has any one worked with modbus on mini? can anybody giveme some ideas how can i do that?
is it possible work with modbus on mini?
clear that you can use modbus. modbus is only a communication protocol based on a series of rules that easily you find in the Web. besides the protocolic norm you have the electrical form that is RS485 like eletrical norm for intercommunicating between the diverse devices now, which you need is a convesor usb serial type ftdi232BM, and an interface tll, tll > rs485. p.e SN75176A are many but like these.
Andrés <> this Link has many interesting things http://www.modbus.pl/downloads.htm now any thing that you do you are going to have to carefully study the manual of the machine with which you want comunicate to know its internal registries and their directions etc etc… much work by the forehead!
Hello! If you work on WindowsCE environment, check: www.nmodbus.com I use it with VS 2008 and works fine! I used on RS232 starndard serial port, because my PLC slave modbus have RS232 connection too. Eugenio
If you decide to build your own TTL to 485 converter, be careful when using SN75176A under linux. Uart driver provided with Linux shipped with the device don't implement RTS pins, so you won't be able to use it to select TX and RX on the SN75176A. Been there done that !