SMC Networks THERMO-CON HEC001 Series, THERMO-CON HEC003 Series, THERMO-CON HEC012 Series, THERMO-CON HEC006 Series, THERMO-CON HEC002 Series Communications Manual

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HEC002-A

THERMO-CON

Model No.

HEC001 series
HEC003 series
HEC012 series

HEC002 series
HEC006 series

Keep available whenever necessary.

A_HEC-OM-J017

Rev.May.2010

© 2006 SMC CORPORATION All Rights Reserved

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

HEC i

History

Version

Preface

Contents

Chap.1

Chap.2

Chap.3

Chap.4

Chap.5

Chap.6

1.0

1.1

Record of Changes

Version

Contents

Date

1.0

First edition

June.2006

1.1

The series name is added to the cover.The product photography of the
cover is deleted.

May.2010

Preface

HEC

ii

Preface

Thank you very much for purchasing SMC Thermo-con.

This manual contains description for communication 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

HEC iii

CONTENTS

Pages

1 Preparation for Communication ------------------------------------------------- 1-1

2 Specifications of Communication Method ----------------------------------- 2-1

3 Communication Format ------------------------------------------------------------- 3-1

3.1 Control code used for communication -------------------------------------------------------------- 3-1

3.2 Command code list --------------------------------------------------------------------------------------- 3-1

3.3 Communication procedures and format ------------------------------------------------------------ 3-2

3.4 Calculation of checksum -------------------------------------------------------------------------------- 3-3

4 Details of Communication format ----------------------------------------------- 4-1

4.1 Temperature setting (without writing EEPROM) -------------------------------------------------- 4-1

4.2 Reading setting temperature --------------------------------------------------------------------------- 4-1

4.3 Reading internal sensor --------------------------------------------------------------------------------- 4-2

4.4 Reading external sensor -------------------------------------------------------------------------------- 4-3

4.5 Reading alarm status ------------------------------------------------------------------------------------ 4-3

4.6 Reading temperature average data ------------------------------------------------------------------ 4-5

4.7 Offset setting (without writing EEPROM) ----------------------------------------------------------- 4-5

4.8 Reading offset --------------------------------------------------------------------------------------------- 4-5

4.9 Temperature setting (with writing EEPROM) ------------------------------------------------------ 4-6

4.10 Offset setting (with writing EEPROM) --------------------------------------------------------------- 4-7

5 Troubleshooting ----------------------------------------------------------------------- 5-1

6 Communication Format and

Examples of Answers from Thermo-con -------------------------------- 6-1

Preparation for Communication

HEC 1-1

1 Preparation for Communication

Make preparation for using communication facility as follows.

1) Turn off the power switch of Thermo-con.

2) Connect communication cable to communication connector (RS-485 of 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(flame

ground).

･Connection drawing for communication is shown in the Figures 1-1 and 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) Select communication types for all Thermo-cons. See the operation manual of the details.

5) That’s all for preparation of communication. Then if a communication command from the host
computer is given, each Thermo-con will reply it.

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

Specifications of Communication Method

HEC 2-1

2 Specifications of Communication Method

・Standards･････････････････････････････････････
・Circuit type･･･････････････････････････････････
・Communication type･･･････････････････････････
・Communication speed･･････････････････････････
・Character code････････････････････････････････
・Parity･････････････････････････････････････････
・Start bit･･････････････････････････････････････
・Data length･･･････････････････････････････････
・Stop bit･･･････････････････････････････････････
・Block check･･･････････････････････････････････

RS-485 or RS-232C
Half duplex
Asynchronous
Changeable, 600,1200,2400,4800,9600,19200 bps
ASCII
Select, Nil, even number, odd number
１bit
Select 7 bit or 8 bit.
Select 1 bit or 2 bit.
Sum check

Note: Values underlined indicate default values at all reset.

It is set to these values when delivered.

Communication Format

HEC 3-1

3 Communication Format

3.1 Control code used for communication

3.2 Command code list

Command code (COM)

Contents

31H

Set temperature (without writing EEPROM) and read

32H

Read internal sensor

33H

Read external sensor

34H

Read alarm status

35H

Read temperature average data
(It is same as reading external sensor in this model.)

36H

Set offset (without writing EEPROM) and read

37H

Set temperature (with writing EEPROM)

38H

Set offset (with writing EEPROM)

Control code

ASCII code

ENQ

05H

STX

02H

ETX

03H

ACK

06H

CR

0DH

SOH

01H

・ ”H” of ASCII code indicates hexa code.

Communication Format

HEC

3-2

3.3 Communication procedures and format

The host computer has the initiative of sequence. Sequence always starts from the host computer

and each Thermo-con replies it.

If communication data is processed normally, the Thermo-con returns specified response and if

processing communication data is failed, no response is returned.

When no response is returned to the host computer from the Thermo-con even if waiting for 3 sec.,

resend the data. The Thermo-con returns response after waiting for 50 msec.

For communication of plural number of communication data, wait until the return message is
received from the thermo-con to send the next communication data. It sometimes cannot return the
messages properly when the communication data is received successively.

Selection of Unit Specification

･There are two cases in communication format, which are specifying unit No. and not.
･When one Thermo-con is used, select “without secifying unit” and when two or more

Thermo-cons are used, select “ with specifying unit”.

･When several Thermo-con are used with without specified unit No.,correct control is not

realized due to data conflict.

･In the case of use with specified unit No.,ensure to coincide communication No. and each

Thermo-con unit No.

(1) Setting Change

Host →

STX

COM

Data

ETX

Check sum

CR

10

1 100 10-1

10

-2

(H) (L)

← Thermo-con

ACK

CR

<Specifying unit>
Host →

SOH

UT

STX

COM

Data

ETX

Check sum

CR

10

1

10

0 10-1

10-2 (H) (L)

← Thermo-con

ACK

UT

CR

(2) Confirming and reading

Host →

ENQ

COM

Check sum

CR

(H) (L)

← Thermo-con

STX

COM

Data

ETX

Check sum

CR

10

1

10

0 10-1

10-2 (H) (L)

Host →

ACK

CR

(Possible to omit)

Communication Format

HEC 3-3

<Specifying unit>
Host →

SOH

UT

ENQ

COM

Check sum

CR

(H) (L)

← Thermo-con

SOH

UT

STX

COM

Data

ETX

Check sum

CR

10

1

10

0 10-1

10-2 (H) (L)

Host →

ACK

UT

CR

(Possible to omit)

･COM indicates communication command.
･UT indicates unit No. of each Thermo-con. Unit No. is the No. to identify each Thermo-cons when

2 or more Thermo-cons are linked by communication. Set this No. with second mode of Thermo­con within O-F. (UT is the code adding 30H to unit No.. 30H---3FH.)

･As for symbols at communication, minus is indicated by “-“ (2DH by ASCII code) and plus is

indicated by “0” (30H by ASCII code).

･In case of setting temperature and offset with communication, data out of set range isn’t

memorised. (If communication format is correct, ACK returns.)

･When writing in EEPROM is specified, changed data is memorized in EEPROM each time. Since

writing life of EEPROM is (approx. 1 million times), EEPROM is changed only when data is changed.

3.4 Calculation of Check Sum

Calculation range ---------------- From the second byte to ETX

when there is no ETX, add before check sum.

Calculating method---------------Take out the lower 1 byte of the total.

eg.) Set temperature to 30 deg.C (without unit specified)

STX 31H 33H 30H 30H 30H ETX 3FH 34H CR

Total F4H

eg.) Read Thermo-con internal sensor of unit No.2

SOH 32H 05H 32H 36H 39H CR
Total 69H

Note) Check sum is not ASCII code.

Data of UT and Check Sum

Character data

0…9 Ａ Ｂ Ｃ Ｄ Ｅ Ｆ

ASCII

30H…39H

41H

42H

43H

44H

45H

46H

UT and check sum

30H…39H(ditto)

3AH

3BH

3CH

3DH

3EH

3FH

Details of Communication Format

HEC 4-1

4 Details of Communication Format

4-1 Temperature setting (without writing EEPROM)

The host computer sets temperature of each Thermo-con. In this command, temperature setting data is

not written in EEPROM. This data is invalidated by turning off power.

The setting range is from 10.0 to 60.0 deg.C. As 0.1 deg.C is the minimum unit, the number in the
hundredths place (10-2) should always be 0 (=30H). (When the value at every 0.01deg.C is input, it is
rounded off.)

Host →

STX

31H

Setting data

ETX

Check sum

CR

10

1

10

0 10-1

10

-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

CR

<Specifying unit>

Host →

SOH

UT

STX

31H

Setting data

ETX

Check sum

CR

10

1

10

0 10-1

10

-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

UT

CR

4-2 Reading setting temperature

As 0.1 deg.C is the minimum unit, the number in the hundredths place (10-2) is always 0 (=30H).

Host →

ENQ

31H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

STX

31H

Setting data

ETX

Check sum

CR

10

1 100 10-1 10-2

(Ｈ) (Ｌ)

Host →

ACK

CR

(Possible to omit)

Details of Communication Format

HEC

4-2

<Specifying unit>
Host →

SOH

UT

ENQ

31H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

SOH

UT

STX

31H

Setting data

ETX

Check sum

CR

10

1 100 10-1 10-2

(Ｈ) (Ｌ)

Host →

ACK

UT

CR

(Possible to omit)

4-3 Reading internal sensor

As the minimum unit is 0.01 deg.C, the value in the hundredths place can be read.

Host →

ENQ

32H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

STX

32H

Internal sensor

ETX

Check sum

CR

10

1

10

0 10-1 10-2

(Ｈ) (Ｌ)

Host →

ACK

CR

(Possible to omit)

Note）2DH is entered in 101 digit “-“ is attached to temperature data.

<Specifying unit>
Host →

SOH

UT

ENQ

32H

Check sum

CR

(Ｈ) (Ｌ)
← Thermo-con

SOH

UT

STX

32H

Internal sensor

ETX

Check sum

CR

10

1

10

0 10-1

10

-2

(Ｈ) (Ｌ)

Host →

ACK

UT

CR

(Possible to omit)

Note）2DH is entered in101 digit “-“ is attached to temperature data.

Details of Communication Format

HEC 4-3

4-4 Reading external sensor

As the minimum unit is 0.01 deg.C, the value in the hundredths place can be read.

Host →

ENQ

33H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

STX

33H

External sensor

ETX

Check sum

CR

10

1 100 10-1

10

-2

(Ｈ) (Ｌ)

Host →

ACK

CR

(Possible to omit)

Note）2DH is entered in 101 digit “-“ is attached to temperature data.

<Specifying unit>

Host →

SOH

UT

ENQ

33H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

SOH

UT

STX

33H

External sensor

ETX

Check sum

CR

10

1

10

0 10-1

10

-2

(Ｈ) (Ｌ)

Host →

ACK

UT

CR

(Possible to omit)

Note）2DH is entered in 101 digit “-“ is attached to temperature data.

4-5 Reading alarm status

Host →

ENQ

34H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

STX

34H

Data

ETX

Check sum

CR

D1 D2 D3 (Ｈ) (Ｌ)

Host →

ACK

CR

(Possible to omit)

Details of Communication Format

HEC

4-4

<Specifying unit>
Host →

SOH

UT

ENQ

34H

Check sum

CR

(Ｈ) (Ｌ)
← Thermo-con

SOH

UT

STX

34H

Data

ETX

Check sum

CR

D1 D2 D3 (Ｈ) (Ｌ)

Host →

ACK

UT

CR

(Possible to omit)

Data (D2, D2, D3) changes following bit line to ASCII code. (1 is for ON, 0 is for OFF)

D1

2

3 22

2

1

20

High temp. cut off alarm ERR12

Low temp. cut off alarm ERR13
Unused
Output failure alarm ERR15

D2

2

3 22 21 20

Upper temperature limit alarm WRN

Lower temperature limit alarm WRN

Thermostat alarm ERR14

DC power supply failure alarm ERR11

D3

2

3 22 21 20

External sensor failure alarm ERR18
Internal sensor failure alarm ERR17
During Auto tuning or auto tuning warning ERR19
Flow switch alarm ERR16 or level switch alarm ERR20

When some alarms/warnings go off at the same time, D1 to D3 reaches the added value.

Ex. When the “Upper temperature limit alarm” and the “DC power voltage alarm” go off simultaneously,

D2 will be 23X1+22X0+21X0+20X1=9(=39H).

Details of Communication Format

HEC 4-5

4-6 Reading temperature average data

Note) For this product, the average temperature data, Tm, indicates the temperature of the external

sensor. Refer to “4-4 Reading external sensor” for the format.

4-7 Offset setting (without writing EEPROM)

Set offset of each Thermo-con from host. In this command, offset data loses effect with furning power to

OFF because it isn’t memorized into EEPROM.

It can be set at a minimum of every 0.01 deg.C.

Host →

STX

36H

Offset

ETX

Check sum

CR

Symbol 10

0 10-1 10-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

CR

Note)As for symbols, minus is indicated by “-“(=2DH) and plus is indicated by “0”(=30H).

<Specifying unit>
Host →

SOH

UT

STX

36H

Offset

ETX

Check sum

CR

Symbol 10

0 10-1 10-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

UT

CR

Note)As for symbols, minus is indicated by “-“(=2DH) and plus is indicated by “0”(=30H).

4-8 Reading offset

As the minimum unit is 0.01 deg.C, the value in the hundredths place can be read.

Host →

ENQ

36H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

STX

36H

Offset

ETX

Check sum

CR

Symbol 10

0 10-1 10-2

(Ｈ) (Ｌ)

Host →

ACK

CR

(Possible to omit)

Note) As for symbols, minus is indicated by “-“(=2DH) and plus is indicated by “0”(=30H).

Details of Communication Format

HEC

4-6

<Specifying unit>
Host →

SOH

UT

ENQ

36H

Check sum

CR

(Ｈ) (Ｌ)

← Thermo-con

SOH

UT

STX

36H

Offset

ETX

Check sum

CR

Symbol 10

0 10-1 10-2

(Ｈ) (Ｌ)

Host →

ACK

UT

CR

(Possible to omit)

Note) As for symbols, minus is indicated by “-“(=2DH) and plus is indicated by “0”(=30H).

4-9 Temperature setting (with writing EEPROM)

The host computer sets temperature of each Thermo-con. In this command, temperature setting data is

written in EEPROM.

The setting range is from 10.0 to 60.0 deg.C. As 0.1 deg.C is the minimum unit, the number in the
hundredths place (10-2) should always be 0 (=30H). (When the value at every 0.01deg.C is input, it is
rounded off.)

Host →

STX

37H

Setting data

ETX

Check sum

CR

10

1

10

0 10-1

10

-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

CR

<Specifying unit>

Host →

SOH

UT

STX

37H

Setting data

ETX

Check sum

CR

10

1

10

0 10-1

10

-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

UT

CR

Details of Communication Format

HEC 4-7

4-10 Offset setting (with writing EEPROM)

Set offset of each Thermo-con from host. In this command, offset data is memorized into EEPROM.

It can be set at every minimum unit of +/-0.01 deg.C.

Host →

STX

38H

Offset

ETX

Check sum

CR

Symbol 10

0

10

-1

10

-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

CR

Note)As for symbols, minus is indicated by “-“(=2DH) and plus is indicated by “0”(=30H).

<Specifying unit>
Host →

SOH

UT

STX

38H

Offset

ETX

Check sum

CR

Symbol

100 10-1

10

-2

(Ｈ) (Ｌ)

← Thermo-con

ACK

UT

CR

Note) As for symbols, minus is indicated by “-“(=2DH) and plus is indicated by “0”(=30H).

Troubleshooting

HEC 5-1

5 Troubleshooting

The table below shows the solutions for the problems.

Problem

Cause

Solution

Communication cannot be
made.

A wrong connecting cable is used.

Connect the host and the thermo­con with the following cables:

A cross cable for RS-232C
A straight cable for RS-485

The settings of the host and
thermo-con are not consistent with
each others.

Make the following settings of the
host and the thermo-con
consistent:

Unit Number, Baud Rate, Parity Bit,
Data Length, Stop Bit

The program is incorrect.

Ensure that the program is made

properly according to this operation
manual. (Control code, command
code, checksum, etc.)

The communication method is
incorrect.

Use the communication method
suitable for the specification of the
thermo-con (RS-485, RS-232C).

It is influenced by the noise from

outside.

Use a shield wire for the cable, and
ground the shield to the field
ground.

It is influenced by the reflected
wave.

Install a terminating resistance.

Temperature cannot be set.
Four digits are not input for the

setting temperature.

Input four digits for the setting

temperature. As 0.1 deg.C is the
minimum indication unit, input 0
(=30H) in the hundredths place.

Value out of the setting range is

input.

Set it within the temperature setting

range (between 10.0 and 60.0
deg.C).

Communication cannot be
continued.

It exceeds the writable capacity of
EEPROM (approx. 1 million times).

Ask SMC for repair.

The connecting cable comes off or

broken.

Check the connecting cable.

The thermo-con does not give
a correct answer.

The host sends more than one
communication data successively.

When sending communication
data, wait until an answer from the
thermo-con is received to send the
next data.

Communication Format and Examples of Answers from Thermo-con

HEC 6-1

6 Communication Format and Examples of Answers from Thermo-con

Examples of commands and answers from the thermo-con (unit unspecified)

Command

code

ASCII

Command

Unit

specified

Host requirement

Answer from thermo-con

Content

31

Reading setting
temperature

No

05 31 33 31 0D

02 31 32 35 30 30 03 3F 38
0D

Answer “25.0

deg.C.”

31

Temperature setting
(without writing
EEPROM)

No

02 31 32 35 30 30 03 3F 38
0D

06 0D

Set at 25.0
deg.C

32

Reading internal
sensor

No

05 32 33 32 0D

02 32 32 35 30 32 03 3F 3B
0D

Answer “25.02
deg.C”

33

Reading external
sensor

No

05 33 33 33 0D

02 33 33 30 30 32 03 3F 38
0D

Answer “30.02
deg.C”

34

Reading alarm status

No

05 34 33 34 0D

02 34 30 38 30 03 3C 3C 0D

Answer
“ERR11”

36

Reading offset
Offset setting (without

writing EEPROM)

No
No

05 36 33 36 0D
02 36 30 31 35 30 03 3F3C

0D

02 36 2D 31 35 32 03 3F 3B
0D

06 0D

Answer “-1.52
deg.C”

Set at +1.50
deg.C

37

Temperature setting
(with writing EEPROM)

No

02 37 32 35 30 30 03 3F3E
0D

06 0D

Set at 25.0
deg.C

38

Offset setting
(with writing EEPROM)

No

02 38 30 31 35 30 03 3F3E
0D

06 0D

Set at +1.50
deg.C

Examples of commands and answers from the thermo-con (unit specified)

Command

code

ASCII

Command

Unit

specified

Host requirement

Answer from thermo-con

Content

31

Reading setting
temperature

2

01 32 05 31 36 38 0D

01 32 02 31 32 35 30 30 03 32
3C 0D

Answer “25.0
deg.C”

31

Temperature setting
(without writing
EEPROM)

2

01 32 02 31 32 35 30 30 03
32 3C 0D

06 32 OD

Set at 25.0
deg.C

32

Reading internal
sensor

2

01 32 05 32 36 39 0D

01 32 02 32 32 35 30 32 03 32
3F 0D

Answer “25.02
deg.C”

33

Reading external
sensor

2

01 32 05 33 36 3A 0D

01 32 02 33 33 30 30 32 03 32
3C 0D

Answer “30.02
deg.C”

34

Reading alarm status

2

01 32 05 34 36 3B 0D

01 32 02 34 30 38 30 03 30 30
0D

Answer
“ERR11”

36

Reading offset
Offset setting (without

writing EEPROM)

2
2

01 32 05 36 36 3D 0D
01 32 02 36 30 31 35 30 03

33 30 0D

01 32 02 36 2D 31 35 32 03 32
3F 0D

06 32 0D

Answer “-1.52
deg.C”

Set at +1.50
deg.C

37

Temperature setting
(with writing EEPROM)

F

01 3F 02 37 32 35 30 30 03
33 3F 0D

06 3F 0D

Set at 25.0
deg.C

38

Offset setting
(with writing EEPROM)

F

01 3F 02 38 30 31 35 30 03
33 3F 0D

06 3F 0D

Set at +1.50
deg.C