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Modbus RTU Master Implementation; GUI - demo

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Author: Vladimir Djukovic

Last Updated: 2013-04-14

Package Version: 1.0.0.1

Category: Communication

Downloaded: 3173 times

Not followed.

License: MIT license

The project contains a simple graphical user interface software mainly used as a testing tool and integral part of the entire application which refers to the Modbus RTU application protocol implemented in master controllers based on MCUs.

NEW: Modbus RTU Master function codes library, basic functions added

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[older versions]

DOWNLOAD LINK	RELATED COMPILER	CONTAINS
1365988149_modbus_rtu_maste_mikroc_pic.rar [1.42MB]	mikroC PRO for PIC	lib src exa hlp hex sch pcb doc

Library Blog

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main display

Video1

01 06 There is a mistake in this video, BROADCAST IS NOT SUPPORTED by fcode 01 and has no sense there.

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Video2

0vide02

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NEW, 14.04.2013.

FUNCTION CODE LIBRARY ADDED:

01 Read Coil Status

02 Read Input Status

03 Read Holding Registers

04 Read Input Registers

05 Force Single Coil

06 Preset Single Register

Under Function codes Library section of the package file:

Look at the picture bellow (package Modbus RTU Master installed);

opcode:

Modbus_MASTER_Config (baud_rate, system_clock, parity_setting);

//baud rate in bps

//system_clock in MHz

//parity setting:

//- 0 no parity check involved

//- 1 odd parity applied

//- 2 even parity

//Timeout value set

Timeout_Set (timeout_value); //timeout value in miliseconds, 1500ms by default

// 01 Read Coil Status

Function_01 (slave_address, starting_address, number_of_coils);

// 02 Read Input Status

Function_02 (slave_address, starting_address, number_of_inputs);

// 03 Read Holding Registers

Function_03 (slave_address, starting_address, number_of_registers);

// 04 Read Input Registers

Function_04 (slave_address, starting_address, number_of_registers);

// 05 Force Single Coil

Function_05 (slave_address, coil_address, force_data); // force_data (coil state) = 0 or 1

// 06 Preset Single Register

Function_06 (slave_address, register_address, preset_data);

Example:

//Modbus RTU Master initialization

Modbus_MASTER_Config (9600, 16., 2); // baud rate = 9600 bps, f_osc = 16Mhz, even parity,

// TIMEOUT is 1500ms by default

// note: system_clock value is required in order to get // UART baud rate parameters calculated

Timeout_Set (2500); // new value for the timeout period approximatelly2500ms

// .....

// part of code where the user software (master device) initiates Modbus transaction

// eg. the master requests contents of ten holding registers at adresses 40250 to 40259 from slave

// device 15

Function_03 (15, 250, 10);

// the response message is being stored into resp_msg, 256 bytes long array that is defined within

// the library, it can't be redefined by the user, it has sufficient capacity to recive the longest Modbus // RTU ADU frame (256 bytes) anyway

// the user software serves over the received message content

// there is a 8-bit status register defined by the library RESPSTAT which status bits tells the // master whether a response mesage is received or not upon the receiving is complete. It is on the // user software to check it out. That part of code should be applied as the next section after writting // function code library function

RESPSTAT register:

bit 7: -

bit 6: -

bit 5: -

bit 4: -

bit 3: RERR communication error occured

bit 2: TOUT TIMEOUT expired

bit 1: ROK RESPONSE OK

bit 0: MRXF calculated number of mesage bytes received (reception complete)

example: (continued from the previous modbus requesting)

if (ROK_bit == 1)

Response_processing(); // response OK (expected response received - normal or exception)

else

Response_fault (); // none response received, timeout expired or communication error

package file

function codes library

Modbus RTU

TESTING RS232 Master - Slave

video 3

Library test: Read Holding Registers - example

Watch on YouTube

video 4

Library Test: Parity error vs TIMEOUT (unmatched parity check option)

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