ModBus Communications Protocol

This one is mostly for Controls Engineers. Emerson Control Techniques manufactures Servo drives that communicate via the ModBus Protocol. This was and old GWBasic version of the protocol that I think I got from Taylor Software 10 years ago. I have adapted it for VB 6.0 (Win XP is my OS) using flexgrid to display the register contents. I also set this demo up to poll the physical I/O and velocity of an Emerson EN-208 Base drive. It can be adapted to communicate with any serial device that uses the ModBus Protocol.