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- Posts: 2
- Joined: Wed Sep 18, 2019 12:41 pm
This detector has 1 serial output (RS232) and one analogue output. Now the manual for the detector tells me that the RS232 serial outlet will send data back to my acquisition system but that's not the case! I'm using OpenLab ChemStation with an Agilent 1260. Interestingly, even though Chemstation says the detector is offline, I can send instructions to the ELSD and do things like change its temperature and turn it on/off, change the gas flow etc from the 'Instrument Method' screen in chemstation. So there obviously is some communication there, but it's only going one way - I can't get any signal back.
So, it looks like the manual is wrong. The RS232 does not send data, it only transmits instructions, and the readout comes from the 1V analogue output. I read somewhere I need an analogue to digital converter, so I hooked up the analogue output to a Perkin Elmer Nelson 900 box and I would hope that's converted the analogue signal to digital RS232 for me, but do I now I need to convert that signal to a LAN cable so that it can communicate with chemstation? Has anyone out there successfully managed to hook up an old analogue output ELSD to a new CDS??
Any help much much appreciated