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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 10ms (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 22 bits time after sending a command

message.

6. DETAILS OF MESSAGE

6.1 Read-out of Word Data [Function Code: 03]

Read the contents of holding registers (0000~ 007D) in the slave.
Broadcast is not possible.

1. Message composition

Command message composition

Address Function Starting Address Word Number*

CRC-16

01~FF

0xxx

0001~007E Low-order byte High-order byte

1 byte

2 byte

2 bytes

* Maximum word number = 7E
Response message composition

Address Function Byte Number *

Word Data

CRC-16

01 ~ FF

02~FC

Low-order byte High-order byte

1 byte

1 bytes

N bytes

2 bytes

* Byte number = Word number × 2

2. Message transmission (example)

The following show an example of reading the Setpoint Value (1000) from address No.1
controller.
Command message composition

Address Function Starting Address Word Number

CRC-16

01 03

0000

0001

840A

Response message composition

Address Function

Byte Number

Word Data

CRC-16

01 03

03E8

B8FA

6.2 Read-out of Read-Only Word Data [Function Code: 04]

Read the contents of input registers (1000~1002) in the slave.
Broadcast is not possible.

1. Message composition

Command message composition

Address Function Starting Address Word Number

CRC-16

01~FF

1xxx

0001~007E Low-order byte High-order byte

1 byte

2 bytes

Response message composition

Address Function Byte Number

Word Data

CRC-16

01 ~ FF

02~FC

Low-order byte High-order byte

1 byte

N bytes

2 bytes

2. Message transmission (example)

The following show an example of reading the Process Value (27) from address No.1 controller.
Command message composition

Address Function Starting Address Word Number

CRC-16

01 04

1000

0001

350A

Response message composition

Содержание SE6000 Series

Страница 1: ...ing Operation Method 2 5 MODBUS COMMUNICATION PROTOCOL 5 1 General 3 5 2 Composition of Message 3 5 3 Response of Slave Station 4 5 4 Function Code 4 5 5 Calculation of Error Check Code CRC 16 4 5 6 Transmission Control Procedure 5 6 DETAILS OF MESSAGE 6 1 Read out of Word Data Function Code 03 6 6 2 Read out of Read Only Word Data Function Code 04 6 6 3 Write in of Word Data 1 word Function Code ...

Страница 2: ... 2 1 Communication Specifications Item S pecification Electrical specification Based on EIA RS 485 Transmit system 2 wire semi duplicate Synchronizing system Asynchronous mode Connection format 1 N Number connection unit Up to 255 units Transmission distance 500m max Transmission speed 2400 4800 9600 19200 selectable Start bit 1 bit Data length bit 8 bits Parity bit None Data format Stop bit 2 bit...

Страница 3: ...e at delivery Setting range Remarks BAUD Transmission speed 9600 2400 4800 9600 19200 Data length 8 bits Fixed can t be changed Stop bit 2 bit Fixed can t be changed Parity setting None Fixed can t be changed Set the same communication condition to the master station and all slave station ADDR Address 1 1 to 255 Set a different value to each station 4 2 Setting Operation Method The following examp...

Страница 4: ...d is explained 1 Start In RTU mode messages start with a silent interval of at least 3 5 character times This is most easily implemented as a multiple of character times at the baud rate that is being used on the network shown as T1 T2 T3 T4 in the figure above The first field then transmitted is the device address 2 Address Address is the number specifying a slave station Valid slave device addre...

Страница 5: ...mmand but creates and sends back a response message at error detection The composition of response message at error detection is shown on below the value used for function field is function code of command message plus 80H ADDRESS FUNCTION Function code 80H ERROR CODE CRC CHECK 8 BITS 8 BITS 8 BITS 16 BITS Error Code Contents Description 01 Illegal function The function code received is not an all...

Страница 6: ... 1 1 5 For ensuring the safety make a confirmation of the response message and make an arrangement so as to provide 3 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 9600 bps ...

Страница 7: ...bytes 2 bytes Byte number Word number 2 2 Message transmission example The following show an example of reading the Setpoint Value 1000 from address No 1 controller Command message composition Address Function Starting Address Word Number CRC 16 01 03 0000 0001 840A Response message composition Address Function Byte Number Word Data CRC 16 01 03 02 03E8 B8FA 6 2 Read out of Read Only Word Data Fun...

Страница 8: ...s controllers 1 Normal value The data value is transfer into Hexadecimal regardless of decimal For example 1000 will be transfered to 03E8 hex However such as output percentage and Pb proportional band 100 0 will be transfered to 03E8 hex 2 Index code Some parameters value are set by index code For example to change the unit to via communication The data value would be 0017 hex Code English Code E...

Страница 9: ...e 000F UNIT ENG English code 0010 DP 0000 000 0 00 00 0 000 English code 0011 ACT REV DIR English code 0012 LOLT 1999 9999 0013 HILT 1999 9999 0014 FILT 0 0 100 0 0015 A1FU None Hi Lo dif H dif L bd Hi bd Lo T SNL English code 0016 A1MD None Stdy Lath St La T End English code 0017 A2FU None Hi Lo dif H dif L bd Hi bd Lo T SNL English code 0018 A2MD None Stdy Lath St La T End English code 0019 A3FU...

Страница 10: ... connection distance are as specified Whether communication conditions coincide between the master station host computer and slave station SE6000 Transmission speed 2400 bps 4800 bps 9600 bps 19200 bps Address 01 FF master and slave station must be match Whether send receive signal timing conforms to Section 5 4 in the manual Whether more than one instrument connected on the same transmission line...

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