I am using SRP-770II and the printing speed is too slow. How can I increase it?

1. The printing speed of SRP-770II is 4ips (100mm/s).
2. If the printing speed is slow, you can adjust it only when you use Serial communication.
3. You can adjust the printing speed of the printer by changing serial communication settings using Dip S/W
4. DIP switch settings of SRP-770II are as follows.