SMC Networks Thermo-con INR-244-831 User manual

PRODUCT NAME
Air cooled Thermo-con (Compact type)
MODEL / Series / Product Number
INR-244-831
Serial Communication
Manual
HEC-OM-Y010
Keep available whenever necessary.
This manual is copyrighted and all rights are reserved by SMC
Corporation, and may not, in whole or in part, be copied,
photocopied or translated without prior written consent of SMC.

History
INR-244-831 i
History
Version
Preface
Contents
Chap.1
Chap.2
Chap.3
Chap.4
1.0
Feb/19/21
Feb/19/21
Feb/19/21
Feb/19/21
Feb/19/21
Feb/19/21
Record of Changes
Version
Contents
Date
1.0
First edition
Feb/19/21

Preface
ii INR-244-831
Preface
Thank you very much for purchasing SMC Thermo-con.
This manual contains description for communication protocol of this product for your full benefit from this
product.
Read the operation manual carefully before use of this product, and understand the outline of the
product and safety instructions well. Instructions in the categories, “Danger”, “Warning”and “Caution”,
are important for safety and must be duly followed.
Please contact the following for any question and unclear points regarding the Thermo-con.
SMC Corporation R&D Center
Product Development Division-6
Address: 4-2-2, KINUNODAI,TSUKUBAMIRAI-CITY , IBARAKI-KEN 300-2493, JAPAN
Phone:[phone]
Fax:[phone]
E-mail:[e-mail]
Notice: The content of this manual can be revised without a previous notice.

Contents
INR-244-831 iii
Contents
1PREPARATION FOR COMMUNICATION ---------------------------------------- 1-1
2OPTIONS OF COMMUNICATION METHOD------------------------------------- 2-1
2.1 COMMUNICATION PROCEDURE -------------------------------------------------------------------------- 2-1
3COMMUNICATION FORMAT -------------------------------------------------------- 3-1
3.1 TYPE OF MESSAGE ---------------------------------------------------------------------------------------- 3-1
3.2 CONTENT OF COMMUNICATION -------------------------------------------------------------------------- 3-1
3.3COMPOSITION OF REQUIRED MESSAGE (FROM MASTER TO THE PRODUCT) --------------------- 3-2
3.4 COMPOSITION OF RESPONSE MESSAGE (FROM THE PRODUCT TO MASTER) -------------------- 3-3
3.5 EXPLANATION OF CODE----------------------------------------------------------------------------------- 3-4
3.6 CAUTIONS FOR COMMUNICATION ----------------------------------------------------------------------- 3-6
3.7 COMMUNICATION EXAMPLE ------------------------------------------------------------------------------ 3-7
3.8 CONNECTION ----------------------------------------------------------------------------------------------- 3-9
3.9 IDENTIFICATION CODE LIST ------------------------------------------------------------------------------ 3-9
3.10 ASCII CODE LIST --------------------------------------------------------------------------------------- 3-9
4TROUBLESHOOTING------------------------------------------------------------------ 4-1

Preparation for Communication
INR-244-831 1-1
1 Preparation for Communication
Make preparation for using communication facility as follows.
1) Turn off the power switch of Thermo-con. (Detach the communication connector when the power
switch of the thermo-con is turning off.)
2) Connect communication cable to communication connector of Thermo-con.
･Use twist pair shield cable as communication cable.
･Connect the host and thermo-con with the straight cable for RS-485.
･Connect shielded cable of communication cable to communication connector and drop it to FG(flame
ground).
･Connection drawing for communication is shown in the Figures 1-1.
･Length of communication cable for RS-485 shall be limited to around 500[m] in total
･If communication cable for RS-485 is longer, connect terminating resistance (220Ω,1/2w) to each +
and - terminal of the host computer and the farthest Thermo-con.
3) Turn on the power switch of Thermo-con.
4) Set the communication method (page 2-1) for all Thermo-con connected. (Refer the operation
manual (HEC-OM-Y008) how to set the communication method parameters.)
5) That’s all for preparation of communication. Then if a communication command from the host
computer is given, each Thermo-con will respond.
Figure1-1 Communication Connection

Specifications of Communication Method
INR-244-831 2-1
2 Options of Communication Method
Standards･････････････････････････････････････
Circuit type･･･････････････････････････････････
Communication type･･･････････････････････････
Communication speed･･････････････････････････
Character code････････････････････････････････
Parity･････････････････････････････････････････
Start bit･･････････････････････････････････････
Data length･･･････････････････････････････････
Stop bit･･･････････････････････････････････････
BCC check･･･････････････････････････････････
Address･･･････････････････････････････････････
RS-485
Half duplex
Asynchronous
2400,4800,9600,19200, 38400 bps
ASCII
None, even number, odd number
1 bit
7 bit or 8 bit.
1 bit or 2 bit.
Disable, Enable
1 to 99
Note: Values underlined indicate default values.
It is set to these values when delivered.
2.1 Communication Procedure
This product receives a “request message”from the master computer and sends
back a corresponding “response message”. It does not send a message firstly.
Response delay time setting Required interval
Time required for sending/receiving
Master
This product
From
master
0 to 250ms
1ms or more
Request
message
Response
message
From the
product
From
master
From the
product
Response
message
Request
message

Communication Format
INR-244-831 3-1
3 Communication Format
3.1 Type of Message
The type of message can essentially be divided into the following categories.
All codes, including STX and data (except for BCC), are expressed with ASCII code.
When the master is programmed, refer to page 3-9 "3.9 Identification Code List”
and “3.10 ASCII Code List”.
3.2 Content of Communication
The content that can be communicated is as follows:
1) Reading of measured temperature
2) Setting and reading of target temperature
3) Setting and reading of offset value
4) Storage of set value
5) Setting and reading of control mode
[Tips]
All set values input by communication function are not stored. If they need to be
stored, send a request message to store them in accordance with page 3-2 ”3.3
Composition of Required Message (from master to the product)”.
Request
message
Response
message
(From master)
(From this product)
: Response to normally received “request message”.
Request to write
Request to store
Request to read
Receipt check and data sending
Notice of writing completion
Noticeofreceivingerrorandits contents
Notice of storage
completion
: Response to “request message” that has an error.

Communication Format
3-2 INR-244-831
3.3 Composition of Required Message (from master to the product)
Refer to page 3-4 “3.5 Explanation of Code” for codes 1 to 10.
Composition of request message to read
Ｓ
Ｔ
Ｘ
□
□
Ｒ
□
□
□
Ｅ
Ｔ
Ｘ
Ｂ
Ｃ
Ｃ
① ③ ④ ⑥ ⑦
Start code
Request to read
Identification code
End code
BCC data
②
Address
Composition of request message to write
Ｓ
Ｔ
Ｘ
□
□
W
□
□
□
□
□
□
□
□
Ｅ
Ｔ
Ｘ
Ｂ
Ｃ
Ｃ
① ③ ④ ⑤ ⑥ ⑦
Start code
Request to write
Identification code
Numerical data
End code
BCC data
②
Address
Composition of request message to store
Ｓ
Ｔ
Ｘ
□
□
W
Ｓ
Ｔ
Ｒ
Ｅ
Ｔ
Ｘ
Ｂ
Ｃ
Ｃ
① ③ ④ ⑥ ⑦
Start code
Request to write
Identification code
End code
BCC data
②
Address

Communication Format
INR-244-831 3-3
3.4 Composition of Response Message (from the product to master)
Refer to page 3-4 “3.5 Explanation of Code” for codes 1 to 10.
Response message to request message to read
Ｓ
Ｔ
Ｘ
□
□
Ａ
Ｃ
Ｋ
□
□
□
□
□
□
□
□
Ｅ
Ｔ
Ｘ
Ｂ
Ｃ
Ｃ
① ⑧ ④ ⑤ ⑥ ⑦
Start code
Affirmation code
Identification code
Numerical data
End code
BCC data
②
Address
Response message to request message to write and store
Ｓ
Ｔ
Ｘ
□
□
Ａ
Ｃ
Ｋ
Ｅ
Ｔ
Ｘ
Ｂ
Ｃ
Ｃ
① ⑧ ⑥ ⑦
Start code
Affirmation code
End code
BCC data
②
Address
Response message to error
Ｓ
Ｔ
Ｘ
□
□
Ｎ
Ａ
Ｋ
□
Ｅ
Ｔ
Ｘ
Ｂ
Ｃ
Ｃ
① ⑧ ⑩ ⑥ ⑦
Start code
Affirmation code
Error type
End code
BCC data
②
Address
Negation

Communication Format
3-4 INR-244-831
3.5 Explanation of Code
①STX
The code necessary for the receiver to detect the beginning of a
message. It is put at the beginning of sent characters.
②Address
The address to which (this product) the master communicates. The
address in a response message from this product shows where the
message is sent.
③Content
One of two symbols, R or W.
R: Read data from the product
W: Write or store data to the product
④Identification
The classification symbol (identification code) of read or written data with
3 digit alphabetical ASCII codes. Refer to page 3-9 “3.9 Identification
Code List”.
⑤Numeric data
Read or written data with 5 digits regardless of its type.
Minus data: “- (symbol for minus)“ is displayed at the 1st digit
Position of decimal point: Not included in 5 digit data.
Ex) The 5 digit numeric data means
Ex.
Meaning of numerical data
Target temp., measured
temp., and offset value
00010: 1.0°C
Control mode
00000: Temperature control enable(Run)
00002: Temperature control diseble(Rdy)
⑥ETX
The code necessary for the receiver to know the message is complete. It
is put at the end of sent characters (except for BCC).
⑦BCC
Exclusive OR (EX-OR) of all characters from STX to ETX are taken in.
If BCC check is set to “no function”in the comunication setting mode of
the product, this code is not included in the “response message”.
⑧ACK
The affirmation code included in the “response message”of the
product; it is sent when the received “request message”contains no
errors.
⑨NAK

Communication Format
INR-244-831 3-5
The negation code included in the “response message”of the product
and sent with error type information (refer to “⑩Error type”) when the
received “request message”contains an error.
⑩Error type
When the “request message”received by the product contains an error,
the content of the error is included and sent subsequently to the “NAK”
of the “response message”. If there are multiple errors, then the error
that has been assigned the largest number is included and sent.
Table 3-1 Content and classification of errors
Error no.
Content of the error in a “request message”
0
Memory error or controller failure
It replies regardless of the content
of “request message”.
1
The numeric data is out of the “set range specified
individually for each setting item”.
2
There is no item with required.
3
The numeric data is given an ASCII code other
than the one for numeric data.
The position for the symbol is assigned an ASCII
code other than “0”or “-“.
4
Format error
5
BCC error
6
Overrun error
7
Framing error
8
Parity error

Communication Format
3-6 INR-244-831
3.6 Cautions for Communication
Pay attention to the following points for communication.
①Operation after the power supply is turned on
The product cannot communicate for approx. 6 sec. after the power supply is
turned on. (No communication). Allow a time delay before starting communication
after the power supply is turned on.
②Timing for sending and receiving
Allow a time delay for response to ensure the transition between sending from the
master and receiving when using RS-485.
③Requesting interval
When a “request message”is sent continuously from the master, allow an interval
of 1ms or more after receiving the “response message”from the product.
④Response requirements
The product will not send a “response message”if STX and ETX (BCC) are not
included in the “request message”. That is, if the “request message”contains an
error, the “response message (to the error)”, including NAK and ERR, is not sent.
If the “response message”is not returned for a significant period after the “request
message”is sent from the master, check the message and resend the necessary
“request message.
⑤Address designation error
When this error occurs, the product does not respond to a “request message”
which specifies an address other than the set one. If the “response message”is
not returned after a significant period, check the message and resend the
necessary “request message”.
⑥Number of data digits and position of decimal point
Read or written data is expressed with 5 digits, regardless of its type. Refer to
page 3-4 “3.5 Explanation of Code⑤”.
⑦Operation after “request message to store”is received
The product begins to store data after receiving a “request message to store”
from the master. Only the data that has a different content from the EEPROM
(data that has been changed) is stored. The time required for storage is approx. 6
sec. The product responds (sends an ACK) after the data storage is completed.
If the power supply is turned off during the storing process, the data might not be
stored. Do not turn off the power supply before the storage completion message is
received.
⑧Storage of data other than the “request message to store”
When a parameter is changed with a key-in operation, the product stores all
parameters into the EEPROM even if not receiving a ”request message to store”.

Communication Format
INR-244-831 3-7
3.7 Communication Example
Communication example of request message to read
Request message from master: Request the product having a set address of 1 to read the measured
temperature at that moment.
Response message from the product: Send the measured temperature (00250 =25.0oC) at that moment.
Request message to read (from master)
Code
Symbol/Data
ASCII code
①Start code
STX
02H
②Address
01
30H 31H
③Required content
R (read)
52H
④Identifier
PV1
50H 56H 31H
⑤Numeric data
00250
30H 30H 32H 35H 30H
⑥End code
ETX
03H
⑦BCC data: Request
65H
Response
06H
⑧Acknowledge code
ACK
06H
Response message from the product
02 30 31 52 50 56 31 03 65
① ③ ④ ⑥ ⑦
Start code
Request to read
Identification code
End code
BCC data
②
Address
02 30 31 06 50 56 31 30 30 32 35 30 03 06
① ⑧ ④ ⑤ ⑥ ⑦
Start code
Affirmation code
Identification code
Numerical data
End code
BCC data
②
Address

Communication Format
3-8 INR-244-831
Communication example of request message to write
Request message from master: Request the address having a set address of 10 to set the target
temperature to 20.0oC.
Response message from the product: Notice it received the request message properly.
☆Confirm whether or not data is written correctly by reading the data
separately.
Request message to write (from master)
Code
Symbol/Data
ASCII code
①Start code
STX
02H
②Address
10
31H 30H
③Required content
W (write)
57H
④Identifier
SV1
53H 56H 31H
⑤Numeric data
00200
30H 30H 32H 30H 30H
⑥End code
ETX
03H
⑦BCC data: Request
51H
Response
06H
⑧Acknowledge code
ACK
06H
Response message from the product
02 31 30 57 53 56 31 30 30 32 30 30 03 51
① ③ ④ ⑤ ⑥ ⑦
Start code
Request to write
Identification code
Numerical data
End code
BCC data
②
Address
02 31 30 06 03 06
① ⑧ ⑥ ⑦
Start code
Affirmation code
End code
BCC data
②
Address

Communication Format
INR-244-831 3-9
3.8 Connection
A terminal resistance needs to be mounted on the master and slave that are placed
the furthest from each other. The resistance must be suitable for the characteristic
impedance of the cables used for connection and have a combined resistance of 75
ohms or more.
3.9 Identification Code List
The following parameters can be changed.
Table 3-2 List of identifiers (codes)
Identifier
Description
R/W
Numerical data
PV1
Measured value (PV)
Read
-1999 –05000
SV1
Set value (SV)
Read/Write
00100 –00600
PVS
Offset setting
Read/Write
-0099 –00099
STR
Data storage
Write
-
_MDnote)
Control mode
Read/Write
00000: Temperature control enable(Run)
00002: Temperature control diseble(Rdy)
Note) “_” means 20H (space).
3.10 ASCII Code List
Table 3-3 ASCII code
ASCII code
02H
03H
06H
15H
Code used
STX
ETX
ACK
NAK
ASCII code
30H
31H
32H
33H
34H
35H
36H
37H
38H
39H
Number used
0
1
2
3
4
5
6
7
8
9
ASCII code
2DH
20H
Number used
-
Minus
SP
Space
ASCII code
41H
42H
43H
44H
45H
46H
47H
48H
49H
4AH
Character
used
A
B
C
D
E
F
G
H
I
J
ASCII code
4BH
4CH
4DH
4EH
4FH
50H
51H
52H
53H
54H
Character
used
K
L
M
N
O
P
Q
R
S
T
ASCII code
55H
56H
57H
58H
59H
5AH
Character
used
U
V
W
X
Y
Z