SMC Networks Thermo-con HEF002-A6 User manual

PRODUCT NAME
Air cooled Thermo-con (Compact type)
MODEL / Series / Product Number
HEF002-A6
Serial Communication
Manual
DOC1009224
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
HEF002-A6 i
History
Version Preface Contents Chap.1 Chap.2 Chap.3 Chap.4
1.0 Jul/7/22 Jul/7/22 Jul/7/22 Jul/7/22 Jul/7/22 Jul/7/22
Record of Changes
Version Contents Date
1.0 First edition Jul/7/22

Preface
ii HEF002-A6
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:[email protected]o.jp
Notice: The content of this manual can be revised without a previous notice.

Contents
HEF002-A6 iii
Contents
1 PREPARATION FOR COMMUNICATION ---------------------------------------- 1-1
2 OPTIONS OF COMMUNICATION METHOD ------------------------------------- 2-1
2.1 COMMUNICATION PROCEDURE -------------------------------------------------------------------------- 2-1
3 COMMUNICATION FORMAT -------------------------------------------------------- 3-1
3.1 TYPE OF MESSAGE ---------------------------------------------------------------------------------------- 3-1
3.2 CONTENT OF COMMUNICATION -------------------------------------------------------------------------- 3-1
3.3 COMPOSITION 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
4 TROUBLESHOOTING ------------------------------------------------------------------ 4-1

Preparation for Communication
HEF002-A6 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 (RS-485 or RS-232C) of Thermo-con.
･Use twist pair shield cable as communication cable.
･Connect the host and thermo-con with the cross cable for RS-232C and the straight cable for RS-485.
･Connect shielded cable of communication cable to communication connector and drop it to FG(frame
ground).
･Connection drawing for communication is shown in the Figures 1-1, Figures 1-2.
･Length of communication cable for RS-485 shall be limited to around 500[m] in total, and that for RS-
232C shall be 15[m].
･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
(DOC1003077) 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.
Figure1-2 Communication Connection (RS-232C)
Host Computer
RS-232C
Symbol
FG
RD
SD
SG
Thermo-con
RS-232C
RS
CS Short
Pin No.
Connector
shell
2
3
5
Symbol
FG
RD
SD
SG
Figure1-1 Communication Connection (RS-485)
Host Computer
RS-485
Thermo-con No.1
RS-485
Thermo-con No.2
RS-485
Thermo-con No.3
RS-485
Internal connection
Terminating
resistance
220Ω1/2W
Terminating
resistance
220Ω1/2W
Internal connection Internal connection
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
SymbolPin No.
Connector
shell
1
2
5
FG
+
-
SG
SymbolPin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Symbol
FG
+
-
SG
Thermo-con No.16
9 9 9
9 9 9

Specifications of Communication Method
HEF002-A6 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, RS-232C
Half duplex
Asynchronous
2400,4800,9600,19200, 38400 bps
ASCII
None, even number, odd number
1 bit
7 bit, 8 bit.
1 bit, 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
HEF002-A6 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 operation 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
Response
(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
Notice of receiving error and its contents
Notice of storage
: Response to “request message” that has an error.

Communication Format
3-2 HEF002-A6
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 7.
 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
HEF002-A6 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
⑨

Communication Format
3-4 HEF002-A6
3.5 Explanation of Code
① STX
The code necessary for the receiver to detect the beginning of a message. It is put
at the beginning of sent characters.
② Address
The address to which (this product) the master communicates. The address in a
response message from this product shows where the message is sent.
③ Content
One of two symbols, R or W.
R: Read data from the product
W: Write or store data to the product
④ Identification
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”.
⑤ Numeric 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 deg C
Operation mode 00000: RUN
00002: STOP (RDY)
⑥ ETX
The code necessary for the receiver to know the message is complete. It is put at
the end of sent characters (except for BCC).
⑦ BCC
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”.
⑧ ACK
The affirmation code included in the “response message” of the product; it is sent
when the received “request message” contains no errors.
⑨ NAK
The negation code included in the “response message” of the product and sent with
error type information (refer to “⑩ Error type”) when the received “request
message” contains an error.

Communication Format
HEF002-A6 3-5
⑩ Error 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 HEF002-A6
3.6 Cautions for Communication
Pay attention to the following points for communication.
① Operation 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.
② Timing for sending and receiving
Allow a time delay for response to ensure the transition between sending from the
master and receiving.
③ Requesting 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.
④ Response 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.
⑤ Address 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”.
⑥ Number 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”.
⑦ Operation 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.
⑧ Storage 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
HEF002-A6 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 =25.0 deg C) at
that moment.
Request message to read (from master)
Code Symbol/Data ASCII code
① Start code STX 02H
② Address 01 30H 31H
③ Required content R (read) 52H
④ Identifier PV1 50H 56H 31H
⑤ Numeric data 00250 30H 30H 32H 35H 30H
⑥ End code ETX 03H
⑦ BCC data: Request 65H
Response 06H
⑧ Acknowledge 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 HEF002-A6
 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 20.0 deg C.
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
① Start code STX 02H
② Address 10 31H 30H
③ Required content W (write) 57H
④ Identifier SV1 53H 56H 31H
⑤ Numeric data 00200 30H 30H 32H 30H 30H
⑥ End code ETX 03H
⑦ BCC data: Request 51H
Response 06H
⑧ Acknowledge 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
HEF002-A6 3-9
3.8 Connection (RS-485)
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 to 05000
SV1 Set value (SV) Read/Write
00100 to 00600
PVS Offset setting Read/Write
-0099 to 00099
STR Data storage Write -
_MDnote) Operation mode Read/Write
00000: RUN
00002: STOP (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