Yeah, RS-232 can be challenging at times. I think the most time consuming part is reading through each manufacturer's specs of how they employed it and trying to digest it. I have seen RS-232 docs from some manufacturer's that were 30 pages!! Talk about a lot of unecessary info sometimes.

In almost every case you will need an ending command, usually a Carriage Return such as CR or \r or /r

NSP3 will let you put that in, in a variety of ways, once you figure out what each manufacturer wants.

In many case you also need an opening bit or two like * or / or whatever the manufacturer says they are using to open the communication.

Dave
RemoteQuest.com