I think you may create a custom page, you should start look at CustomViewExample.jsp.

If you have the sources look at this topic.

http://mango.serotoninsoftware.com/forum/posts/list/268.page#1223

If not, try ScadaBR.

It seems that Mango M2M and Mango M2M2 are already retired and with no stable version and also no sources, so You'd better using Scadabr, it is a fork from Mango.
Scadabr's forum is only in portuguese but you can post english messages there.
Their suport is not good as the Mango used to be but there are sources available and it seems to work fine. There are lot of bugs also but the team is still active.

http://sourceforge.net/projects/scadabr

Also take a look at this:

http://sourceforge.net/projects/scadabr/files/Software/Docs/OPC Configuration ScadaBR.pdf/download

and this

http://mango.serotoninsoftware.com/forum/posts/list/15/599.page

Very useful examples, I would like to set an RTC clock using two select combobox: Hours 0-23 and Minutes 0-59.
The datapoint must be set in seconds, so I need two combos performing some scripting like get the value of hours3600 plus minutes60.
I am trying but could not do it yet.
Here is my code, it works outside mango, but could not set the datapoint from this, anyone could help?

<script language="JavaScript">

function checar() {

campo1 = document.form.select1;
campo2 = document.form.select2;

if(campo1.value!="") {
valor1=campo1.value;
} else {
valor1=""; 
}


if(campo2.value!="") {
valor2=campo2.value;
} else {
valor2=""; 
}

um = valor1*3600; // hour to seconds
dois = valor2*60; // minutes to seconds
totalSec = um+dois;

if(um=="" && dois=="") {
document.form.total.value=""; 
} else {
document.form.total.value=totalSec; 
//mango.view.setPoint("+ point.id +", \""+ pointComponent.id +"\", "+totalSec+" )'>"; 
}

}

</script>


<form name="form">
<select name="select1" onChange="checar()">
<option></option>
<option value="1">1</option>
<option value="0">...</option>
<option value="23">23</option>
</select>

<select name="select2" onChange="checar()">
<option></option>
<option value="1">1</option>
<option value="0">...</option>
<option value="59">59</option>
</select>
<input type="text" name="total" value="">
</form> 

Also make sure you have allowed an exception to the firewall.

What database are you using, Derby or MySQL?

As I recall Modbus only has an 8-bit address, so one master can only talk to 255 slaves via 1 port, so valid addresses are in the range 0..247 where 0 is used as a broadcast address.

However you can use another port, though.

If have any doubts about it I recommend you google for modbus documentation.

hmmm interesting, thank you craig for making it clear for us, actually english is my second language :)

Anyway, will M2M2 be open source?

I guess the answer is not and if so what will be the future of Mango M2M?

That's it, you are almost there.

Actually I think (not sure) you can use the unique ID as a graphical view ID, but if have not changed it should look like GV_123456.

Anyway, you can also find (and it works) the graphical view ID by acessing it from your Mango instance and looking at the URL of your browser. You'll see something like http://192.168.1.16:8080/mango/views.shtm?viewId=1

BR

I can't see enough developers to develop and maintain a open source mango.

Actually there is an existing fork, called ScadaBR, and I believe they are going fast and on the right way.

It's heavilly based on mango but has lot of other great features.