Delta OHM HD9408.3B Manual de usuario

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Operating manual

Barometric transmitter

HD9408.3B

www.deltaohm.com

Companies / Brands of

GHM

English

Keep for future reference.

HD9408.3B - 2 - V1.2

TABLE OF CONTENTS

1INTRODUCTION.................................................................................................... 3

2DESCRIPTION....................................................................................................... 4

3INSTALLATION ..................................................................................................... 5

3.1ELECTRICAL CONNECTIONS OF THE MODELS HD9408.3B.1 AND HD9408.3B.2 ..................... 5

3.1.1RS485 CONNECTION ................................................................................ 5

3.1.2RS422 CONNECTION ................................................................................ 6

3.1.3RS232 CONNECTION ................................................................................ 7

3.1.4CONNECTION OF THE ANALOG OUTPUT ............................................................ 7

3.2ELECTRICAL CONNECTIONS OF THE MODEL HD9408.3B.3 ................................................ 8

3.2.1SDI-12 CONNECTION ............................................................................... 8

4CONFIGURATION.................................................................................................. 9

4.1CHOOSING THE DIGITAL OUTPUT TYPE IN HD9408.3B.1 AND HD9408.3B.2 MODELS .................. 9

4.2CHOOSING THE PROTOCOL IN HD9408.3B.1 AND HD9408.3B.2 MODELS ........................... 9

4.3SELECTING THE UNIT OF MEASUREMENT .................................................................... 10

4.4CONFIGURING THE ANALOG OUTPUT ......................................................................... 10

4.5SERIAL COMMANDS OF DELTA OHM PROTOCOL FOR HD9408.3B.1 AND HD9408.3B.2 ............. 11

4.6SERIAL COMMANDS OF DELTA OHM PROTOCOL FOR HD9408.3B.3................................... 14

5MODBUS-RTU PROTOCOL.................................................................................... 17

5.1MEASUREMENTS READING ..................................................................................... 17

5.2SETTING THE MODBUS PARAMETERS ....................................................................... 17

5.3CONFIGURATION REGISTER.................................................................................... 19

5.4ERROR REGISTER ............................................................................................... 19

6NMEA PROTOCOL ................................................................................................ 20

7SDI-12 PROTOCOL .............................................................................................. 21

8TECHNICAL SPECIFICATIONS ............................................................................. 26

9INSTRUMENT STORAGE ...................................................................................... 28

10SAFETY INSTRUCTIONS...................................................................................... 28

11ORDERING CODES .............................................................................................. 29

HD9408.3B - 3 - V1.2

1INTRODUCTION

HD9408.3B is a barometric transmitter that uses a piezoresistive high accuracy and

temperature-compensated sensor. It allows measuring the atmospheric pressure in

the range 0…1350 hPa (digital outputs) or 500...1200 hPa (analog outputs), providing

extreme accuracy and time stability, with excellent repeatability, low hysteresis, and

excellent temperature behavior.

The superior performances are obtained thanks to the employment of a piezoresistive Sil-

icon sensor that integrates both a pressure sensitive as well as a temperature sensitive

element. The measurement of pressure and temperature are processed by a microproc-

essor to obtain an output signal that is compensated over the transmitter’s whole, wide

temperature operating range: -40…+85°C.

The sensor is factory calibrated at several points at different temperatures in the

range of use.

The transmitter is available in three versions which differ in the output type:

•HD9408.3B.1: configurable 0…5 V or 1…5 V analogue voltage output and digi-

tal RS232, RS422 or RS485 output. Standard MODBUS-RTU and NMEA 0183

protocols.

•HD9408.3B.2: active configurable 0…20 mA or 4…20 mA current output and

digital RS232, RS422 or RS485 output. Standard MODBUS-RTU and NMEA 0183

protocols.

•HD9408.3B.3: digital SDI-12 output, compatible with version 1.3 of the proto-

col.

The digital output enables the transmission of the measurements over long distances

and connects the transmitter to sensor networks.

The pressure measured and transmitted with MODBUS RTU and SDI-12 protocols can

be expressed in different user-selectable measuring units.

The watertight housing with IP 67 protection degree allows the use of the instrument

even in harsh environments.

The instrument is particularly suitable for meteorological applications (AWOS - Auto-

mated Weather Observing Systems), environmental monitoring systems, meteorologi-

cal and environmental data logging, measurement laboratories, atmospheric pressure

compensation in the performance of internal combustion engines, barometric pressure

compensation in clean rooms, vehicle emission test.

Its low power consumption makes it ideal for remote acquisition systems such as au-

tomatic weather stations powered by solar cells.

DC power supply 10…30 Vdc.

HD9408.3B - 4 - V1.2

2DESCRIPTION

1. Housing mounting holes.

2. M12 connector for power supply and outputs.

3. Barometric pressure input.

HD9408.3B - 5 - V1.2

3INSTALLATION

The sensor and electronics are housed in a sturdy metal housing with IP 67 degree of

protection. The transmitter can be mounted in any position, but typically is attached

to a vertical wall with the outlet pressure facing downward. The two holes on the

housing’s sides allow you to secure the base of the transmitter directly to a panel or a

wall. See the chapter “TECHNICAL SPECIFICATIONS” for the dimensions of the mounting

holes.

3.1 ELECTRICAL CONNECTIONS OF THE MODELS HD9408.3B.1 AND HD9408.3B.2

The transmitters HD9408.3B.1 and HD9408.3B.2 have an 8-pole M12 male connector.

On request, CP18… cables with 8-pole M12 female connector and 2 or 5 m

standard length are available (other lengths on request).

Fig. 3.1.1: cable CP18…

TAB. 3.1.1: connections of HD9408.3B.1 and HD9408.3B.2

Function

Connector

numbering Symbol Description

12-pole cable

numbering

1 PWR- Power Negative / serial grounding 12

2 PWR+ Power Positive 1

3 RX- Rx- for RS422 3

4 TX- Tx for RS232/ Tx- for RS422 / DATA- for RS485 9

5 TX+ Tx+ for RS422 / DATA+ for RS485 5

6 RX+ Rx for RS232/ Rx+ for RS422 8

7 AGND Analog output Negative 10

8 AOUT Analog output Positive 11

3.1.1 RS485 CONNECTION

The RS485 connection of the transmitter is made over a screened twisted-pair cable for

the signals and a third grounding wire.

At the beginning and at the end of each segment you should apply the line terminator.

The maximum number of devices that can be connected to the (Bus) line 485 depends

on the load characteristics of the devices to be connected. The RS485 standard requires

that the total load does not exceed 32 unit loads. The load of a transmitter is equal to 1

unit load. If the total load is greater than 32 unit loads, divide the network into segments

and then put a signal repeater between a segment and the next. At the beginning and

end of each segment of the line, terminations should be applied. The RS485 output of the

transmitter is not isolated.

Male M12 connecto

of the transmitter

Numberin

the

cable wires

Cable CP18….

HD9408.3B - 6 - V1.2

Fig. 3.1.2: RS485 output connection

The cable maximum length depends on baud rate and cable characteristics. Typically,

the maximum length is 1200m. The data line must be kept separated from any power

lines in order to prevent interferences on the transmitted signal.

Each transmitter placed on the network is univocally identified by an address. Trans-

mitters having the same address shall not be present in the network.

NMEA, MODBUS-RTU and Delta OHM proprietary protocols can be used with RS485

connection. Before connecting the instrument to the network, configure address and

Baud Rate (see paragraph 4.5).

3.1.2 RS422 CONNECTION

The RS422 standard is used for the point-to-point connection over long distances. The

instrument is connected to the PC by means of a screened cable with two twisted-pair

cables for the signals and an additional wire for grounding. It is necessary to provide

for line terminations at the ends of the connections.

Fig. 3.1.3: RS422 connection

Shield

Power su

10…30 Vdc

CP18…cable

PLC, datalo

er o

converter RS485/USB

or RS485/RS232 for PC

Other sensors with

RS485 output

Termination

ermination

Termination

ermination

Power su

10…30 Vdc

PLC, datalo

er o

converter RS422/USB

or RS422/RS232 for PC

Shield

CP18…cable

HD9408.3B - 7 - V1.2

The cable maximum length depends on baud rate and cable characteristics. Typically,

the maximum length is 1200m. The data line must be kept separated from any power

lines in order to prevent interferences on the transmitted signal.

NMEA, MODBUS-RTU and Delta OHM proprietary protocols can be used with RS422

connection. Before connecting the instrument to the network, configure address and

Baud Rate (see paragraph 4.5).

3.1.3 RS232 CONNECTION

The length of RS232 cables should not exceed 15 m. If the PC is not fitted with RS232

serial ports, it is possible to interpose the adapter cable RS52 (optional) between in-

strument and PC, which has an integrated USB/RS232 converter.

Fig. 3.1.4: connection of RS232 output

NMEA and Delta OHM proprietary protocols can be used with RS232 connection.

3.1.4 CONNECTION OF THE ANALOG OUTPUT

Fig. 3.1.5: connection of the active 0…20/4…20 mA analog output

In case of analog current output, the maximum shunt resistance Rs of the receiver

depends on the power supply: Rs ≤100 Ω@ 12V, Rs ≤700 Ω@ 24V.

Fig. 3.1.6: connection of analog 0…5/1…5 V voltage output

Power su

10…30 Vdc

RS232 serial

ort

CP18…cable

Shield

Instrument with current in

CP18…cable

Shield

10…30 Vdc

ower su

Instrument with volta

e in

CP18…cable

Shield

10…30 Vdc

ower su

HD9408.3B - 8 - V1.2

In case of analog voltage output, the input resistance Rin of the receiver should be at

least 100 kΩ.

3.2 ELECTRICAL CONNECTIONS OF THE MODEL HD9408.3B.3

The transmitter HD9408.3B.3 has a 4-pole M12 male connector. On request,

CPM12AA4… cables with flying 4-pole M12 connector with 2 or 5 m standard

length are available (other lengths on request).

Fig. 3.2.1: CPM12AA4… cable

TAB. 3.2.1: connections of HD9408.3B.3

Function

Connector

numbering Symbol Description Color

1 PWR- Power Negative / serial grounding Blue

2 PWR+ Power Positive Red

3 Screen Black

4 SDI SDI-12 data line White

3.2.1 SDI-12 CONNECTION

More SDI-12 sensors can be connected in parallel. The distance between a sensor and

the acquisition system should not exceed 60 m. Before connecting the instrument to

an SDI-12 network containing other sensors, set the address by using the proper SDI-

12 command (see chapter 7).

Fig. 3.2.2: SDI-12 connection

M12 male connecto

of the transmitter

Blue

(

)

CPM12AA4… cable

Red

(

)

Black

(

)

White

(

)

10…30 Vdc

ower su

CPM12AA4… cable

Other SDI-12 senso

Datalo

er in

Other SDI-12 senso

HD9408.3B - 9 - V1.2

4CONFIGURATION

When powered, the transmitter always starts to operate with the set operating proto-

col. The models HD9408.3B.1 and HD9408.3B.2 are factory set with MODBUS-RTU

protocol, RS485 physical interface, Baud Rate 19200 and communication parameters

8E1. To change the settings of the transmitter, see the next paragraphs.

4.1 CHOOSING THE DIGITAL OUTPUT TYPE IN HD9408.3B.1 AND HD9408.3B.2 MODELS

The models HD9408.3B.1 and HD9408.3B.2 allow selecting the type of digital output

(RS232, RS422 or RS485) on hardware level, by means of dip switches on the elec-

tronic board, or at software level, by means of an appropriate serial command. By de-

fault, the RS485 output via the dip switches is set. To access the dip switches, unscrew

the screws fixing the housing cover, remove the cover and set the dip switches as

shown in figure 4.1.1.

Fig. 4.1.1: selecting the digital output by means of the dip switches

The setting via the dip switches has priority over the setting via serial command. By

selecting the option "SW set", the transmitter uses the digital output set at software

level with the serial command CPI described in paragraph 4.5.

4.2 CHOOSING THE PROTOCOL IN HD9408.3B.1 AND HD9408.3B.2 MODELS

In the models HD9408.3B.1 and HD9408.3B.2, NMEA 0183 and MODBUS-RTU stan-

dard protocols and Delta OHM proprietary protocol are available. The selection of the

protocol is done via the serial command CPI described in paragraph 4.5. If the trans-

mitter digital output is set by means of the dip switches, the choice of the protocol

must be compatible with the selected physical interface, as reported in table 4.2.1. By

default, the MODBUS-RTU protocol with RS485 physical interface is set.

HD9408.3B - 10 - V1.2

TAB. 4.2.1: compatibility of physical interface/protocols in models HD9408.3B.1

and HD9408.3B.2

Physical Interface

RS232 RS422 RS485

Delta OHM Proprietary 999

MODBUS-RTU 99

Protocol

NMEA 0183 999

4.3 SELECTING THE UNIT OF MEASUREMENT

The pressure measured and transmitted via the digital output with MODBUS-RTU and

SDI-12 standard protocols can be expressed in a user selectable unit of measurement

among: Pa, hPa, kPa, mbar, bar, atm, psi, mmHg, inHg, mmH2O, ftH2O, kg/cm2, Torr.

The default unit is hPa. The unit setting is done with the serial command CPU described

in paragraph 4.5. Table 4.3.1 shows the resolution of the measurement as a function of

the selected unit.

TAB. 4.3.1: measuring unit and resolution with Modbus and SDI-12 protocols

Unit of measurement Resolution

Pa 1 Pa

hPa 0.01 hPa

kPa 0.001 kPa

mbar 0.01 mbar

bar 0.00001 bar

atm 0.00001 atm

psi 0.0001 psi

mmHg 0.001 mmHg

inHg 0.0001 inHg

mmH2O 0.1 mmH2O

ftH2O 0.0001 ftH2O

kg/cm20.00001 kg/cm2

Torr 0.001 Torr

With the NMEA 0183 standard protocol, the pressure value is transmitted in two fixed

units: Pa and bar. With the Delta OHM proprietary protocol, the pressure is transmit-

ted in the fixed units mbar, psi and hPa.

4.4 CONFIGURING THE ANALOG OUTPUT

The analog output in the models HD9408.3B.1 and HD9408.3B.2 is factory preset to

have the output signal corresponding to the 500…1200 hPa measuring range. The

analog output can be configured so as to have the output signal corresponding to a

different measuring range by using the serial commands CAI (sets the initial value of

the measuring interval) and CAF (sets the final value of the measuring interval).

To reverse the operation of the analog output, so that the output signal decreases as

the measured pressure increases, use the serial command CAiE. To cancel the inver-

sion and restore the output normal operation, use the serial command CAiD.

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