LabVIEW
Re: LabVIEW driver for Advanced Energy Cesar 0210 RF generator
@jason-cce wrote:
1.According to the TERMINAL_CAPTURE.jpg, the correct baud rate setting is 9600,n,8,1
2.If all the response is only one line with CR, you can enable the Termination Char and set the read count as many as possible.
3.If the response could be more than one line, maybe try to disable the Termination Char and use bytes at port and put a wait before the read.
4.A NAK response indicates an error in the command, maybe the command needs to add an extra parameter.
Your point 3 is bad advice. Bytes at Serial Port is almost never the correct answer, and in those cases where it is the correct answer, you deal with a device that is definitely to complex to handle for anyone without a few years of programming device communication under his or her black belt!
if it sends sometimes more than one line per command you still read one line a time but in a loop until you know the device is finished. With this device the message end indication seems to be either a solitary NAK or OK in the line!
That is 200% more reliable and easier to program than trying to do a response reading with Bytes at Serial Port.
The only situation where Bytes at Serial Port is sometimes useful in normal drivers is to check if there are already more than 0 bytes available, if so start reading the data WITHOUT using the value returned from Bytes at Serial Port, otherwise do other stuff and retry later on. This way your application can do useful things while it waits for the device to respond.
if you haven't done so yet, go watch Tim’s great presentation: VIWeek 2020/Proper way to communicate over serial
