Fuji Electric ZPA User manual

Instruction Manual
INZ-TN5A1190-E
INFRARED GAS
ANALYZER
COMMUNICATION
FUNCTIONS (MODBUS)
TYPE: ZPA
,
ZPB
,
ZPG

INZ-TN5A1190-E i
1. COMMUNICATION FUNCTIONS ............................................................................................1
1.1 General................................................................................................................................................1
2. SPECIFICATIONS .......................................................................................................................2
2.1 Communication specifications............................................................................................................2
3. CONNECTION.............................................................................................................................3
3.1 Terminal allocation .............................................................................................................................3
3.2 Wiring .................................................................................................................................................4
4. SETTING OF COMMUNICATION CONDITION .....................................................................6
4.1 Set items..............................................................................................................................................6
4.2 Setting operation .................................................................................................................................6
5. MODBUS COMMUNICATION PROTOCOL............................................................................7
5.1 General................................................................................................................................................7
5.2 Composition of message .....................................................................................................................8
5.3 Response of slave station ..................................................................................................................10
5.4 Function code....................................................................................................................................11
5.5 Calculation of error check code (CRC-16) .......................................................................................12
5.6 Transmission control procedure........................................................................................................14
6. DETAILS OF MESSAGE ..........................................................................................................16
6.1 Read-out of word data [Function code:03H] ..................................................................................16
6.2 Read-out of read only word data [Function code:04H] .....................................................................18
6.3 Write-in of word data (1 word) [Function code:06H]........................................................................20
6.4 Write-in of continuous word data [Function code:10H] .................................................................21
7. ADDRESS MAP AND DATA FORMAT .................................................................................23
7.1 Data format .......................................................................................................................................23
7.2 Address map .....................................................................................................................................25
7.3 Supplement to address map ..............................................................................................................38
8. TROUBLESHOOTING..............................................................................................................39
CONTENTS

INZ-TN5A1190-E 1
1.1 General
• This instrument provides a communication function through RS-485 interface, which allows data transmit to
or receive from the host computer and other devices.
• The communication system is comprised of a master station and slave stations. Up to 31 of slave station
(present instrument) can be connected per master station (host computer, programmable controller, graphic
display panel, etc.) through RS-485 interface.
• Because the master station can communicate with only one slave station at a time, the destination can be
identified by the "Station No" set for each slave station.
• In order that the master station and the slave station can communicate, the format of the transmit/receive data
must coincide. In this instrument, the format of the communication data is determined by the MODBUS
protocol.
[RS-232 RS-485 converter] (recommended article)
Type: KS-485 (non-isolated type)/SYSTEM SACOM Corp.
Type: SI-30FA (isolated type)/SEKISUI ELECTRONICS Co., Ltd.
[USB RS-485 converter] (recommended article)
Type: USB-485I/SYSTEM SACOM Corp.
RS-485
RS-232C or USB
Programable controller
USB RS-485
RS-232C RS-485
Converter
RS-485
Analyzer Analyzer
Fig. 1 Example of connection with host system
1. COMMUNICATION FUNCTIONS

2INZ-TN5A1190-E
2.1 Communication specifications
RS-485 interface
Item Specification
Electrical specification Based on EIA RS-485
Transmission system 2-wire, semi-duplicate
Synchronizing system Start-stop synchronous system
Connection format 1 : N
Maximum connectable units 31 units
Transmission distance 500m max. (total extension distance)
Transmission speed 38400bps
Data length 8 bits
Stop bit 1 bit
Parity None
Data format
X flow control None
Transmission code HEX value (MODBUS RTU mode)
Error detection CRC-16
Isolation Isolation from internal circuit
Functional isolation between signal line and ground
2. SPECIFICATIONS

INZ-TN5A1190-E 3
WARNING
Do not turn on the power supply until all wiring have been completed to avoid electric shock
and malfunctions.
3.1 Terminal allocation
RS-485 interface (RS-485 connector at the rear panel)
Pin No. Signal name Pin connection
1 Signal ground
2 RTxD+
3 RTxD−
Others NC
3. CONNECTION
9-pin D-Sub
(female)
51
96

4INZ-TN5A1190-E
3.2 Wiring
RS-485 interface
• Please use a shielded twist pair cable. (Recommended cable: KPEV-SB (made by The Furukawa Electric Co., Ltd.))
• The maximum cable length should be 500m. One master and up to thirty-one micro controllers (slaves) can be
connected per circuit.
• Terminate both ends of the circuit with a terminating resistance of 100Ω(1/2W or more).
• Ground the shielded cable once towards the master side.
Master
SG
Slave
+
–
+
–
Shielded twist pair cable
Terminating resistance
100 (1/2W)
RT x D
RT x D
Terminating resistance
100 (1/2W)
Analyzer
Analyzer
Analyzer
RS-485 interface
or
RS-485 side of
RS-232C to RS-485 conver ter
+
–
+
–
(USB)
• SG does not have to be connected, but it can be used as an effective countermeasure against communication errors
due to noise.

INZ-TN5A1190-E 5
• When using the micro controller in an area where the imposed noise level is expected to exceed 500V, we recommend
using a noise filter on the master side as seen in the figure below.
[Noise filter] (recommended): RSHN-2003 (made by TDK Corporation)
RS-485
Noise filter
Programmable controller
or
Personal computer
+ RS-232C to RS-485 converter
Analyzer
• If there are problems with EMC during communication, the noise level can be reduced by using a communication
cable with a ferrite core.
Ferrite core (recommended): ZCAT series (made by TDK Corporation)
MSFC series (made by Morimiya Electric Co., Ltd.)

6INZ-TN5A1190-E
In order that the master station and instrument can correctly communicate, following settings are required.
• All communication condition settings of the master station are the same as those of instruments.
• All instruments connected on a line are set to "Station Nos. (STno)" which are different from each other. (Any
"Station No." is not shared by more than one instrument.)
4.1 Set items
The parameters to be set are shown in the following table. Set them by operating the front panel keys.
Item Value at
delivery Setting range Remarks
Transmission speed 38400bps Fixed (can not be changed)
Data length 8 bits Fixed (can not be changed)
Stop bit 1 bit Fixed (can not be changed)
Parity setting None Fixed (can not be changed)
Set the same
communication
condition to the master
station and all slave
stations.
Station No. 1 0 to 31
(0:communication function stop)
Set a different value to
each station.
4.2 Setting operation
Set the station No. on the analyzer maintenance mode display (see the instruction manual).
4. SETTING OF COMMUNICATION CONDITION

INZ-TN5A1190-E 7
5.1 General
The communication system by the MODBUS protocol is that the communication is always started from the
master station and a slave station responds to the received message.
Transmission procedures is as shown below.
1）The master station sends a command message to a slave station.
2）The slave station checks that the station No. in the received message matches with the own station No.
or not.
3）If matched, the slave station executes the command and sends back the response message.
4) If mismatched, the slave station leaves the command message and wait for the next command message.
a) In case when the station No. in the received command message matches with the own slave station
No.
Command message
Response message
Slave to master
Master to slave Data on
the line
b) In case when the station No. in the received command message mismatches with the own slave
station No.
Command message
(Not respond)
Slave to master
Master to slave Data on
the line
The master station can individually communicate with any one of slave stations connected on the same line
upon setting the station No. in the command message.
5. MODBUS COMMUNICATION PROTOCOL

8INZ-TN5A1190-E
5.2 Composition of message
Command message and response message consist of 4 fields ; Station No., Function code, Data and Error
check code. And these are send in this order.
Station No. (1 byte)
Function code (1 byte)
Data (2 to 133 bytes)
Error check code (CRC-16) (2 bytes)
Fig. 5-1 Composition of message
In the following, each field is explained.
(1) Station No.
Station No. is the number specifying a slave station. Only a slave station that corresponds to a value to
which "Station No." is set on the analyzer maintenance mode display executes a command.
(2) Function code
This is a code to designate the function executed at a slave station.
For details, refer to section 5.4.
(3) Data
Data are the data required for executing function codes. The composition of data varies with function
codes. For details, refer to chapter 6.
A register number is assigned to each data in the analyzer. For reading/writing the data by
communication, designate the register number.
Note that the register number transmitted on message is expressed as its relative address.
The relative address is calculated by the following expression.
Relative address ＝





The lower 4 digits of the
Register number – 1
For example, when the resister number designated by a function code is 40003,
Relative address = (lower 4 digits of 40003) – 1
= 0002
is used on the message.

INZ-TN5A1190-E 9
(4) Error check code
This is the code to detect message errors (change in bit) in the signal transmission.
On the MODUBUS protocol (RTU mode), CRC-16 (Cycric Redundancy Check) is applied.
For CRC calculation method, refer to section 5.5.

10 INZ-TN5A1190-E
5.3 Response of slave station
(1) Response for normal command
To a relevant message, the slave station creates and sends back a response message which corresponds
to the command message. The composition of message in this case is the same as in section 5.2.
Contents of the data field depend on the function code. For details, refer to Chapter 6.
(2) Response for abnormal command
If contents of a command message have an abnormality (for example, non-actual function code is
designated) other than transmission error, the slave station does not execute that command but creates
and sends back a response message at error detection.
The composition of response message at error detection is as shown in Fig. 5-2 The value used for
function code field is function code of command message plus 80H.
Table 5-1 gives error codes.
Station No.
Function code + 80H
Error code
Error check（CRC-16）
Fig. 5-2 Response message at error detection
Table 5-1 Error code
Error code Contents Description
01H Illegal function Non-actual function code is designated.
Check for the function code.
02H Illegal data address A relative address of a resister number to which the
designated function code can not be used.
03H Illegal data value Because the designation of number is too much, the
area where resister numbers do not exist is
designated.
(3) No response
Under any of the following items, the slave station takes no action of the command message and sends
back no response.
・A station number transmitted in the command message differs from the station number specified to
the slave station.
・A error check code is not matched, or a transmission error (parity error, etc.) is detected.
・The time interval between the composition data of the message becomes longer than the time
corresponding to 24 bits. (Refer to section 5.6 Transmission control procedure)

INZ-TN5A1190-E 11
5.4 Function code
According to MODBUS protocol, register numbers are assigned by function codes.
Each function code acts on specific register number.
This correspondence is shown in Table 5-2, and the message length by function is shown in Table 5-3.
Table 5-2 Correspondence between function codes and objective address
Function code Resister No.
No. Function Object No. Contents
03HRead-out
(continuously)
Holding register 4xxxx Read-out/write-in word data
04HRead-out
(continuously)
Input register 3xxxx Read-out word data
06HWrite-in Holding register 4xxxx Read-out/write-in word data
10HWrite-in
(continuously)
Holding register 4xxxx Read-out/write-in word data
Table 5-3 Function code and message length [Unit : byte]
Command message Response message
Function
code Contents
Number of
designatable
data Minimum Maximum Minimum Maximum
03HRead-out of word data 64 words 8 8 7 133
04HRead-out of word data
(read-out only)
64 words 8 8 7 133
06HWrite-in of word data 1 word 8 8 8 8
10HWrite-in of continuous word data 64 words 11 137 8 8

12 INZ-TN5A1190-E
5.5 Calculation of error check code (CRC-16)
CRC-16 is the 2-byte (16-bits) error check code. From the top of the message (station No.) to the end of the
data field are calculated.
The slave station calculates the CRC of the received message, and does not respond if the calculated CRC is
different from the contents of the received CRC code.
The following shows the calculation procedure for CRC-16.
(a) Store FFFFHinto 16 bit register (CRC register).
(b) Subject the 1st byte (8 bits) of transmit message and CRC register contents to an exclusive logical
summation (XOR), and store the result into the CRC register.
(c) Shift the CRC register contents 1 bit to the right. Store 0 at MSB.
(d) If LSB before shifting is 0, do nothing.
If LSB before shifting is 1, subject it and A001H to XOR, and store the result into the CRC register.
(e) Repeat the steps (c) and (d) 8 times (shift by 8 bits).
(f) Execute steps (b) to (e) for the next byte of the transmit message.
Likewise, successively repeat the steps to each byte of the transmit message.
(g) The CRC code that is retained is the value of CRC register that stands when the processing has ended for
latest byte (latest data except error code) of the transmit message.
(h) As error check code of the transmit message, store this CRC value in the order of lower 8 bits and upper 8
bits.
Transmit message (ex.)
Fig. 5-3 shows the flow of the CRC-16 calculation system.
01Ｈ
06H
00H
05H
03H
E8H
99H
75H
Successively calculate data included here
to obtain CRC. In this case, CRC = 75
99H.
Attach the error check code to
message upon interchanging the
u
pp
er and lower orders.

INZ-TN5A1190-E 13
NO
NO
YES
YES
NO
YES
Start
Set 1 in I.
Set 1 in J.
Bit at right end
of CR is 1?
Shift CR to right by 1 bit, and A001Hand
exclusive logical sum (XOR) are executed
and its result is set in CR.
Shift CR to righ
t
by 1 bit.
Add 1 to J.
Add 1 to I.
End
Explanation of variables
CR:CRC error check data (2 bytes)
I:Digits of calculation characters
in command message
J:Check on the number of times
of CR calculation
(Calculation is executed in the order of
command message station No., function
code and data.)
CR calculation result shall be added to
the last command message in the order
of LOW byte and HIGH byte.
Set FFFFH(hexadecimal number) in CR.
Calculation (8 times) is
finished?
J>8
Calculation of all characters is
completed?
I>All characters
Exclusive logical sum (XOR) is executed
with CR and one character (1 byte) of #I o
f
the message, and its results is set in CR.
Fig. 5-3 Flow of CRC-16 calculation

14 INZ-TN5A1190-E
5.6 Transmission control procedure
(1) Transmission procedure of master station
The master station must proceed to a communication upon conforming to the following items.
(1-1) Before sending a command message, provide 48 bits time or more vacant status.
(1-2) For sending, the interval between bytes of a command message is below 24 bits time.
(1-3) Within 24 bits time after sending a command message, the receiving status is posted.
(1-4) Provide 48 bits time or more vacant status between the end of response message reception and
beginning of next command message sending [same as in (1-1)].
(1-5) For ensuring the safety, make a confirmation of the response message and make an arrangement
so as to provide 3 times or more retries in case of no response, error occurrence, etc.
Note) The above definition is for most unfavorable value. For ensuring the safety, it’s recommended
the program of the master to work with safety factors of 2 to 3. Concretely, it is advised to
arrange the program for 38400 bps with 5 ms or more for vacant status (1-1), and within 1 ms
for byte interval (1-2) and changeover from sending to receiving (1-3).
(2) Description
1) Detection of the message frame
The status on the line of the communication system is one of the 2 below.
(a) Vacant status (no data on line)
(b) Communication status (data is existing)
Instruments connected on the line are initially at a receiving status and monitoring the line.
When 24 bits time or more vacant status has appeared on the line, the end of preceding frame
is assumed and, within following 24 bits time, a receiving status is posted. When data
appears on the line, instruments receive it while 24 bits time or more vacant status is detected
again, and the end of that frame is assumed. I.e., data which appeared on the line from the
first 24 bits time or more vacant status to the next 24 bits time or more vacant status is
fetched as one frame.
Therefore, one frame (command message) must be sent upon confirming the following.
(1-1) 48 bits time or more vacant status precedes before the command message sending.
(1-2) Interval between bytes of 1 command message is smaller than 24 bits time.
2) Response of this instrument
After a frame detection (24 bits time or more vacant status), this instrument carries out processing
with that frame as a command message. If the command message is destined to the own station,
a response message is returned. Its processing time is 1 to 30 ms (depends on contents of
command message). After sending a command message, therefore, the master station must
observe the following.
(1-3) Receiving status is posted within 24 bits time after sending a command message.

INZ-TN5A1190-E 15
POL1 POL2
POL1 POL2POL1 response data
POL1 response data
Space time of longer than 2.5ms is needed
(longer than 5ms is recommended)
1 to 30msec
Master station →Analyzer
Master station ←Analyzer
Data on line

16 INZ-TN5A1190-E
6.1 Read-out of word data [Function code:03H]
Function code Max. word number read-out in
one message
Relative data address Resister No. Contents
03H64 words
0000H－009DH40001－40158 User setting
(1) Message composition
Command message composition (byte) Response message composition (byte)
Station No. Station No.
Function code Function code
Upper Read-out byte number Read-out word number×2
Read-out start No.
(relative address) Lower Upper
Upper
Contents of the
first word data Lower
Read-out word
number
Lowe
r



1 to 64
U
pp
e
r
Lowe
r
Contents of the
next word data Lowe
r
CRC data U
pp
e
r
Upper
Contents of the
last word data Lower
Lower
CRC data
Upper
* Arrangement of read-out word data
MSB LSB
Upper byte of contents of the first word data
Lower byte of contents of the first word data
Upper byte of contents of the next word data
Lower byte of contents of the next word data
Upper byte of contents of the last word data
Lower byte of contents of the last word data
(2) Function explanations
Word data of continuous word numbers from the read-out start No. can be read. Read-out word data
are transmitted from the slave station in the order of upper and lower bytes.
6. DETAILS OF MESSAGE
—
—
—
—

INZ-TN5A1190-E 17
(3) Message transmission (example)
The following shows an example of reading out from No. 1 station the setting Ch2 (2nd component)
range-1 zero and span calibration concentration.
Relative address of Ch2 range-1 zero calibration concentration setting: 0004HData number: 02H
Command message composition (byte) Response message composition (byte)
Station No. 01HStation No. 01H
Function code 03HFunction code 03H
Upper 00HRead-out byte number 04HRead-out start No.
(relative address) Lower 04HUpper 00H
Upper 00H
Contents of the
first word data Lower 00H
Read-out word
number Lower 02HUpper 03H
Lower 85H
Contents of the
next word data Lower E8H
CRC data Upper CAHLower FA H
CRC data Upper 8DH
* Meaning of read-out data
Ch2 range-1 zero calibration concentration setting 00 00H = 0
(contents of first word data)
Ch2 range-1 span calibration concentration setting 03 E8H = 1000
(contents of next word data)
Provided decimal point position = 1, measurement unit = 1,
Ch2 range-1 zero calibration concentration setting = 0.0 ppm
Ch2 range-1 span calibration concentration setting =100.0 ppm
Point For handling of decimal point and unit, refer to Section 7.1.

18 INZ-TN5A1190-E
6.2 Read-out of read only word data [Function code:04H]
Function
code
Max. word number read-out in
one message
Relative data address Resister No. Contents
0000H－00C1H30001－30194 Measurement value and
status
04H64 words
0425H－0469H31062－31130 Fixed setting
(1) Message composition
Command message composition (byte) Response message composition (byte)
Station No. Station No.
Function code Function code
Upper Read-out byte number Read-out word number×2
Read-out start No.
(relative address) Lower Upper
Upper
Contents of the
first word data Lower
Read-out word
number Lower Upper
Lower
Contents of the
next word data Lower
CRC data Upper
Upper
Contents of the last
word data Lower
Lower
CRC data Upper
* Arrangement of read-out word data
MSB LSB
Upper byte of contents of the first word data
Lower byte of contents of the first word data
Upper byte of contents of the next word data
Lower byte of contents of the next word data
Upper byte of contents of the last word data
Lower byte of contents of the last word data
(2) Function explanations
Word data of continuous word numbers from the read-out start No. can be read. Read-out word data
are transmitted from the slave station in the order of upper and lower bytes.
— —
— —