Operation Manual

The serial number for Modbus is available. This release was created for you, eager to use Modbus Slave 2.0 full and without limitations. Our intentions are not to harm Modbus software company but to give the possibility to those who can not pay for any piece of software out there.
Slave 1 Slave 2 Master (DCS) Slave 3 Slave 4 Modbus Figure 1.1 Modbus configuration The master can send a query (i.e. Poll) or command to a slave on a regular basis or when required. In either case, the master starts signal transmission and the slave responds. F0102.ai Master Device number Command message Response message Function.

Simply Modbus Slave 2.1

The Plasmionique Modbus Master Library is an open-source add-on package for LabVIEW. It implements the Modbus Application Protocol Specification V1.1b3 for communicating with Modbus devices (slaves) over Asynchronous Serial or TCP/IP networks. NI LabVIEW software can communicate with a programmable logic controller (PLC) in a variety of ways. The Simply Modbus Slave Window. Program Summary: When the program is opened, the circular clock indicator spins to show that the program is running. The program monitors the chosen serial port looking for incoming bytes from a modbus master. All bytes received (and sent) are displayed in the 'Log'.

Modbus RTU Slave and Modbus ASCII Slave Software

System Requirements:

Windows NT, 95, 2000, XP. (not recommended for Windows 7 or Vista )

display resolution: 800 x 600 minimum

PC with serial port (built in, serial card or USB serial port)

Installation - Simply Modbus Slave 2.1 (1.75 MB) : Canon pixma driver for mac.

Click to download SimplyModbusSlave2.1.zip

Unzip the compressed files into a common folder on your hard drive.
Simply Modbus Slave 2.1.exe - the program
serpdrv - serial port driver
Read me Slave 2.1.txt - documentation
Read me for Windows7.txt - documentation

Known Issues with version 2.1: Two instances normally appears in the taskbar while the program is running, the runtime engine and the program iself, Sometimes the runtime engine does not quit when the program is closed, although it is not consistent and behaves differently on different PCs. It is more likely to happen when the program is opened and closed within a few seconds. Waiting longer or sending a request before closing may help it quit properly. It may quit by itself after a few minutes on some Windows 7 and Vista systems. Although it's okay on others.

Work Arounds: It can be forced to quit by right clicking on the taskbar item and selecting close. Using Alt-F4 to quit the program also works better in some cases.

Simply Modbus Slave 7.1 looks and runs exactly like Simply Modbus Slave 2.1 but was created using a newer compiler. It is a significantly larger download and has an install program. It appears to be more stable with the newer Windows versions. see...manual7

Simply Modbus Slave 7.1 will automatically use a license for Simply Modbus Slave if already installed on the PC.

Starting the program

Double-click on Simply Modbus Slave 2.1.exe.

You will see the demonstration startup window.

The progress bar will take approximately 15 seconds to load the demonstration version.
During this time, you can press the ENTER KEY and see

After purchasing and receiving a license key by email, enter the key and press OK.

The licensed program
- goes immediately to the main Simply Modbus Read window and bypasses the demonstration startup window.
- allows unlimited reads and writes.

The demo version
- offers full functionality
- requires a program restart to send more than six replies to requests.

The Simply Modbus Slave Window

Program Summary:

When the program is opened, the circular clock indicator spins to show that the program is running. The program monitors the chosen serial port looking for incoming bytes from a modbus master. All bytes received (and sent) are displayed in the 'Log'.

The most recent request received is displayed in the indicator labelled 'Latest Request received'. A lookup is done to determine if the request has a valid SlaveID, function code, data addresses, valid data if writing and valid error detection bytes (CRC or LRC.

The request must meet the following 2 conditions before a response is generated and sent:

1) The ID in the request (the first byte received) must match the entered Slave ID,
or 'Respond to all Slave IDs' must be checked.
If the ID does not match, the Slave program will ignore the request since it is intended for a different slave.

2) The CRC (if RTU mode) or LRC (if ASCII mode) at the end of the request must be correct.

The request must meet the following additional conditions before a response with data is generated and sent:
3) the request must have a function code that matches enabled data in the tables.
Function code 03 or 04 to read registers with a block of register data set with the same code.
Function code 06 or 16 to write registers with a block of register data set as read/write.
Function code 01 or 02 to read coils with a block of coil data set with the same code.
Function code 05 or 15 to write coils with a block of coil data set as read/write.
If not, an exception code 01 is generated and sent.

4) The requested registers or coils must exist in an enabled block. More specifically, the request must be for register
or coil addresses with a hex values that match the register number minus offset for one of the enabled tables.
If not, an exception code 02 is generated and sent.
For example, A request for 0003 addresses starting from 0002 will match a block setup with Registers 40001 to
40008 and offset 40001. It will reply with data from 40003, 40004 & 40005. A request for 0007 addresses
starting from 0002 will not match the same block, since it needs registers 40003 through 40009.
Since 40009 does not exist in the block, an exception code 02 would be generated and sent.

5) When receiving function codes that request writing data, the data size and format must be correct.
If not, an exception code 03 is generated and sent.
For example, A FC16 request to write 0005 16bit addresses must contain 10 data bytes (two per address),
otherwise an exception code 03 would be generated and sent.
When a response is generated, it is written to the serial port and the Log.

On a multi-dropped network (eg. RS485) with multiple slaves, this application will also receive responses from other slaves.
All messages received will be monitored and processed to determine if they are valid requests from a modbus master.

Setup Details:

Controls (inputs) that can be changed by the user are shown in yellow.
Indicators (outputs) that cannot be changed are shown in blue.

Enter the input information in the controls to match the Slave you wish to emulate.

Select RTU or ASCII mode. more info..

Select the serial port on your PC that is connected to a modbus master.
Range = COM1 to COM10

serial settings: Set these settings to match the setting of the modbus slave device connected.
baud: The baud rate (bits per second) of the serial connection.
data bits: The number of data bits in each byte, RTU mode requires 8, ASCII mode is usually 7 but may be 8.
stop bits: The number of stop bits for each byte sent. allowable values are 1, 1.5 or 2 .
parity: The value of the parity bit for each byte sent. allowable values are none, odd, even, mark or space.

The 1st byte in the Request and Response strings
The unit address of the Slave device to be emulated. normal range: 1 to 247
The program will only respond to requests directed to this Slave ID.

Modbus Master Tool

When this box is checked, the program will respond to requests directed to any Slave ID.

Other Settings:

When checked, the program will send the data high byte first
When checked, the program will send the data high word first for 32 bit data types.

When checked, the program will apply a random multiplier to the values found in the tables
to a maximum of the '%reading' value entered.
The program will then give slightl

Modbus Slave 4 Keygen