Please use the configuration manual on the CD or use this link to the online manual.

With the manual up, under Setup, select Changing Adapter Properties. Follow steps 1 through 4. At step 5 you can select a port, properties, and the "Complete Write When Sent" option is enabled or disabled here. Please note that this is a "per port" option, so it is enabled or disabled port by port or by checking the box "Copy these settings to all ports". If you using the port with a printer, with a faxing application, or if you encounter other application difficulties, it is highly recommended that you enable this option.

To enable the Low Latency option, follow the instructions above to get to step 5. At step 5 select the adapter, properties. The "Low Latency" option may be enabled or disabled via the check box.

For many applications it is often best to enable both the "Low Latency" and the "Complete Write When Sent" options.

After closing the Device Manager, wait 30-60 seconds (or longer if you have many ports) before the the changes take place. Stopping and restarting the application using the ports may be required. In rare instances, rebooting the system may be required for the changes to take effect.  

Related Information: