To send multiple operation commands to serial port

[Ermani]

My AC power source is able to communicate to PC via serial port using LABView and I can perform any operation by giving commands in Hex individually, But when it comes to the parallel operation of all the commands or to put them in a particular sequence. I am failing to do so.

[Ermani]

For example I want to Reset the Instrument, set the Voltage, Frequency and then set the Output etc. or all these functions at the same time with various controls. So I want to know how all these commands can be sent throgh one input only.

[crossrulz]

You can only send 1 command at a time.  That is just bus communications 101.  But you can string together many VISA Writes to send the individual commands, one after the other.

But since if sounds like you are doing this on a GUI based instance, what you want to do is configure the port before your loop and close the port after the loop.  Then inside your loop you just have an Event Structure to key off of the different controls changing values.  You just send the command you need to inside of each event case.