I am a beginner-intermediate LV user and I want to read data from a mitutoyo digimatic indicator via a RS-232 to USB converter on to a laptop installed with LV 8.0. I am encountering problems finding the correct instrument drivers ( I have found one from Mitutoyo (mitmig4), but it seems like it's for intermediate hardware). I also want to read in data from a Chatillon Force Gage also via RS-232/USB converter. There seems to be no drivers for this and it looks like I may have to tinker with the existing LV 8.0 properties to recognize the force gage. My main questions are: how can I setup the input for the digimatic indicator with the correct drivers and what sort of VI's can I use to make my laptop recognize the Chatillon device? Thank you in advance.
Get the programming manual for these instruments and find out what are their RS232 command sets.
There are no VIs that will recognize a serial instrument. If the com ports are shown in MAX, then that is all that you need in order to start programming. I would suggest using a third-party terminal emulation program such a Hyperterminal, Procomm, etc before trying any LabVIEW code.
Some of these devices need a 'special' type of rs232 connection. I remember building a set of connector cables that needed a 10k pullup resistor and some handshaking lines hardwired.
Additionally the RTS line needed to be set to supply the open collector Tx of the gage .... wasn't well documented , they wanted to sell the adaptor
I attached my serial 'swiss army nife' I made to play around with serial ... It allow you to assert or unassert the control lines on the fly , however changing the serial parameters on the fly was never implemented...
If you have a working software portmon (a serial sniffer) is nice to see what the driver is doing.
For my Mitutoyo Linear Digimatic ID-H0530 I send it GA00\r, it replies with GN00,+0032.2545\r\n.
Like Dennis said, you can usually find the communication commands in the manual or the leaflet included with the instrument.