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            Settings to verify before drip feeding

            In order to prevent missing data or a "Buffer Overflow" alarm on your CNC, verify that the following settings are adjusted prior to drip feeding using PC-DNC plus (all of these settings are found under CONFIGURE --> DNC WINDOWS --> ADVANCED unless otherwise noted):

            • Verify that the option labeled "RESET ON SAFETY TIMEOUT" is NOT checked.
            • Verify that the option labeled "HANDSHAKE USING DEVICE DRIVER" is checked.
            • If you are using Quatech brand serial hubs, you need to set the LOW LATENCY option if it is not already checked. To find this close PC-DNC plus, go to your Control Panel, select System, Hardware, Device Manager. Under Multi-Port serial adapters double-click on your serial hub, go to the SDS properties tab, then click the button for the Web Site Interface. Your web browser will open with the address of your serial device server. If a web browser other than Internet Explorer opens, copy the URL and paste it into Internet Explorer. The Quatech devices have known issues with other browsers which may cause corrupt configuration data. Once the site is open in Internet Explorer, go to the Serial Ports tab, select Port 1 on the box and then click LOW LATENCY. If there are other ports (such as on a 4 or 8 port box, click each of those other ports and then click LOW LATENCY. When done, click Save.
            • If you are using an internal COM port on your computer you may need to turn down the transmit FIFO buffer in the windows device manager. To find this close PC-DNC plus, go to your Control Panel, select System, Hardware, Device Manager. Under Ports open your COM port by double-clicking on it, go to Port Settings --> Advanced, and set the transmit (TX) buffer to it's lowest value (1). Click Ok. Baud rate / data bit / stop bit / parity / handshake settings in the device manager do not matter. They will be superseded by the PC-DNC plus settings.
            • We do not recommend drip feeding using a USB adapter if possible. If you must drip-feed using a USB adapter, be sure it is the Siig brand adapter. Most other adapters have experienced too many buffering problems in our experience to bother with. A majority of the USB adapters on the market use the same inferior chipset. If using the Siig brand adapter, you may need to turn down the TX buffer and latency settings to their lowest settings. To find this close PC-DNC plus, go to your Control Panel, select System, Hardware, Device Manager. Under Ports open your COM port by double-clicking on it, go to Port Settings --> Advanced, and set the transmit (TX) buffer to it's lowest value (64) and the latency setting to its lowest value (1). Click Ok. Baud rate / data bit / stop bit / parity / handshake settings in the device manager do not matter. They will be superseded by the PC-DNC plus settings.
            • If still having problems and using an internal COM port only, you may try the following
              • Disable the "Handshake using device driver" setting
              • Set the "Check handshake every x characters" setting to 1
              • (Test)
              • If still having problems, try increasing the block and character delays in increments of 1. A block delay will cause a pause at the end of every line. A character delay will slow down your transfer even more by delaying for each character. Because of this, drip-feeding with delays is not ideal and you may not have a machine which is practically capable of drip feeding if you have gotten to this point.
            Updated: 21 Jan 2014 06:22 AM
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