problem in serial communication using MODBUS


Thread Starter


hi to all members,

well i am a student and new to this field so sorry if i say something wrong. the problem that i am facing is I am having a mini2440 (samsung motherboard) ARM9 development board (running WinCE 5.0 O.S.) which is acting as Master in communication while my another machine is VLT FC51 acting as slave.

I've written a code in vb .net2005 for ARM 9 board for serial comm using MODBUS protocol. now my board is communicating with MODBUS simulator which is giving proper response for query. but when i am trying to communicate the VLT drive n board then there is no response from the VLT drive. i can't figure out what or where the problem is?? can some1 plz guide me through...

thanks in advance.