We noticed that you emailed us this question as well as posting it here. In the future, please let us know if you decide to ask a question through both the forum and email. I have copied my reply below in case anyone else has a similar question:
Unfortunately, we do not have any example code for communicating with that controller using Visual Basic. However, instead of the Serial 8-Servo Controller, I would recommend using one of our Maestro USB Servo Controllers.
The Maestro is newer and better than the serial servo controllers in almost every way, and you might find this forum thread on using the Maestro with VB6 useful.
If you do decide to use the serial servo controller, you can find documentation on all of its serial commands in its user's guide, which is located under the Resources tab of its product page.
The Resources tab also has a link to a tutorial on using the controller with C#. In addition, if you search online for something like "vb6 serial port" you should be able to find sample code for sending bytes to a serial port, which you could use with the controller.