Download Ramps usb driver from http://www.makrtoolbox.com/forum/discussion/3/ramps14usbdriver#latest
1 Connecting RAMPS 1.4 Hardware & Driver Installation Windows 7 / Vista 10.1.3 Arduino Driver – Windows 7 & Windows Vista Installation
Step 1 After connecting the USB Cable to the Computer either a “Found New Hardware Wizard” Dialogue window will appear, or a dialogue box as below, either way just close the respective window.
Step 2 Navigate to the Windows Control Panel and Select “System” and then select “Device Manager” on the top left hand side. You should then be able to see an “unknown device” under “other devices”
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Step 3 Right click over the “unknown device” and select “properties”.
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Step 4 Select “Update Driver”.
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Step 5 Select “Browse my computer for driver software”.
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Step 6 Select “Browse”.
Step 7 Select “Ports (COM & LPT)”.
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Step 8 Select “Have Disk”.
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Step 9 Select “Browse”.
Step 10 Navigate to Where you located the “Arduino 1.0” folder, then go into the “drivers” folder and then select “Arduino MEGA 2560 REV3.inf” and click “Open”
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Step 11 Select “Ok”.
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Step 12 Select “Arduino Mega 2560 R3” then select “Next”.
Step 13 Select “Install this driver software anyway”.
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Step 14 After a short while (it could be up to a few minutes depending on your computer speed) the following message should appear, then select “Close”.
We can now proceed to Win 7 Port Speed Settings Win 7 Port Settings
10.0 Computer Setup Back to top
10.1 Connecting Hardware & Driver Installation
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10.1.3.1 Setting Port Speed – Windows 7 / Vista We now need to set the correct port speed for the new serial port we have just created by installing the Arduino driver in the previous section. Step 1 Navigate to the Windows Control Panel and select “System” and then select device manager from the top left hand side.
Step 2 Navigate to “Ports (COM & LPT) and expand by selecting the triangle/arrow to the left of it, then right click over “Arduino Mega 2560 R3 (COM?)” and select “Properties”
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Step 3 Make a note of the COM port your computer has allocated to the Arduino Serial Port, in the title “COM”, you will need this later when setting up your printer software. Now select “Port Settings”
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Step 4 Select the “Bits per second” drop down menu and select “115200”, then select “Ok”
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Step 5 Select “Ok”, now we have set the port speed.