Modbus Viewer description

1. Serial App.
Support chip PL2303. While only for writing. Reading not available(maybe I'll add reading in next version).

2. Modbus tcp/ip App.
Application allow to retrieve data from devices through protocol modbus tcp/ip. A scanner makes it easy to find relevant addresses.

Support functions:
- 01 Coil status (0x)
- 02 Input status (1x)
- 03 Holding registers (4x)
- 04 Input registers (3x)
- 05 Write single coil
- 06 Write single register(type -32000...32000)
- 15 Write multiple coils
- 16 Write multiple registers(type -32000...32000)
- My request

Please, contact me if you find some bugs.