Honeywell HPB Manual de usuario

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HPB\HPA User Manual

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Honeywell Precision Barometer

HPB and HPA User’s Manual

RS-232 and RS-485 Output

HPB/HPA User Manual

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Table of Contents

0 USER’S MANUAL CONTENT 1

1 INTRODUCTION 2

1.1 PRODUCT OVERVIEW 2

1.2 HARDWARE DESCRIPTION 2

2 GETTING STARTED 3

2.1 OVERVIEW 3

2.2 EQUIPMENT NEEDED 3

2.3 TERMINAL PROGRAM SETTINGS 3

2.4 INITIAL TURN-ON RESPONSE 4

2.5 COMMAND FORMAT 4

2.6 STEP-BY-STEP EXAMPLES (Only for single HPB connection) 4

2.7 COMMAND FUNCTIONAL GROUPS 6

3 COMMANDS—QUICK REFERENCE 9

4 FUNCTIONAL OPERATION 12

4.1 OVERVIEW 12

4.2 WHAT IS INTEGRATION? 12

4.3 PRESSURE READING CONTROL 13

4.4 CUSTOMIZED PRESSURE RANGE 15

4.5 COMMAND ILLUSTRATIONS 16

4.6 PRESSURE READING DECIMAL POSITION 19

4.7 HPB ADDRESSING 20

5 COMMANDS 24

5.1 COMMAND FORMAT 24

5.2 INFORMATION REQUEST COMMANDS 24

5.3 ACTION DIRECTING COMMANDS 25

5.4 COMMAND REPLIES –GENERAL 25

5.5 ASCII FORMAT REPLIES 26

5.6 BINARY FORMAT REPLIES 27

5.7 COMMAND AND REPLY SEQUENCING 29

5.8 COMMAND ERRORS 30

5.9 COMMAND SUMMARY TABLE 31

5.10 COMMAND DESCRIPTIONS 33

6 ELECTRICAL CONNECTIONS 61

7 TIMING DIAGRAMS 63

8 SPECIFICATIONS 66

9 DIMENSIONS 68

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Figures

Figure 4.1—HPB Block Diagram 12

Figure 4.2—Pressure Reading Control 14

Figure 4.3—Custom Slope (X=) Options 15

Figure 4.4—Custom Offset (Z=) Options 15

Figure 4.5—Integration (I=) Command, Example 1 16

Figure 4.6—Integration (I=) Command, Example 2 16

Figure 4.7—S2 Speed Shift Command Example 17

Figure 4.8—S5 Speed Shift Command Example 17

Figure 4.9a—Deadband and Sensitivity (DS) Command Examples 18

Figure 4.9b—Deadband and Sensitivity (DS) Command Examples 18

Figure 4.10—Idle Count (IC) Command Example 18

Figure 4.11—Synchronize Integration Cycles (SI) Command Example 19

Figure 4.12—HPB RS-232 Ring Network 20

Figure 4.13—HPB RS-485 Multidrop Network 22

Figure 5.1—Single HPB Command and Reply 29

Figure 5.2—Multiple HPB Network Command and Replies 30

Figure 6.1—HPB RS-232/485 Electrical Connector Pin Assignments 61

Figure 6.2—Connection for RS-232 Operation 61

Figure 6.3—Connection for RS-485 Operation 62

Figure 7.1—Default Single Pressure Reading Timing Diagram 63

Figure 7.2—Default Continuous Pressure Reading Timing Diagram 63

Figure 7.3—Continuous Pressure (with IC = 1) Timing Diagram 63

Figure 7.4—Timing Diagram for 20 Readings Per Second 64

Figure 7.5—Timing Diagram for 50 Readings Per Second 64

Figure 7.6—Timing Diagram for 120 Readings Per Second 64

Figure 9.1—HPB Case Outline Standard 68

Figure 9.2—Electrical Connector 68

HPB/HPA User Manual

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Tables

Table 1.1—Various Digital Modes 2

Table 4.1—Decimal Place Locations for Pressure Readings 19

Table 5.1—Header Description for Binary Format Pressure Readings 27

Table 5.2—Binary Format Character Codes 27

Table 5.3—Command List 32

Table 5.4—Factory Default Command Responses 34

Table 5.5—Display Units Options 41

Table 7.1—Transmission Times at Selected Baud Rate 65

Table 7.2—Number of Bytes in Various Replies 65

Table 9.1—ASCII Conversion Table, Decimal to Hexadecimal 69

Table 9.2—RS-232 Standard Pin Connections 69

Table 9.3—Electrical Signal Levels 69

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0 USER’S MANUAL CONTENT

This user‘s manual is divided into the following sections.

Section 1 Introduction—Product overview and hardware description.

Section 2 Getting Started—Lists equipment and procedures necessary to operate the HPB and

provides a few simple command examples, which will get first-time users acquainted

with the command structure.

Section 3 Commands: Quick Reference—A brief description of each command with typical HPB

input and response examples.

Section 4 Functional Operation

Section 5 Commands—Contains a detailed description of the command structure, functional

groupings and all user commands.

Section 6 Electrical Connections—Contains wiring diagrams for various HPB electrical

connections.

Section 7 Timing Diagrams—Illustrates RS-232 serial port timing for command and reply

interaction.

Section 8 Specifications—Contains electrical and environmental specifications.

Section 9 Dimensions—Contains a case outline of the HPB

It is suggested that the first-time user read the ―Getting Started‖ section to be sure the necessary items are on hand.

Be sure to connect a source of pressure that matches the transducer range.

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1 Introduction

1.1 PRODUCT OVERVIEW

The Honeywell Precision Barometer RS-232 and Honeywell Precision Barometer RS-485* (HPB) provides high

accuracy absolute pressure readings in digital form. The first-time user will be able to use the HPB within minutes,

yet capability exists to configure the HPB for optimum performance in specific applications.

The heart of the HPB measuring system is a silicon piezoresistive sensor, which contains both pressure and

temperature-sensitive elements. Digital signals representing temperature and pressure are processed by a

microprocessor to produce fully temperature compensated and calibrated pressure readings over the entire -40 to

85°C temperature range.

Any computer having a serial port and terminal emulation software can be connected to the HPB to allow the user

to select baud rates, sample rates, readout resolution, units of pressure and other choices. RS-485 versions

require an RS-485 to RS-232 converter or and RS-485 port on the computer. User selected functions are set

through the digital interface. The selected functions may either be used temporarily, until the HPB is powered

down, or may be stored in the internal EEPROM to automatically configure the HPB each time power is applied.

The HPB receives commands and sends data from either an RS-232 port or a multidrop RS-485 port. Using the

RS-232 type HPB, up to 89 units can be connected in a ring configuration to a single serial port of a computer. The RS-485

type HPB allows up to 89 HPBs to be connected to a two-wire multidrop bus, when bus repeaters are used to

satisfy the RS-485 bus electrical requirements. Group (multicast) addressing allows up to nine groups of HPBs to

be addressed with a single command. Global (broadcast) addressing will send a command to all HPBs on the

serial bus.

1.2 HARDWARE DESCRIPTION

See Sections 8 and 9.

* For simplicity, references throughout this manual HPB-RS-232, HPB-RS-485, HPA-RS-232 & HPA-RS-485 have been

shortened to HPB.

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2 GETTING STARTED

2.1 OVERVIEW

The first-time user should approach the HPB in a manner analogous to using a word processor program; i.e.,

many features are available but one may begin by using those of interest at the moment. Section 2.7 of this

manual lists command features by functional groups to assist in this selection. When shipped from the

factory, the default settings provide a pressure transducer that will be usable for many applications. Once the

user is familiar with the performance and command structure, changes may be made and stored using the

‗Store Parameters‘ (SP) command. Once stored, the new default settings are activated each time the HPB is

powered up. This tailors the personality of the HPB to meet the needs of a particular application.

2.2 EQUIPMENT NEEDED

To prepare the HPB for operation, four items are needed:

• A mating connector with proper wiring connections (see connector part number and wiring diagram in

Section 6—Electrical Connections);

• A DC power supply;

• A source of pressure that is properly matched to the range of the HPB.

• A computer, or host processor, having an RS-232 or RS-485 serial port and terminal program software

such as HYPERTERMINAL . These programs are normally used to interface to a modem. The wiring diagram

designates which HPB pins must connect to the computer ―send‖, ―receive‖ and ―common‖ pins for proper

communications. Some computers may not have an RS-232 or RS-485 serial port connection identical to the

one shown in Section 6, making it necessary to adapt the HPB connections to that particular computer. A link

to Honeywell demonstration software is available at www.pressuresensing.com.

2.3 TERMINAL PROGRAM SETTINGS

• Enter the following settings in the terminal program:

Baud Rate ..... 9600

Start Bits ..... 1

Data Bits ..... 8

Stop Bits ..... 1

Parity ..... None

• Attach a line feed to the carriage return.

• Turn the local echo ON.

When shipped from the factory, the HPB is set to a baud rate of 9600, 1 start bit, 8 data bits with no parity

and one stop bit. If the baud rate has been subsequently changed, and is unknown, it will be necessary to

search all baud rate values to reestablish communication. See the BP command description in Section 5.10

of this manual for possible settings.

2.4 INITIAL TURN-ON RESPONSE

Once the wiring connections and terminal program settings are complete, the HPB will automatically send

the following response (or similar to) when power is applied. This reply will be generated any time power is

applied to the HPB.

Typical Reply:

?01HPB_ _ 1200mBAR RS-232

?00HPB_ _1200mBAR RS-485

The ―?01‖ or ―?00‖ indicates a default address device called a ―null address‖. This HPB has not yet been

assigned an ID number so it assumes the null address.

HPB/HPA User Manual

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2.5 COMMAND FORMAT

Any command interaction with the HPB requires electrical connection to the RS-232 or RS-485 serial

communications pins. There are two basic types of commands: action directing commands and information

requesting commands. Theses commands are described in Section 5.

Typical HPB commands have the form *ddcc = nnn <cr>

Where: *

nnn

<cr>

is the command header character

is the decimal address of the HPB

is a command (refer to Commands –Section 5 for a complete

description

of commands)

equal sign (required in some commands)

additional characters (required in some commands)

carriage return is required to end all commands

(do not type, press the ENTER/RETURN key)

2.6 STEP-BY-STEP EXAMPLES (Only for single HPB connection)

The following examples assume that the reader has followed them in order.

•READ SINGLE PRESSURE

Once the HPB is powered up and connected to a computer, enter the following command:

Type: *00P1 <cr>

Response:

?01CP=15.458 (for RS-232)

?00CP=15.458 (for RS-485)

where * indicates the start of a command

00 is the null address of the HPB (see note below)

P1 is the command to read the most current pressure

Note: The ―?‖ indicates a response from a null address HPB – one which has not been assigned a

device ID. A null address, 00, is coded into each HPB at the factory. When an RS-232 null address HPB

responds, it adds one to its address, hence, the response ‗01‘. Refer to the ID command in Appendix A

for a description of addresses and responses.

In the reply, the ―01‖ identifies the individual unit address (range 01-89). The ―CP=15.458‖ indicates a

compensated pressure of 15.458 psi. Your unit may not show this specific reading, depending on the

applied pressure it is measuring.

HPB\HPA User Manual

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•SET DEVICE ID

To give the HPB an assigned address of 01 up to 89, enter the following commands:

Type: *00WE <cr>

Type: *00ID=01 <cr>

This enables the HPB to change a parameter in RAM

This sets the null addressed HPB to device ID=01.

Note: The device ID is now used in the command input

Type: *01S= <cr> Response: #01S=00052036 (serial number test)

where:

The ―#‖ now replaces the ―?‖ in the header and indicates the HPB response

is from an address assigned unit.

* indicates the start of a command

00 is the null address of the HPB

WE is the command to enable a configuration parameter change

ID is the command to change the device address

01 is the assigned HPB address for this example

S= is the command to read the serial number

•READ PRODUCTION DATE

To read the production date, enter the following command:

Type: *01P= <cr>

Response:

#01P=11/15/02

(Actual responce depends on production date of device being used.)

•READ CONTINUOUS PRESSURE

For continuous pressure readings at the factory set default rate of 5 per second, enter the following

command:

Type: *01P2 <cr>

This enables a continuous stream of compensated pressure readings to flow

into the terminal program.

Type: $*99IN <cr> This is the best way to stop the continuous pressure reading commands.

The ‗$‘ character temporarily stops, or suspends, either the continuous

pressure or temperature readings. The *99IN command stops the

continuous pressure readings.

•CHANGE TO A NEW SAMPLE RATE

Enter the following command:

Type: *01WE <cr> This enables the HPB RAM to accept a changed parameter.

Type: *01I=M20<cr> This sets the integration time to value 20, which corresponds to an output

sample every 2 seconds.

The sample rate will change to one every 2 seconds. I= is an abbreviation for Integration time which

determines how long to accumulate pressure samples between readings. Each integration period

gathers the data for one pressure reading output (see Section 4.2 What is integration?). The range of

integration times can be set by specifying readings per second (I=R45 for 45 readings/sec) or time delay

in 100 millisecond intervals (I=M60 for 6 seconds). The factory set integration time is 5 samples per

second (I=M2).

The output data rate can also be altered by use of the idle count (IC) command or by using the reading

rate (RR) command in conjunction with the operating mode (OP) command. See Section 4 for

description of these commands.

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