![]() It would be a good test to prove your PC/Cable/driver settings by checking with another DF1 PLC just to make sure you don't have a hardware or software problem. File name: qvsserialtousb.exe Version: 1.4.6 File size: 6. The DH485 cable Mark sells is excellent too. Below you can download qvs serial to usb driver for Windows. I have RS232/USB cables from, and RSLinx Autoconfigure has always worked when the device at the other end is set for DF1 Full Duplex. In my field (water and wastewater), we see a lot of the other protocols used for radio telemetry purposes. This is rarely used, so most likely just a distraction from your trouble, but still among the list of possibilities.ĭH485 is probably the most common alternative in general use. I say probably, because with ASCII mode (user tab), there is a way to programmatically switch modes back to System. If it is set for Modbus RTU, ASCII, or Shutdown, you are probably not getting in through that port. If it is DH485, DF1 Half Duplex, or DF1 Radio Modem, then you still stand a chance. There are several protocols it could be that can either prevent access by RSLogix or make it tricky. ![]() If you don't have one forum member GeniusInTraining sells them. 3) With Free version: Click the Update button next to the flagged USB to Serial driver to automatically download and install the correct version of this driver. Driver Easy will then scan your computer and detect any problem drivers. ![]() I remember the first time I hit that bug. 2) Run Driver Easy and click Scan Now button. The DB-9 port may be set up for DH+ comm's not RS-232.
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