Modbus RTU Slave

Modbus RTU Slave(Server)

 

Supported Devices and Requirements

 

Description

Notes

Distributor

MODICON

 

Device

Any MODBUS RTU supported devices

 

Comm. Module

 

 

Comm. Method

Serial (RS232c , RS422, RS485)

 

Protocol

MODBUS RTU

 

Driver Description

Modbus RTU Slave

 

Device Settings

In the window as shown below, the user can set the station and the COM port.

 

Item

Description

COM Port (통신포트)

In this tab, the user can set the settings that are related to UltimateAccess Web.

Station (스테이션)

The user can set the stations. Press [Add] (스테이션 추가) to add a station.

Item

Description

Station name (스테이션 이름)

Sets the name of the station.

Description

Sets the description of the station.

Unit ID (통신보드 국번)

Sets the unit ID of the station.

  • Data Type (데이터 종류) : Coil Status (Digital) / Input Status (Digital) / Holding Register (Analog) / Input Register (Analog)의 네 가지 종류 중의 하나를 지정합니다.

Data Type

Type

R/W

Identifier

No. of data

Function code

Coil Status

Digital

Read/Write

0

255

1(5,15)

Input Status

Digital

Read Only

1

255

2

Input Register

Analog

Read/Write

4

255

3(6,16)

Holding Register

Analog

Read Only

3

255

4

Identifier means that the tag’s address in UltimateAccess Web must start with it. For example, using Coil Status and its address 102 means that the address is 00102.

Function code means the MODBUS protocol’s command code used to read the corresponding data type in this I/O driver. The code in the brackets are used to write the corresponding data type.

 

  • Address : After deciding the identifier, designate the starting address of the block. It must be within the range of 1 to 65536.

  • No. of data : Sets the number of data to read, starting from the address assigned to Address. For digital types, the number of data is always in bits. For analog types, the number of data is always in words.

COM Port

In this tab, the user can set the UltimateAccess Web’s communication port settings.

  • COM Port (통신포트) : Sets the COM port where the UltimateAccess Web-installed system is connected to the target device.

  • Baudrate (전송속도) : Sets the baudrate ranging from 300 to 115200 BPS.

  • CTS/RTS : Select this option depending on the communication cable’s wiring.

  • Parity : None, Even, or Odd

  • Data Bits : 8 Bits (Do not select 7 bits)

  • Stop Bits : 1 Bit or 2 Bits