Toho Electronics TTM-00BW User manual

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ＴＯＨＯＥＬＥＣＴＲＯＮＩＣＳＩＮＣ．

Operation Manual (Communication Edition)

(TOHO Protocol, MODBUS）

Model:

TTM-00BW

Name:

Board Type Digital Controller

久德電子有限公司台中市西區福人街11號 TEL:04-23729418 FAX:04-23724011 Email: [email protected]

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Thank you very much for purchasing the TTM-00BW (with a communication function).

Kindly read this operation manual for proper usage.

Table of Contents

1. Before Using the Product ．．．．．．．Page 4

1.1 About the Operation Manual

1.2 Requirements for Communication

1.3 Things the Communication Function Can Do

1.4 Position (Priority) of Communication

1.5 Settings to Be Made Prior to the Communication

2. Setting about TOHO Communication ．．．Page 5

2.1 Outline

2.2 Setting of Data Length

2.3 Setting of Stop Bit

2.4 Setting of Parity

2.5 Setting of BCC Checking

2.6 Setting of Communication Speed

2.7 Setting of Communication Address

2.8 Setting of Response Delay Time

2.9 Switching of Communication Mode

3. TOHO Communication Control ．．．．．．Page 7

3.1 Communication Procedures

3.2 Kinds of Message

3.3 Structure of Request Message (Data transmission from upper computer to this product)

3.4 Structure of Response Message (Data transmission from this product to upper computer)

3.5 Explanation about Codes (e.g., List of Errors)

3.6 Things to Be Noted during the Communication

4. Example of TOHO Communication ．．．．Page 13

4.1 Sample Communication for Reading

4.2 Sample Communication for Writing

5. Setting about MODBUS Communication ．．Page 15

5.1 Outline

5.2 Setting of Data Length

5.3 Setting of Stop Bit

5.4 Setting of Parity

5.5 Setting of BCC Checking

5.6 Setting of Communication Speed

5.7 Setting of Communication Address

5.8 Setting of Response Delay Time

5.9 Switching of Communication Mode

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6. MODBUS Communication Control ．．．．．Page 17

6.1 Communication Procedures

6.2 Kinds of Message

6.3 Structure of RTU Request Message (Data transmission from upper computer to this product)

6.4 Structure of RTU Response Message (Data transmission from this product to upper computer)

6.5 Explanation about RTU Codes (e.g., List of Errors)

6.6 Things to Be Noted during RTU Communication

6.7 Sample Computation of CRC-16

6.8 Structure of ASCII Request Message (Data transmission from upper computer to this

product)

6.9 Structure of ASCII Response Message (Data transmission from this product to upper

computer)

6.10 Explanation about ASCII Codes (e.g., List of Errors)

6.11 Things to Be Noted during ASCII Communication

6.12 Sample Computation of LRC

7. Specifications ．．．．．．．．．．．．Page 30

7.1 Type of Communication Standard

7.2 Communication Specifications

8. Wiring ．．．．．．．．．．．．．．．．Page 31

9. List of Identifiers (Codes) ．．．．．Page 32

10. List of ASCII Codes ．．．．．．．．．Page 36

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1. Before Using the Product

1.1 About the Operation Manual

This manual explains the communication function of TTM-00BW (hereinafter referred to as "Product").

1.2 Requirements for Communication

The communication function of the product is optional. Therefore, you need to specify the communication

option (RS-485) upon purchase.

1.3 Things the Communication Function Can Do

This function allows the user to write and read the items of this product that are described in "9.

List of Identifiers,"

such as "To change, start, or stop items that can be operated through front keys" and "To read the

information that can be displayed on the display section."

However, since the RAM of this product is used during the reading/writing of data through

ordinary command, data that was written will be replaced by the previous data (data that is saved

in the EEPROM) if the power is turned OFF and then turned ON.

To save the written data into the EEPROM of this product, execute the save request message.

(See 3.6, 6.6, and 6.11, “Things to Be Noted during the Communication.”)

Furthermore, unnecessary setting items, such as items that are related to the unattached option, will

not be read and written.

1.4 Position (Priority) of Communication

This product allows the user to change data and parameters through the key even during the operation

under communication mode.

Change of settings of data and parameters via communication will be disabled while the product is operated

under RO (Read Only) (provided, however, that the switching of communication mode is possible).

1.5 Settings to Be Made Prior to the Communication

Several settings need to be made to this product in order for it to perform a communication function.

See "2. Setting about TOHO Communication" or "5. Setting about MODBUS Communication."

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2. Setting about TOHO Communication

2.1 Outline

Initial settings need to be made to the product in order for it to perform a communication function.

The setting shall be done by keys at the front side.

Follow the procedure shown below to navigate between setting screens. See the User's Manual of this

product for details.

Power ON

↓

Initial Screen (4 seconds)

↓

Operation Mode

↓MODE Key More than 2 seconds

Setting Mode Selection Screen

↓▲▼ Key

Communication Setting Mode

↓MODE Key

Setting of Communication Protocol

: TOHO Communication Protocol (Initial Value: )

↓MODE Key

Setting of Communication Parameters

↓MODE Key

Setting of Communication Speed

↓MODE Key

Communication Address Setting

↓MODE Key

Setting of Response Delay Time

↓MODE Key

Setting of the Switching of Communication Mode

↓MODE Key

Back to Communication Setting Mode

When the setting is done, press the MODE key for more than 2 seconds to return to the operation

mode. Each parameter shown above is the initial value.

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2.2 Setting of Data Length

2.3 Setting of Stop Bit

2.4 Setting of Parity

2.5 Setting of BCC Checking

Set the value by pressing the ▲▼ keys on the "Setting of Communication Parameters" screen in a previous

page. The initial value is .

＊＊＊＊

Stop Bit 1

Stop Bit 2

Without Parity

Odd Parity

Even Parity

Data Length 7 Bits

Data Length 8 Bits

Without BCC Checking

With BCC Checking

2.6 Setting of Communication Speed

Set the value by pressing the ▲▼ keys on the "Setting of Communication Speed" screen in a previous

page. The initial value is .

＊＊＊＊

1200 BPS

2400 BPS

4800 BPS

9600 BPS

19200 BPS

2.7 Setting of Communication Address

Set the value by pressing the ▲▼ keys on the "Setting of Communication Address" screen in a previous

page. The initial value is .

Setting Range: 1-99 stations (Setting of 0 is not allowed)

2.8 Setting of Response Delay Time

Set the time to take for the upper computer to complete the receiving of "request message," open the

line, and get ready for the next input.

Set the value by pressing the ▲▼ keys on the "Setting of Response Delay Time" screen in a previous

page. The initial value is .

Setting Range: 0-250mSEC

＊Communication may not be performed properly if the response delay time is too short.

＊In actual operation, the processing time of the product will be added to the response delay time.

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2.9 Switching of Communication Mode

Set the value by pressing the ▲▼ keys on the "Setting of the Switching of Communication Mode" screen

in a previous page. The initial value is .

Read/Write

Read Only

3. TOHO Communication Control

3.1 Communication Procedures

This product returns the "response message" as a reply to the "request message" that will be sent

by the upper computer.

Therefore, the transmission will never be initiated by this product.

3.2 Kinds of Message

■ Kinds of message can be briefly classified into the following:

■ All codes up to ETX, such as STX and data (except for BCC), will be expressed in ASCII code.

■ To code the program for the upper computer, see "9. List of Identifiers" and "10. List of ASCII

Codes" at the end of this document.

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3.3 Structure of Request Message (Data transmission from upper computer to this product)

■ See "3.5 Explanation about Codes" for codes from ① to ⑩.

■ See "4.1 Sample Communication for Reading" and "4.2 Sample Communication for Writing" for concrete

samples of the request message.

3.3.1 Structure of Read Request Message

3.3.2 Structure of Write Request Message

3.3.3 Structure of Save Request Message

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3.4 Structure of Response Message (Data transmission from this product to upper computer)

■ See "3.5 Explanation about Codes" for codes from ① to ⑩.

■ See "4.1 Sample Communication for Reading" and "4.2 Sample Communication for Writing" for concrete

samples of the request message.

3.4.1 Response Message for Read Request Message

3.4.2 Response Message for Write/Save Request Message

3.4.3 Response Message for the Error

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3.5 Explanation about Codes

■ The following codes from ① STX, ② Address, up to ⑩ Error Type will be expressed in ASCII code:

■ See "10. List of ASCII Codes" for the details about ASCII codes.

■ To convert into ASCII code, see "4. Sample TOHO Communications."

①STX

It is a code that is necessary for the receiving side to detect the start of the message.

It shall be attached to the start of the character string to be sent.

②Address

It is an address of the device that will be communicated by the upper computer (this product).

The address in the response message from this product indicates the source of the response

message.

③Contents of Request

Set the symbol R, W, L, or B.

R: If the data is to be read from the product

W: If the data is to be written or saved into the product

Ｌ: If the blind setting is to be read from the product

Ｂ: If the blind setting is to be written into the product

④Identifier

It is a classification symbol (identifier) of the data to be read or written that will be

expressed by the 3-digit alphanumeric characters.

See "9. List of Identifiers (Codes)."

⑤Numerical Data

It is a data for reading or writing which will be expressed in 5-digit characters regardless

of the data type.

Negative data: The symbol "-" is considered one digit to be displayed at the largest digit.

Position of decimal point: Decimal point will not be included in the 5-digit data.

Example: 5-digit numerical data "-1999" means the following:

Settings

Meaning of Numerical

Value

Data of which the posi-

tion of decimal point can

be changed (PV/SV), etc.

If the position of decimal point [_ dP] is 0

-1999

If the position of decimal point [_ dP] is 0.0

-199. 9

If the position of decimal point [_ dP] is 0.00

-19. 99

If the position of decimal point [_ dP] is 0.000

-1. 999

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