Honeywell CM4 Manuel utilisateur

CM4 Serial Communication Protocol

Operating Instructions

CM4 Protocol License Agreement

Carefully review the following terms and conditions before proceeding.

In the event that you do not agree to these terms and conditions, you must

return this package intact. By not returning this package you indicate your

acceptance of all terms and conditions stipulated herein. Furthermore,

retaining it indicates and acknowledges that you have read this agreement,

understand it, and agree to its terms and conditions.

LICENSE

Honeywell Analytics grants to the user, in exchange and in consideration

for applicable fees, a license for the use of the CM4 protocol, the right to

use and the CM4 protocol denition of which is supplied to you in a

separate document. This license grants you the right of knowledge and

use of the CM4 protocol. This license does not grant ownership of the

subject. This license agreement is for site license only.

In Honeywell Analytics' granting and the user’s acceptance of this license,

this license agreement is binding. This license is granted to you, the

purchaser, and you may not sublicense, transfer or assign this license.

You may not transfer, copy or divulge any part of this protocol technique or

knowledge except as expressly provided for in this agreement.

Honeywell Analytics considers the CM4 protocol proprietary to itself.

TERM

This agreement shall be in effect until terminated. Either party may

terminate this agreement through written notication. All materials relating

to this agreement shall be returned to Honeywell Analytics upon the

termination of this agreement.

WARRANTS

Honeywell Analytics warrants this package to the extent as is set forth in

the CM4 protocol document and any other supplied documentation.

Honeywell Analytics disclaims all warranties not explicitly stated within

this agreement. Honeywell Analytics does not warrant the operation will

be uninterruptible or error-free. Furthermore, Honeywell Analytics does

not guarantee the CM4 protocol will meet your requirements. The use and

results the USER obtains are the responsibility of the USER.

In no event will Honeywell Analytics or its suppliers or vendors be liable to

you or any other person for any damages, expenses, interruption of

business, or other damages arising out of use or the inability to use the

CM4 protocol.

NOTE:

CM4 refers to any of the CM4 instruments Honeywell Analytics has

designed and markets, and is the trademark of the family.

Contents

Introduction 1

Overview 1

Glossary 2

Communication Port 3

Set up Procedure 4

Protocol Specics 5

Data and Packets 5

Checksum (Check Character) 6

ACK/NAK Handshake 7

Protocol Packet Definition 8

Packet Format 8

Start Code 8

Receiver Address 8

Transmitter Address 8

Length 8

Command 8

Data 8

Checksum 8

Date Format 9

Time Format 9

Date/Time Examples 9

Concentration Data Format Code 9

Generic Responses 10

ACK - 0x20 10

NAK - 0x21 10

Bad CMD - 0x66 10

Unknown CMD – 0x67 10

Protocol Command Definition 11

Status and Query Commands 11

NOP - 0x28 11

Get System Information – 0x30 11

Get Unit Status – 0x31 12

Get Idle Time - 0x32 15

Get Date & Time - 0x33 15

Get Maintenance Dates - 0x34 16

Get Point Conguration - 0x35 17

Get Alarm History - 0x36 18

Get Current Point Status - 0x37 19

Get TWA Time - 0x38 20

Get Display Cycle Time - 0x39 20

Get the Number of Gas Tables Available - 0x3A 21

Get Printer Setup - 0x3B 21

Get Gas Table Data - 0x3C 22

Get Fault History - 0x3D 23

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Get K-Factor - 0x3E 24

Get Pyrolyzer Temperatures - 0x42 25

Get Pump Limits - 0x43 25

Get Filter Life - 0x44 26

Get Floating Status - 0x45 27

Get One Alarm - 0x47 29

Configuration 30

Set K-Factor - 0x50 30

Reset Fault or Alarm - 0x51 31

Set Key-Code - 0x52 32

Lock Keyboard - 0x53 33

Set 2mA Fault Operation - 0x54 33

Start New Cycle - 0x55 34

Program Chemcassette Counter - 0x56 34

Set Printer Conguration - 0x57 35

Set Point Enable/Disable - 0x58 36

Set Point Conguration - 0x59 37

Set TWA Time - 0x5A 38

Set Display Cycle Time - 0x5B 38

Set Idle Time - 0x5C 39

Set Date Format - 0X5D 39

Set Date and Time - 0x5E 40

Set Relay State - 0x5F 41

End Point Lock On - 0x60 42

Start Point Lock On - 0x61 42

Save Current Conguration - 0x62 43

Restore Conguration - 0x63 43

Set Duty Cycle - 0x65 44

Set Filter - 0x66 45

Get Duty Cycle - 0x69 46

Operation 47

CM4 Instrument 47

Commands 47

Responses 47

Example Packets 48

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Introduction

Overview

The CM4 serial communications protocol was designed and developed

by Honeywell Analytics, and is proprietary information. This manual will

describe the setup and operation of the communication protocol.

Your CM4 four-point continuous monitor is equipped with an

optional serial remote device communication port. With this

communication port, you can monitor the CM4 system’s operation with

equipment from a remote location. It will also allow you to gather gas

concentration data for analysis or reports.

The CM4 monitor accepts commands and issues responses to any valid

command it receives. The CM4 monitor is always considered the “slave”

device, and the remote equipment is the “master” device. The remote

equipment can be a personal computer (PC), a programmable logic

controller (PLC), or other device capable of RS-232, RS-422, or RS-485

serial communications. This conguration requires a “master” device.

Therefore, one CM4 monitor will not communicate directly with another

CM4 monitor. However, one master can be used to communicate with

more than one CM4 monitor on a two-wire RS-485 bus.

The CM4 monitor supports multiple baud rates. These user selectable

rates are 1200, 2400, 4800, 9600, and 19,200. Additional port settings

are 8-bit, 1 stop bit, and no parity.

The slave is identied by an address programmed into the CM4 monitor

(selectable 1-255). If more than one CM4 monitor is used, each must

have a unique address.

The equipment (master) is always at address 0. Each CM4 monitor will

respond to a signal directed to it from the equipment. To prevent a

collision of messages, the master must avoid transmitting any

information after a packet until the slave responds. Typically this occurs

within 1000 milliseconds.

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Glossary

The following terms are used in this manual:

Byte: A byte is a collection of 8 bits (or pieces) of information used in the

communication process. A byte refers to these 8 bits as a single entity.

Each bit has a value of either 0 or 1.

Communication: The act or process of passing digital information

between two points.

Data: Information that is transferred between the equipment and the CM4

monitor. Data refers to the information contained within a packet (see

Packet). This information may be gas concentration, date, or other

information.

Equipment: This term is used to refer to the master device which is used

to communicate with the CM4 monitor(s). The equipment can be a

personal computer (PC) or other device capable of performing the digital

communications described in this protocol.

Handshake: The process of acknowledging a communication has been

received. The CM4 monitor uses ACK/NAK responses.

Hexadecimal: A type of numbering system with a base of 16. In this

numerical system, numbers 10 through 15 are represented by the letters

A through F respectively. The shortened version of the word hexadecimal

is generally "Hex," as in "Hex 42." "0x" is the notation used in this manual

for hexadecimal (e.g. 0x42).

Instrument: This term is used to refer to the CM4 four-point continuous

monitor.

Master: Another computer which communicates with slaves using the

CM4 protocol.

Packet: A block of information that is passed between the instrument and

the equipment. A packet is made from many bytes of information.

Protocol: The manner in which data is transferred and the format used

for the transfer. CM4 protocol refers to the packets of transferred data the

CM4 instrument recognizes.

Slave: The MDA Scientic CM4 gas monitor. A network may have several

slaves.

Time-Out: The maximum amount of time allowed between the time the

last byte of a packet is sent from the “master” device to the time the

“slave” device responds. The time-out period for this protocol is one

second.

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Communication

Port

Access to the CM4 protocol is through the COM port. This port is a DB-9

female connector. This port is designed for bidirectional communications

between the CM4 instrument and your equipment. Signals present at the

port conform to RS-232, RS-422, or RS-485 specications. Again, this is

based on which interface option was installed in your CM4 instrument.

The pin-out specications for each option are as follows:

RS-232 (Part Number 874270)

Pin Number Signal

2Transmit

3Receive

5Ground

RS-422 (Part Number 874326)

Pin Number Signal

2Receive +

3Receive -

4 Transmit -

5Transmit +

RS-485 (Part Number 874556)

Pin Number Signal

2 B (Transmit/Receive +)

3 A (Transmit/Receive -)

7Signal Ground

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Set up

Procedure

After the networking cabling has been connected to the slave, the

slave must be congured to communicate. Baud rate, address, and

protocol version are selectable. Conguration is performed with the

following sequence:

<PROGRAM> <1> is pressed to stop monitoring.

SELECT PROGRAM < >

The keys 3 3 1 are pressed to go to the COM port setup menu.

SET COM PORT

One of the four protocol congurations must be selected.

COM PORT DISABLED

COM PROTOCOL VER 1

COM PROTOCOL VER 2

COM PROT. LONWORKS

Protocol 1 is recommended for compatibility with existing master

computers. Protocol 2 provides superior data integrity, but requires a

change to the master. LONWORKS requires extra hardware.

The selection is made by pressing <ENTER>.

COM PORT 9600 BAUD

Baud rates of 1200, 2400, 4800, 9600, and 19200 are available. 9600

baud is recommended for most applications. The selection is made by

pressing <ENTER>.

SET INST. ADDRESS

INST. ADDRESS 001

Every slave on a network must have a unique address from 1 to 255.

If only one slave is present, this value may remain at 1. After entering

a unique number, press <ENTER>.

After these steps the COM port setup is complete. Normal operation is

restored by pressing <MONITOR>

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Protocol

Specics

The protocol has been designed for exibility and efciency. This byte-wise

protocol communicates information by transferring bytes of data back and

forth between master and slave. A group of bytes for each communication

is called a packet.

The master and slave(s) transfer information via data packets.

These packets will always contain bytes to start communication, an

address, a packet length, a command, and a checksum.

Additional optional variable-length data bytes or optional parameters

can also be sent or received. This section is a brief overview of the

protocol specics.

Data and Packets

A byte is a piece of data. It is a way to indicate information

and is composed of eight bits of information. A bit is

the smallest possible piece of information. It can only

be two possible values, 1 or 0 (True or False). A byte can

have a decimal value from 0 to 255. In hexadecimal

representation, a byte's value can range from 0x00 to 0xFF.

Hexadecimal representation will be used for the remainder of

this manual. The number may be interpreted in a manner

other than a number, for example, as a letter.

Using ASCII characters, where 0x41 is the letter A, 0x42 is

the letter B, 0x43 is C, and so on, a message can be written

as these numbers. Each number is a byte. For example, the

word "BAD" is 0x42, 0x41, 0x44.

The collection of the three bytes in our message (0x42, 0x41,

0x44) may be referred to as a packet, since these bytes are

always associated with each other.

Just as all words are not the same length (number of letters),

packets may also vary in length. One way to denote the size

of the word is to put the number of letters you have in the

word as the first number in your packet. Your data packet

containing the word (or command) "BAD" will then become

0x03, 0x42, 0x41, 0x44.

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