thanx for replyin.
i've already tried using bytes at serial port vi. but the number of bytes at serial port is zero. i even tried settin timeout to 5sec, still zero bytes at serial port. In visa config serial port vi my settings are 1200 baud, 1 stop bit, 8 bits, odd parity. also i'm able to write to the instrument i.e., when i send some command to change a parameter, i'm able to see the change in the display of the monitor. What should be the time delay between the command send by the master and time for the slave to reply.
waitin for ur valueble suggestions & ideas