ABB AnalyzeIT ZMT Series Operating instructions

AnalyzeIT
Zirconia Oxygen Analyzer Systems
ZMT Series
Supplementary Operating Instructions –
Serial Data Communications
IM/ZMT–SER_2

ABB
The Company
We are an established world force in the design and manufacture of instrumentation for
industrial process control, flow measurement, gas and liquid analysis and environmental
applications.
As a part of ABB, a world leader in process automation technology, we offer customers
application expertise, service and support worldwide.
We are committed to teamwork, high quality manufacturing, advanced technology and
unrivalled service and support.
The quality, accuracy and performance of the Company’s products result from over 100 years
experience, combined with a continuous program of innovative design and development to
incorporate the latest technology.
The UKAS Calibration Laboratory No. 0255 is just one of the ten flow calibration plants
operated by the Company and is indicative of our dedication to quality and accuracy.
Health and Safety
To ensure that our products are safe and without risk to health, the following points must be noted:
1. The relevant sections of these instructions must be read carefully before proceeding.
2. Warning labels on containers and packages must be observed.
3. Installation, operation, maintenance and servicing must only be carried out by suitably trained personnel and in accordance with the
information given.
4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when operating in conditions of high pressure
and/or temperature.
5. Chemicalsmustbestoredawayfromheat,protectedfromtemperatureextremesandpowderskeptdry.Normalsafehandlingprocedures
must be used.
6. When disposing of chemicals ensure that no two chemicals are mixed.
Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets (where applicable) may be
obtained from the Company address on the back cover, together with servicing and spares information.
EN ISO 9001:2000
Cert. No. Q 05907
R
E
G
I
S
T
E
R
E
D
EN 29001 (ISO 9001)
Lenno, Italy – Cert. No.9/90A
0255
Stonehouse, U.K.
Warning – Refer to the manual for instructions
Caution – Risk of electric shock
Protective earth (ground) terminal
Earth (ground) terminal
Direct current supply only
Alternating current supply only
Both direct and alternating current supply
The equipment is protected
through double insulation
Electrical Safety
This instrument complies with the requirements of CEI/IEC 61010-1:2001-2 "Safety requirements for electrical equipment for
measurement, control, and laboratory use". If the instrument is used in a manner NOT specified by the Company, the protection
provided by the instrument may be impaired.
Symbols
One or more of the following symbols may appear on the instrument labelling:
Information in this manual is intended only to assist our customers in the efficient operation of our equipment.Use of this manual
for any other purpose is specifically prohibited and its contents are not to be reproduced in full or part without prior approval of the
Technical Publications Department.

1
CONTENTS
Section Page
1 INTRODUCTION ..........................................................2
2 PREPARATION ............................................................2
2.1 Company Standard Settings ..............................2
3 INSTALLATION ............................................................3
3.1 Serial Communication Adaptors
for Personal Computers .....................................3
3.1.1 Configuration ..........................................3
4 ELECTRICAL CONNECTIONS ...................................3
4.1 Serial Connections .............................................3
4.1.1 Cabling....................................................3
5 SETTING UP ................................................................4
5.1 Termination Resistors.........................................4
6 PROTOCOL..................................................................4
7 PROGRAMMING..........................................................5
7.1 Serial Interface Page..........................................5
8 COMMUNICATION.......................................................6
8.1 Communication between Master
and Slaves ..........................................................6
8.1.1 Mnemonics ...............................................6
8.2 Command Format...............................................6
8.2.1 Term Clarification for
Command Format...............................................6
8.3 Reply Format ......................................................7
8.3.1 Term Clarification for
Reply Format ......................................................7
8.4 Communication Examples..................................8
8.5 Status..................................................................8
8.6 Error Codes ........................................................9
8.7 Command Mnemonics .....................................10
8.7.1 General Mnemonics ...............................10
8.7.2 Multiple Read Mnemonics......................11
9 OPERATION...............................................................12
10 SPECIFICATION ........................................................12
APPENDICES ................................................................13
A1 The American Standard Code for
Information Interchange (ASCII) ......................13
A2 Non-volatile Memory Limitations ......................15
A3 Block Check Characters...................................15
A3.1 BCC Example.........................................15

2
The procedure is similar to that described in the Operating
Instructions (IM/ZMT)with additionsasdetailed inthissection.
2.1 Company Standard Settings
Only those parameters detailed on the customer order are
programmed at the factory. If any parameters are unsuitable
for the application they can be reprogrammed – see Section 9
of the Operating Instructions (IM/ZMT). Serial data
programming procedures are detailed in Section 7 of this
manual.
Standard parameter settings for the serial data programme
are as follows:
Instrument Identity 01
Parity None
Block Check
Character (BCC) BCC off
Transmission Rate 9600 baud.
Observe the limitations outlined in the Operating Instructions
(IM/ZMT). The maximum serial data transmission line length
for both RS422 and RS485 systems is 1200m.
The ZMT Series of oxygen analyzers is extended by the
addition of a serial data communication option which allows
addressing and reprogramming via a computer terminal or
host computer.
The RS422/485 communication standard is used with the
following logic levels:
a) for logic‘1’ (MARK condition or IDLE state) the‘A’ terminal
of the transmitter is negative (0V) with respect to the ‘B’
terminal (+5V)
b) for logic ‘0’ (SPACE condition or ACTIVE state) the ‘A’
terminal of the transmitter is positive (+5V) with respect to
the ‘B’ terminal (0V).
Note. ‘A’ terminal is Tx + or Rx + and ‘B’ terminal is
Tx – or Rx –.
Parity is used for simple error checking.The parity bit is a one-
bitcodewhich istransmittedinadditionto the ASCIIcharacter.
Itcandetectonly one error percharacter, since twoerrorsmay
cancel out. Parity is calculated by finding the sum of logic ‘1’s
in the character and either:
a) setting the parity bit to logic ‘1’ if the sum is odd, or logic ‘0’
if the sum is even, when using even parity
or
b) setting the parity bit to logic ‘0’ if the sum is odd, or logic ‘1’
if the sum is even, when using odd parity.
The block check character (BCC) is an additional form of
checking and is the arithmetic sum of all the characters in a
complete message (excluding parity bits) – see Appendix A3.
Error detection is achieved by comparison of the BCC’s of the
transmitted and received messages.
This manual must be read in conjunction with the instrument
operating instructions detailed in IM/ZMT.
1 INTRODUCTION 2 PREPARATION

3
3.1 Serial Communication
Adaptors for Personal Computers
An RS422/485 communications adaptor board is required for
serial links. It is strongly recommended that the card used has
galvanic isolation to protect the computer from lightning
damage and increase immunity from noise pick-up from
cables.
3.1.1 Configuration
The following OPTO22 boards are recommended for use with
the serial version of ZMT analyzers:
Part No. Computer Type
AC24 XT Bus IBM PC compatible
AC24 AT AT Bus IBM PC compatible
AC34 Microchannel IBM PC.
The following ‘Jumper’ selections are required on OPTO22
boards (usually supplied as the default configuration):
RX & TX install line termination jumper
Install pull-up and pull-down
jumpers
CTS & RTS disable jumper installed.
Select board address and interrupts as described in the
OPTO22 manual.
All connections, apart from those for serial data
communication, are made as shown in Figs.5.4 and 5.5 of the
Operating Instructions (IM/ZMT).
4.1 Serial Connections – Figs. 4.1 and 4.2
Thetransmittersmust beconnectedin parallelasshowninthe
schematic diagram – Fig. 4.1. The RS485 standard quotes
connection of maximum thirty two slaves (ZMT Analyzers) to
any single driver (computer terminal or host computer); the
RS422 standard quotes connection of up to ten slaves.
However, these numbers can be increased if the driver’s serial
port permits.
Make serial data connections as shown in Fig.4.2.The type of
cable used is dependent on the transmission speed and cable
length:
4.1.1 Cabling (refer also to Fig. 9.1 on page 13)
Up to 6m (all speeds) – standard screened or twisted pair
cable.
Up to 300m – twin twisted pair with overall foil screen and
an integral drain wire, e.g. Belden 9502 or equivalent
Up to 1200m – twin twisted pair with separate foil screens
and integral drain wires for each pair, e.g. Belden 9729 or
equivalent
Fig. 4.1 Schematic Diagram
3 INSTALLATION 4 ELECTRICAL CONNECTIONS
Chain of ZMT Analyzers
Connected
Termination Resistor
(on ZMT receive input)
Computer Terminal or
Host Computer Last ZMT
in Chain
Fig. 4.2 Serial Connections
123
Output Module 3
456
Tx
TB
Tx Rx
From PC
Rx 0V
Rx Rx Tx Tx 0V

4
For all aspects other than serial data transmission the
transmitter is set up as shown in the Operating Instructions
(IM/ZMT). Unless otherwise requested, the instrument is
despatched with a transmission rate of 9600 baud and
transmission line termination resistors linked-out. If these
settings are unsuitable, refer to Section 5.1.
5.1 Termination Resistors
and Baud Rate Settings – Fig. 5.1
5.1.1 Termination Resistors
For long transmission lines, termination resistors are
requiredonthe last ZMTAnalyzerin thechainand at thehost
computer/computer terminal. Under normal operating
conditions the resistors are required at the last ZMT receive
inputs only – see Fig. 4.1. The analyzer’s resistors are
selected using plug-in links – see Fig. 5.1.
Switch off the supply and gain access to the Serial Output
board in Output Module 3 – see
IM/ZMT, Section 6.2 .Set the
termination resistor links as shown in Fig. 5.1.
5.1.2 Hardware Baud Rate Setting
TosettheBaud rate totherequiredspeed, set the plug-inlink
as shown in Fig. 5.1
The protocol used is based on ANSI-X3.28-1976-2.5-A4 and
is used for master (host computer) to slave (ZMT Analyzer)
systems. This is the recommended protocol for use with
supervisory systems such as ABB Kent-Taylor PC30. The
Protocol is:
Start transmission (STX) – Command – Identification…
…End transmission (ETX) – see Figs. 8.1 to 8.6.
Transmissions of commands and processing of the
subsequent replies must be incorporated into the host
computer programme.
Fig. 5.1 Termination Resistor and Baud Rate Links
5 SETTING UP 6 PROTOCOL
IN
1
12
6
7
1
12
6
7OUT 98
161
1200
9600
4800
2400
Baud Rate Links
Termination Resistors

5
Page Header – Serial Interface
Transmission Rate
Select the transmission (baud) rate required (1200 slowest, 9600 fastest).
Note.The transmission rate selected must be the same as that selected in Section
5.1.2
Transmitter Identification
Assign the transmitter an identification number (1 to 99) – see Section 4.1. The
maximum number (99) allows transmitters to be connected to more than one
communication channel.
Block Check Character
Select ON or OFF as required – see Section A3.
Parity
Select the appropriate parity to match the computer terminal or host computer.
Return to the top of the Serial Interface Page or advance to the next page.
Fig. 7.1 Location of Serial Data Interface Page
Inst. Identity
1
SERIAL INTERFACE
–––––
Baud Rate 9600
–––––
Block Check ON
–––––
arity ODD
–––––
DIAGNOSTIC CHECKS
–––––
CLOCK SETU
–––––
Inst. Identity
1
SERIAL INTERFACE
–––––
Baud Rate 1200
–––––
2400
Block Check ON
4800
9600
–––––
OFF
arity EVEN
–––––
ODD
NONE
7 PROGRAMMING
The general programming procedure is as detailed in the Operating Instructions (IM/ZMT) but with an additional Serial Interface
page – see Fig. 7.1.
7.1 Serial Interface Page

6
8.2.1 Term Clarification for Command Format
Start – one ASCII control character (always ‘STX’) signifying
the start of transmission.
Command – one character, R, M or W – see Section 8.1.
Instrument Identification – two characters identifying the
ZMT Transmitter, 1 to 99.
Parameter – two-character mnemonic selected from
Section 8.7.
Sign – one character:
‘+’ – parameter value is positive (optional)
‘–’ – parameter value is negative.
Data – usually up to six characters (including decimal point)
used to write a new parameter value.
Limiter – one character (always ‘ETX’) signifying the end of
data transmission.
Block Check Character (BCC) – one character, the
arithmetic sum of the complete message (excluding parity
bits), transmitted by the host computer for error detection –
see Appendix A3.
8.1 Communication Between Master and Slaves
The commands from the master are coded as single
characters as follows:
R– ‘Read’ (read parameters)
M– ‘Multiple Read’ (read a selection of parameters)
W– ‘Write’ (write new parameter values).
8.1.1 Mnemonics
Each mnemonic for the ZMT Analyzer parameters comprises
two characters – see Section 8.7.
8.2 Command Format – Figs. 8.1 to 8.3
The protocol is based on ANSI-X3.28-1976-2.5-A4. Entries
are made directly from the host computer using the command
format shown in Figs. 8.1 to 8.3.
Fig. 8.3 'Write' Command Format
Fig. 8.2 'Multiple Read' Command Format
Fig. 8.1 'Read' Command Format
8 COMMUNICATION
R
Command
Instrument
Identification
(1 to 99) Mnemonic
(Section 8.6) BCC
(optional)
Limiter
STX
Start
ETX
M
Command
Instrument
Identification
(1 to 99) Mnemonic
(Section 8.6) BCC
(optional)
Limiter
STX
Start
ETX
Command
Instrument
Identification
(1 to 99)
Parameter
Mnemonic
(Section 8.6) BCC
(optional)
Limiter
W
Sign
(optional for
'Write'
command)
STX ETX
Start Data (up to 6 characters)
W

7
8.3 Reply Format – Figs 8.4 to 8.6
The ZMT Analyzer replies to the command using the reply
format shown in Figs. 8.4 to 8.6.
8.3.1 Term Clarification for Reply Format
Instrument Identification – two characters identifying the
ZMT Analyzer, 1 to 99.
Data – usually up to six characters (including decimal point)
showing the new parameter value.
Error Code – two-character mnemonic – see Section 8.6.
Reply – one ASCII control character (see Appendix A1):
‘ACK’ – command understood
‘NAK’ – command not understood
‘ETB’ – end of multiple read reply block.
Block Check Character (BCC) – one character, the
arithmetic sum of the complete message (excluding parity
bits), transmitted by the analyzer for error detection
– see Appendix A3.
Fig. 8.4 Reply Format (Command Understood)
Fig. 8.6 Reply Format (Command Not Understood)
Fig. 8.5 Multiple Read Reply Format
8 COMMUNICATION…
I
nstrument
Identification
(1 to 99)
P
arameter
Mnemonic
(Section 8.6) BCC
(optional)
Reply
ACK
Sign Data (up to 6 characters)
Instrument
Identification
(1 to 99)
Parameter
Mnemonic
(Section 8.6) BCC
(optional)
Reply
Sign Data (up to 6 characters)
ACK
ETB
ETB
Note. This reply format may be repeated several times – see Example c) overleaf
The last reply line is always:
First reply
Replies
2 to n
Last reply
(n+1)
ETB
Instrument
Identification
(1 to 99) Error Code BCC
(optional)
Reply
NAK

8
8.4 Communication Examples
The following examples show typical master-to-slave transmissions and the subsequent slave-to-master replies. For Error Code
and Parameter interpretations refer to Sections 8.6 and 8.7.
…8 COMMUNICATION
a) Command – STX R 06 O2 ETX
Reply – 06 02 20.9 ACK
06 Analyzer number 6
02 Oxygen
20.9 Oxygen value = 20.9
ACK Command understood
STX Start of text
R 'Read' command
06 Analyzer number 6
O2 Oxygen
ETX End of transmission
bCommand – STX M 06 M1 ETX
Reply – 06 02 20.9 ETB
06 CT 700 ETB
06 FT 200 ETB
06 AT 20 ETB
06 EF 98.0 ETB
06 CO 200 ETB
06 CD 10 ETB
06 SA 0 ETB
ACK
06 Analyzer number 6
02 Oxygen
20.9 Oxygen value = 20.9
ETB End of transmission block
06 Analyzer number 6
CT Cell temperature
700 Cell temperature = 700
ETB End of transmission block
06 Analyzer number 6
FT Flue temperature
200 Flue temperature = 200
ETB End of transmission block
06 Analyzer number 6
AT Air temperature
20 Air temperature = 20
ETB End of transmission block
06 Analyzer number 6
EF Efficiency
98.0 Efficiency value = 98.0
ETB End of transmission block
06 Analyzer number 6
CO Carbon Monoxide
200 Carbon Monoxide value = 200
ETB End of transmission block
06 Analyzer number 6
CD Carbon Dioxide
10 Carbon Dioxide value = 10
ETB End of transmission block
06 Analyzer number 6
SA Status
0 Status = No Alarms
ETB End of transmission block
ACK Command understood
STX Start of text
M 'Multiple Read' command
06 Analyzer number 6
M1 Multiple Read Mnemonic
ETX End of transmission
c) Command – STX W 06 DA ETX
Reply – 06 DA 01 ACK
06 Analyzer number 6
DA Carry out auto calibration
01 Auto calibration status
(01 – Yes, 00 – No)
ACK Command understood
STX Start of text
W 'Write' command
06 Analyzer number 6
DA Carry out auto calibration
ETX End of transmission
8.5 Status
The status code is assigned to any alarm conditions which may be present.
Status code Description
00 No Alarms (highest priority)
01 Cell Thermocouple reversed
02 Cell Thermocouple broken
03 Cell warming up
04 Cell stabilizing
05 Cell under temperature
06 Flue Thermocouple broken
07 Air Thermocouple broken
Status code Description
08 Cell low temperature
09 Cell high temperature
10 Flue high temperature
11 Flue low temperature
12 Oxygen 1 alarm
13 Oxygen 2 alarm
14 Auto Cal pass/fail
15 In auto cal
16 Cell at temperature (lowest priority)
8.6 Error Codes