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Topics - secarica

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In a network environment with several SBC65EC boards, I would like to have the page title on each with their NETBIOS name, so when one loads a page it should see at once which board is which.

The proper place is the title page in master frame ("Modtronix SBC65EC Web Server" or "Modtronix SBC65EC Web Server Configuration", the one written on yellow background, in index.htm or xcfg.htm files respectively; this should display something like "NETBIOS - Modtronix SBC65EC Web Server" or "NETBIOS - Modtronix SBC65EC Web Server Configuration" respectively, where NETBIOS is the name as set in Network Settings page).

The NETBIOS name, editable, appears to be displayed in the page generated by xncfg.cgi based on a javascript script but the editable feature is not required in a title.

Is there a way to achieve this ? The title is in <head>...</head> portion and I don't know if a javascript can take action there.


Thank you,

I am using a SBC65EC assembly, mounted into a metal enclosure. All internal circuits must be isolated from the metal housing, which is earthed. This is easy to be done with my other circuits and power supply, but unfortunately the SBC has the RJ-45 connector shield connected to the electrical ground and the shield is very close to the enclosure cutout, so they may have electrical contact.

I can hack the printed circuit board with a milling machine and isolate the printed circuit that goes to the RJ shield, but it is somewhat difficult, I have to unsolder the RJ connector first and the cosmetic result to the SBC board is catastrophic.

I can make the enclosure cutout a bit larger, but is looks ugly. My question is if there is somewhere a thin plastic frame, or gasket, or something, designed specifically for RJ-45 connectors, which should just surround the connector and "press and fit" in the case cutout.

Thank you,

I know that the serial number when connecting to the serial interface is used for the last two numbers of the MAC address. Ok, but what is the exact equivalence ?

The numbers entered in serial have to be hex ? Decimal ?
How to specify the first pair (or number, if decimal) and how to specify the second pair (or number, if decimal) ?

Cannot check right now for myself and I have to write some instructions on this and don't know what to write actually. On the last test I made I entered 1234 or 12345 (cannot remember exactly) and the last two MAC values in web interface were 226 and 64.

Thank you,

Suppose I build a device based on SBC65EC, where the end user will change the default username or password and then forget it. How can the user force a password change or reset ?

Resetting the board does not seem to reset the username or password. Command ?la=new_string will require authentication with the old username and password, so this must be known. The serial interface does not offer this option either.

I know how to change directly the EEPROM string data with my PICKit 2 adapter, but this is not an option for an end user.

Any solution for this ?


Serial LCD Displays / how can the display board be programmed ?
« on: May 15, 2012, 10:36:26 PM »
I have a PICKit (2) with which I can program the SBC65EC board, or just read or modify directly the EEPROM, via ICP connector.

But I don't understand how can I do the same to the LCD2S board. I should compile some program for the SBC board that in turn will run and write the desired content to the LCD board ? Or what else ?


I have a LCD3SR1 serial display module, which is connected to a SBC65EC board with a Modtronix-build cable. The serial display has connected a DEM 16226 SYH-LY display module. Two jumpers on the display module had to be changed in order to reverse the backlight polarity.

My problem is that the display does not show anything, except for the backlight. Even ignoring any character display programming, it seems to me that the LCD3SR1 does not receive any data from SBC65EC, because the backlight is always the same regardless the value I enter in the web page configuration.

I changed the two DIP switches in all four combination, no difference in either mode. Here seems to be a problem, because:
- in the LCD3SR1 documentation it is written that for I2C mode the switches should be 11 (chapter 5)
- in the SBC web page it is written that for I2C mode on LCD2S the switches should be 00; does this apply the same to LCD3S ?
- on the serial display board it is written with white ink that I2C-0 is 00

Either way I don't know where to start. Any similar experience sometime in the past ?

Thank you,

I know that the IP address and DHCP status can be changed via serial port (at least this is the case for SBC65EC). Is it possible to use the USB port for configuration ? Is there already a PC application that can handle the USB port of SBC66EC ?



Update June 2012
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A face plate like this one which was build with SBC65EC board in mind is well suitable for SBC66EC board as well ? (ignoring the USB connector)

In other words, the (active) header connectors, RJ45 connector, LED status and power supply connector are on exactly the same positions on all SBC6x boards ?

Thank you,

I have a PT24E prototype board with enclosure. Recently I purchased this header connector from Modtronix with the idea to use it on my own designed board, in the same enclosure.

Problem: the new connector pair is higher than the one from PT24E and so the top case cannot fit the bottom case because the SBC module remains too high mounted.

On the PT24E board, the second plastic spacer is very close to the first one.
On the new connector, the second plastic spacer is almost 3mm away from the first one. I tried to lower the second plastic spacer, but the SBC board still remains on top of the pins, because the female connector has limited depth.

What header connector is the one used on PT24E board ? Where from can be purchased so no further invention should be required ?


Serial LCD Displays / IP address displayed ?
« on: November 27, 2009, 10:46:21 AM »
Is it possible to display the IP address on the LCD ?
This should cover both manual and DHCP situations.
Perhaps on the second row the DHCP status may be useful to be displayed too (something like DHCP: ON or OFF).

Thank you,

Ethernet Boards (8-bit) / where from is this plastic spacer available ?
« on: November 26, 2009, 01:42:20 PM »
In this picture here the board is mounted on that plastic spacers.

Are these available from Modtronix, or should I search elsewhere ? What dimension ? Usual metal spacers lengths available with easy for me are 5mm, 8mm, 10mm, 15mm, 20mm, etc., whereas the space required on PT24E board appears to be 16mm.


Ethernet Boards (8-bit) / isolation of ethernet line
« on: October 09, 2009, 03:18:42 AM »
I need to isolate the Ethernet line (and the RJ shield form the circuit ground as well). I assume I have to build an additional circuit board with a (100baseT) Ethernet transformer on it and move the RJ connector & LEDs on that board.

What transformer is recommended for this purpose ? (something that matches the Realtek circuit).

I can buy from Farnell, or eventually RS Components. Some suggestion ?

Thank you,

I noticed that the SBC65EC is marked "out of stock". Is this something temporary ?


Ethernet Boards (8-bit) / weird DHCP behaviour
« on: October 25, 2007, 07:08:03 AM »
I have a SBC65EC board connected to a Linksys WRT54GL router. The router is set to use DHCP. On the same network there are a few other WinXP machines, wireless and/or wired connected.

The SBC65EC board works fine only in some circumstances:
- it works ok if I first power the board, then connect the network cable after a few seconds delay (10 or more seconds)
- it does not work ok if the network connection is set before the board is powered up; in this case, the Modtronix board does not exists on LAN (the DHCP table does not assign/show it)

Is this a known behaviour ?

Other than this, another strange thing is that when the board is working ok, the network name is not shown in the router DHCP clients, I mean the position exists, the address is assigned ok, but the name is blank. However, at the same time the board web's page can be successfully loaded by typing htp://mxboard in browsers on local machines.

Hm ?


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