Crystal 5KPSIXP2I-DL, XP2i, 10KPSIXP2I-DL, 15PSIXP2I-DL, 2000PSIXP2I-DL Programming Instructions

...

Programming Instructions

For the XP2i Digital Test Gauge

Contents

Overview.................................................................1

Introduction ..............................................................1

Communication Format ....................................................2

Query Instructions .........................................................2

Commands ..............................................................5

General Commands .......................................................5

Acknowledgment of a Command ...........................................7

Support ..................................................................8

Troubleshooting the Digital Interface .......................................8

Eects of Password Protection on Commands ...............................9

Programming Tips .........................................................9

Bootloader Signature .................................................... 10

Overview

INTRODUCTION

Thank you for choosing the XP2i Digital Test Gauge from Crystal Engineering Corporation. Your XP2i is a combination of leading edge technology and rugged

industrial design.

—

Your XP2i can be congured through the use of CongXP™ software available from Crystal Engineering. Your personal computer can disable, enable, or

modify a variety of features of your XP2i. Look for the

A user dened pressure scale, and/or disable unused pressure units

•

Password protection to prevent unauthorized changes

•

Disable keypad recalibration, peak button, and/or units button

•

Expand or decrease allowable Zero range

•

Set the gauge to a dierent density of water factor (4°C, 60°F, or 68°F)

•

Store a 12 digit ID or tag number in non-volatile memory

•

Adjust calibration values

•

We hope your XP2i meets your expectations, and we’re interested in any comments or suggestions you may have.

You can send us a note at: crystal@ametek.com Many features in this and our other products are a direct result of your comments!

logo for programmable features, like:

Overview  1

he XP2i can be connected to a personal computer via RS-232, using an ordinary DB9 extension cable (male DB9 for the XP2i connection, female DB9 for the

PC side). The interface lets you record displayed readings and recorded peaks. The data string always includes the pressure units.

The XP2i can be operated remotely, as if you were pressing the buttons. You can use a simple terminal program to send the commands, or, you can incorpo-

rate them into your own software program.

I/O Settings

The serial interface settings are:

Baud Rate Data Bits Parity Stop Bits Flow Control

9600 8 None 1 None

XP2i Programming Instruction Manual

COMMUNICATION FORMAT

Input is case-sensitive; all instructions should be sent in UPPERCASE. Instructions must be terminated with a single carriage return (CR) character followed by

an optional linefeed (LF) character. Note that while the XP2i expects either CR or CR/LF as command termination on its input, it always appends a CR/LF pair to

—

its output. For reference, CR is ASCII value 13 decimal, while LF is ASCII character 10 decimal.

You have 30 seconds to complete an instruction. After 30 seconds, the XP2i will evaluate whatever it has received and try to match it to its table of commands.

If the command is incomplete, it will fail to match and the XP2i will return: N,Ø. (Negative acknowledgment with no reception errors, so syntax is wrong.)

QUERY INSTRUCTIONS

All queries start with a question mark (?). Any pressure values returned are split across two lines; the rst contains a oating-point value, and the second

contains the name of the measurement unit. Each line is right-justied in a xed width 10 character eld. (Since each line is terminated with a CR-LF pair, this

—

means the total length of the response to a measurement query is 24 bytes.) A decimal point will always be included with the pressure value (for clarity) even

if it is not displayed on the XP2i. For example, a pressure query of a 300 PSI XP2i on the mbar scale could return a reading like this:

2478. mbar

If low batteries cause the low battery message to be displayed, then any pressure query will replace the pressure value with the letters “BATT”.

Overview  2

Message Store

?MSG . . . . . . . .Retrieve the data (usually tag# or ID) from the message store.

Model

?MOD . . . . . . . .Return the model name, up to 20 characters long. For example, a 100 PSI XP2i would return the following:

100PSIXP2I

Pressure

?P,U . . . . . . . .Pressure returns the pressure value, followed by the pressure unit on the second line.

Example:

-7.89 mmH2O

XP2i Programming Instruction Manual

+ 9 hidden pages