperature
values, allow the coefficients A0...D3 to be calculated. These are written into the
EEPROM of the microprocessor. When the pressure OEM Module is interrogated, the
microprocessor measures the signals (S) and (T), calculates the coefficients according
to the temperature and produces the exact pressure value by solving the P(S,T)
equation. Calculations and conversions are performed 400 times per second.

5.4. COMMUNICATION PROTOCOL

The High-precision module is interfaced through a dedicated protocol based on
MODBUS, but incorporates optimised functions for the OEM module. The complete
description of the communication protocol is shown in a dedicated document.

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6. INSTALLATION AND START-UP

Unpacking, installation and start-up procedures are described in this section.

6.1. INSTALLATION

The OEM module and its associated sensors come complete with wiring and
connectors. The connector is marked to facilitate the sensor installation on the
electronic module. Please always connect the sensor to the electronic module before
applying power.
The module is shipped with a spare connector and contacts (see below) to build a
custom cable for the connection with an external data logger.

6.2. ITERM PROGRAM INSTALLATION

Please copy the content of the ITERM folder from the CD-ROM to your PC hard disk.
A short cut on the desktop can be created to simplify the ITERM launch. At the first
run, ITERM must be properly configured to meet the communication criteria of the
OEM module, which are: 38400 baud, 8 data bits, 1 stop bit, no parity, DIGITAL
VT100 Terminal emulation, no hand-checking.
The ITERM folder on CD-ROM contains the program and some text files which allow
the operator to easily exercise communications with the OEM module.

Note:

Please be aware that the predefined command files imply that the OEM module address is the
default value: 1.
In case the OEM module address has been modified, the files must be edited to modify the
address according to the OEM module address.

6.3. POWER SUPPLY

Do not power the module using noisy AC/DC power supply. If he OEM module is
directly connected to a personal computer, we suggest using a galvanic insulation
between the OEM module RS485 and the PC interface.

6.4. HOW TO OPERATE THE OEM MODULE

The OEM module can be operated through the ITERM software per Windows; the
communication parameters of ITERM must be set to: 38400 baud, 8 data bits, 1 stop
bit, no parity, DIGITAL VT100 Terminal emulation.
The communication with the OEM module is carried out using an RS485 interface.
Therefore, a special adapter to convert the USB or the RS232C standard PC interfaces
into RS485 is needed. Furthermore, a stabilized DC power supply regulated to
generate 5VDC must be connected to the electronic module power supply wires.

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Note
Exceeding the nominal power supply by more than 10% will cause the destruction of the
OEM module electronics. There is no protection against excessive power supply voltage.

When the power is applied, the OEM module wakes up and starts in “VERBOSE”
mode (see description at section 7.4) transmitting the start-up messages (see below).
Afterwards, the OEM module waits for the commands according to the
communication protocol rules.
The commands can be manually sent by the operator or by using the predefined
command files distributed with the ITERM program. In the latter case, the “File­>Transfer” function of ITERM must be used to send the command file to the OEM
module.

Note

We suggest running the ITERM program first, setting it up, if needed, and then applying the
power to the OEM module.

6.4.1. Verbose vs Non-Verbose

If the OEM module has been reverted to “NON-VERBOSE” mode, the only way to
return its operating mode to “VERBOSE” mode is to use the dedicated command
message present in the ITERM folder and send it using ITERM.
The operating mode is stored in the internal non-volatile configuration memory and
the chosen operating mode is kept by the OEM module across ON/OFF cycles.

Note:

Please be aware that the predefined command files imply that the OEM module address is the
default “1”. In case the OEM module address has been modified, the files must be edited to
modify the address according to the OEM module address.

6.5. OEM MODULE START-UP PROCEDURE

Once the OEM module is connected to the ITERM and wakes up, it sends the following
start-up message:

OS307 OEM Temperature/Pressure Module

SSP[1]{0612030} - Fw:1.5 Hw:0.2 Feb/2015

CMD[@1]>

Now, the OEM module is ready and waits for commands from operator.

6.6. INSTALLATION OF OEM MODULE IN AN RS485 NETWORK OF SENSORS

At first, the OEM module start-up runs in “VERBOSE” mode. In case the OEM module
is being part of a network of intelligent sensors, it is mandatory to assign it an
“unused” address and revert its operation to “NON-VERBOSE” mode!
The operating mode is kept stored in the internal configuration memory and remains
valid across ON/OFF cycles. Operating the OEM module in “VERBOSE” mode, while
connected to an RS485 sensor network, may cause communication problems to sensor

network.

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Attention

Address

Cmd.
Identification

Payload

Terminator

8bit – 1Byte

8bit – 1Byte

8bit – 1Byte

8Bit - 128Byte

8bit – 1Byte

7. OEM MODULE COMMUNICATION PROTOCOL

The Simple Sensor Protocol, formerly SSP, has been developed to allow
communications between OEM modules and a main control unit. The sensor network
is built up using the half-duplex RS485 hardware protocol. The networked units share
the Rx/Tx communications lines as foreseen by the EIA 485 standard. The SSP is a half­duplex protocol which implies that the OEM modules always operate in «slave» mode
waiting for communication from the main control unit. This means that the OEM
modules do nothing but wait while spying the network on-going communications.
Only if the command message contains the OEM module address, it answers
accordingly. The SSP protocol uses plain ASCII characters only to communicate. Two
different types of messages are foreseen by the protocol: command and answer.

The SSP communication protocol is present in the following OEM Modules:

 Conductivity
 Temperature
 Pressure and temperature combined

7.1. COMMAND MESSAGE STRUCTURE

Command messages sent by the control station have the following structure:

Attention #
Address One digit 1..9; 0 is reserved for broadcasting messages to

address all the sensors connected on the network.

Command identification Single upper case character which identifies the command

“A..Z”

Payload Optional. If the command foresees a payload, the maximum

length is 128 bytes.

Contents of the payload may be separated by a space

character.

Terminator <CR> 0x0D, 13, character used to terminate the command

messages.

i.e. #1R1<CR> Command to carry out a reading from the sensor

7.2. ANSWER MESSAGE STRUCTURE

Answer messages sent by the OEM module to the control station have the following
structure:

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Attention

Address

Acknowledge

Payload

Terminator

8bit – 1Byte

8bit – 1Byte

8bit – 1Byte

8Bit - 128Byte

8bit – 1Byte

Attention character @
Address One digit 1..9; 0 = illegal address, answer message cannot be

of “broadcast” type.

Acknowledge Single character used to acknowledge or not acknowledge the

received command. Two characters are used:

! = acknowledge;

? = not acknowledge.

The Ack/Nak message puts a parameter about the

communication status in the message payload.

Payload Optional. If the command foresees a payload, the maximum

length is 128 bytes. Contents of the payload may be separated

by a space character.

Terminator <CR> 0x0D, 13, character used to terminate the answer

messages.

i.e. @1! 000 <CR> good command received.
@1? 000 <CR> bad command or message received.

7.3. COMMUNICATION PROTOCOL COMMANDS

The complete description of the SSP commands used by the OEM modules is described
in the attached document “Simple Sensor Protocol”.

7.4. COMMUNICATION PROTOCOL MODE

The SSP communication protocol foresees two different operating modes: “VERBOSE”
and “NON-VERBOSE”.

The “NON-VERBOSE” mode is typically dedicated to the interfacing of the OEM
module from data logger or electronic devices, while the “VERBOSE” mode is a slow
human oriented interface.
The “VERBOSE” mode foresees that the OEM module transmits “Diagnostic” plain
ASCII messages not foreseen by the communication protocol, but which help the
operator to understand the OEM module behavior and running activities.
Associated with the operating mode, there are two different communication time-outs.
A fast time-out applies whenever the OEM module is running in “NON-VERBOSE”
mode and a very slow time-out whenever the OEM module is running in “VERBOSE”
mode. They are respectively: Verbose = 30s and Non-verbose = 30ms.

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8. ITERM PROGRAMME

The aim of the ITERM programme is to provide a simple and reliable tool that
IDRONAUT customers can freely use to communicate with their products, like the
OEM Module. ITERM does not need any special installation procedure.

8.1. DISTRIBUTED FILES

ITERM can be freely uploaded from the IDRONAUT web site download area in a self­extracting package, which contains the following files:

ITERM.EXE Terminal emulation and probe upgrading programme.
Iterm.rtf ITERM programme documentation (Read Only).

8.2. PROGRAMME MENUS AND FUNCTIONS

The ITERM Main Menu has the following items: File, Port, Probe, Transfer, and Help.
A short description of any menu and function follows.

File->Exit It exits from the programme closing the communication

port and any open file.

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Edit->CopySelectionToClipBoard

This function copies the selected text to the Windows operating

system clipboard buffer.

Edit->CaptureToFile This function captures the characters received and sent

through the serial port to a text file. The operator can select
the file name and folder. Invoking this function, once
ITERM is capturing, the character stops capturing and
returns to the standard operations.

Port->Set parameters This function allows the operator to set and define the

communication port parameters. Default values for the
OEM Modules are: 38400 bps, 8bit data, 1stop bit, No
parity, Hardware hand checking (CTS/RTS, DTR/DSR).

Port->Close It closes the open communication port.

Probe->Identify This function is not available on the OEM Modules.

Probe->Upgrade This function is not available on the OEM Modules.

Probe->Set Time This function is not available on the OEM Modules..

Probe->Upload data This function is not available on the OEM Modules.

Probe->Unattended cast This function is not available on the OEM Modules.

Aspect->Font This function allows the operator to decide the type of font

to use to show messages on the terminal window.

Aspect->Colour This function allows the operator to select the foreground

and background colours among a list of possible choices.

Transfer->SendTextFile This function allows the operator to transfer a text file to the

OEM module connected through the serial port.

Help->Contents It shows the help file.

Help->About It shows some notice about ITERM programme release.

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8.3. TOOLBAR

On the program toolbar, there are the short cuts to the programme functions.

Disconnects the communication port, freeing the port for other programmes or
allowing the modification of communication port parameter.

This function is not available on the OEM Modules.

This function is not available on the OEM Modules.

This function is not available on the OEM Modules.

Accesses the set-up of communication port parameter.

Captures transmissions from the connected probe and keyboard typing and

storing them in the selected text file. A red cross appears on the icon when
running. Pressing it once stops the capture and closes the text file.

8.4. START-UP SWITCHES

It is possible to customize the programme at the start-up by adding the following
switches to the programme properties:

- p x Where x represents the communication port number 1..8

- b bps Where bps represents the communication speed and can be 1200, 2400,

4800, 9600, 19200, 38400, 57600, 115200.

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PIN

Description

1

GND

2

GND

3

16bit Analogue input #6

4

16bit Analogue input #5

5

16bit Analogue input #4

6

16bit Analogue input #3

7

16bit Analogue input #2

8

16bit Analogue input #1

9

I/O pin reserved – not used by OEM modules

10

V+ 3.3 VDC

11

V+ 3.3 VDC

12

I/O pin reserved – not used by OEM modules

13

I/O pin reserved – not used by OEM modules

14

RS485 A+

15

RS485 B+

16

ON/OFF Signal

17

I/O pin reserved – not used by OEM modules

18

I/O pin reserved – not used by OEM modules

19

GND

20

GND

9. OEM307- PINOUTS

Description of the OEM307 Temperature/Pressure and Conductivity module mating
connector.

TMMH-110-04-G-DV-A

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