LabVIEW
how can I send AT commands by the serial port when the VISA VI's don't work?
I tried my invisible ink remover but that didn't work 
, so it looks like you need to reply to your post with the description of the problem, as it didn't make it through.
, so it looks like you need to reply to your post with the description of the problem, as it didn't make it through.
If his VISA installation is as present as his effort to explain his problem I do not wonder why it doesn't work.
@smercurio_fc wrote:
I tried my invisible ink remover but that didn't work
Rolf Kalbermatter
Ok lets start from beginning. YOu have verified that VISA is properly installed by checking in the Measurement & Automation Explorer that your serial port is properly recognized? In there you can also do some communication similar to what you can do in Hyperterminal.
@jose Pablo wrote:I am using an adapter of RS-232 to Bluetooth, this adapter is setup using AT commands by the serial port, if I use the hyperterminal of Windows I do not have problems to do it, but when trying to do it with the VÍs of visa in LABVIEW I do not have answer.
Now about serial communication in general. Every serial device needs to know if a command it receives is finished or if it should wait for more parameters/characters etc. This is done with a termination character that has to be appended to every command. Most often this termination character is a carriage return, a line feed or a combination of these two.
Hyperterminal happens to send the carriage return and/or line feed character that results from hitting the return key to finish your command entry. LabVIEW sends out EXACTLY the characters you tell it to send. So in LabVIEW to get a carriage return or line feed or both send to the device you have to append them explicitedly to the string you send out. And NO having LabVIEW append those characters automatically is no good option since quite a lot of devices in test and measurement do not work all the same and having LabVIEW do this would make communication with those devices impossible.
You can either use the string constants from the string palette and append them to the string with the Build String node or you can enter those characters directly in a LabVIEW string control or constant by first selecting the control or constant pop-up menu and in there selecting '\' Codes Display. Then you can enter \r for carriage return and \n for line feed.
Rolf Kalbermatter
Message Edited by rolfk on 04-12-2006 10:15 PM
Ok, I am going to try again adding these characters in the VISA VI's. thanks for your help.
