====== Interfacing with the MOACON ======

Connect the ComfileHMI's RS-232 port to the MOACON's RS-232 port as illustrated below (The Mocaon supports Modbus RTU on channels 0, 1, and 2).

{{ :comfilehmi:hmi_connection_moacon:connectionmoacon.png?nolink |}}

{{ :comfilehmi:hmi_connection_moacon:dsc04034.png?nolink&500 |}}

Use the [[http://www.comfiletech.com/embedded-controller/moacon/accessories/rs232-terminal-contact/|RS232 Terminal Contact]] to make the connections.

{{ :comfilehmi:hmi_connection_moacon:dsc04033.png?nolink&500 |}}

\\ 

For RS-485, connect the ComfileHMI's RS-485 port to the MOACON's RS-485 port as illustrated below.

{{ :comfilehmi:hmi_connection_moacon:rs485.png?nolink |}}

===== ComfileHMI's Communication Settings ======

When creating a new project, select the //COMFILE// and //MOACON// protocols.

{{ :comfilehmi:hmi_connection_moacon:eprj2.png?nolink |}}

In the ComfileHMI project, use the addressing scheme described here:  https://en.wikipedia.org/wiki/Modbus#Modbus_object_types
====== Moacon Source Code ======

Please use the latest version of MOACON Studio.

The following minimal source code illustrates how to create a Modbus RTU slave on serial channel 0.

<code c>
#include "moacon500.h"
void cmain(void)
{
	static u8 MDcoil[100];
	static u16 MDregister[100];
	openCom(0,115200, C8N1);                // RS232C Channel 0 at 115200bps
	startModbusRtu(0,1,MDregister, MDcoil); // Start the Modbus RTU slave with slave address 1

	delay(100);
	for(;;) { }    // Loop forever                 
}
</code>


  * The above source code implements a Modbus RTU slave on the MOACON's serial channel 0.  The ComfileHMI will therefore be the MOACON's master.
  * The MOACON only supports 1 Modbus slave at a time regardless of the channel(s) used.  Running two Modbus slaves on two different channels is not supported.
  * If you experience communication problems between the MOACON and the ComfileHMI, please try the source above for troubleshooting.  If there is a programming error in the MOACON source code, communication between the MOACON and the ComfileHMI can become problematic.

===== coil and coilSet Functions =====

The following functions are provided to make reading and writing individual bits in the Modbus coil region more convenient.

  * coil(addr) : Read bit corresponding to a given Modbus address
  * coilSet(addr, value) : Write bit corresponding to a given Modbus address

<code c>
#include "moacon500.h"

static u8 MDcoil[100];
static u16 MDregister[100];

//
// Read a bit corresponding to a given Modbus address 
// a = coil(9); // Bit corresponding to Modbus address 00009 is read

u8 MDbitDecode[8] = {1,2,4,8,16,32,64,128};

u8 coil(u16 MDBSadr)
{
    MDBSadr--;
    if (MDcoil[MDBSadr>>3] & MDbitDecode[MDBSadr & 7]) return 1;
    return 0;
}

//
// Write bit corresponding to a given Modbus address
// coilSet(9,0); // Set bit corresponding to Modbus address 9 to 0
// coilSet(9,1); // Set bit corresponding to Modbus address 9 to 1 
//

void coilSet(u16 MDBSadr, u8 MDBSdata)
{
    u16 arrayindex;
    MDBSadr--;
    arrayindex = MDBSadr>>3; // The location in the array
    if (MDBSdata==0) 
    {
        MDcoil[arrayindex] &= ~MDbitDecode[MDBSadr & 7];
    }
    else 
    {
        MDcoil[arrayindex] |= MDbitDecode[MDBSadr & 7];
    }
}

void cmain(void)
{
   openCom(0,115200, C8N1);
	startModbusRtu(0,1,MDregister, MDcoil);
	clcdI2cInit(0);
	clcdPower(1);
	delay(100);
	portInit(3,0);
	while(1) 
        {
            MDregister[0]++;  // Increment for verification on the ComfileHMI
            MDcoil[0]++;      // Update coils 1~8 and verify on the ComfileHMI

            if (coil(17) != 0)
            {
                portOn(30);
            }
            else 
            {
                portOff(30);
            }
            
            if (portIn(0)==0)
            {
                coilSet(18,0);
            }
            else 
            {
                coilSet(18,1);
            }
	    delay(1);
        }
}
</code>

A video demonstrating this program can be found below.

====== Video Demonstration ======

<html>
<center>
<iframe width="560" height="315" src="https://www.youtube.com/embed/3eWGlo67NHI" frameborder="0" allowfullscreen></iframe>
</center>
</html>

[[http://comfiletech.com/content/comfilehmi/samples/MOACON%20Test.zip|ComfileHMI project demonstrated in the video above]]

{{ :comfilehmi:hmi_connection_moacon:moacon_test_project.png?nolink |}}

[[comfilehmi:index#ComfileHMI_Connectivity| Back to ComfileHMI]]