04-17-2014 04:08 PM
04-17-2014 04:15 PM - edited 04-17-2014 04:24 PM
Did any kind of user manual come with this USB hardware, paper or PDF? And if so, does it do more than just tell you how to install the drivers? Or did any kind of other application (self test, configuration, etc) get installed along with the driver?
How can the driver have no understanding of 485 wire modes? I don't have any answer for that, other than to suggest that the driver is not correct for the hardware, or didn't install correctly. If I were you I'd be looking for updated Prolific USB serial drivers that might support the 485 interface more properly.
No, cancel that, I'd be ordering an NI USB-48/1 to replace the Prolific.
Dave
EDIT: I totally missed that you'd included the manual in a prior post! I apologize. It isn't a very extensive document, but when I look at the pinout they show, it's clear to me they are already supporting ONLY two-wire mode electrically. So their driver MUST be set to toggle the transmitter on/off.
So, what wiring did you actually change in your earlier post? And, have you tried reversing plus and minus as a last resort?
04-18-2014 03:46 PM
i have updated profilic driver.....
wi am unable to find NI USB-48/1 as u suggested.....wher would i get it??
i exchanged plus minus terminals also...
i have installed ni serial drivers (niser340).
04-18-2014 03:54 PM
04-24-2014 05:30 AM - edited 04-24-2014 05:35 AM
yes i have installed ni-MAX and visa...
i have chanaged the energy meter (SATEC PM130EH PLUS) . now i am able see the parameters in labview.
currently we are aquiring voltage reading bt we have to show these readings with the meter timing when they were taken....
can you suggest us how to synchronize timing of pc (labview) and energy meter so that we can show the readings with energy meter time.
can you send any vi.
09-17-2014 11:29 AM
I'm using an Acuvim CL-D-60 via RS-485. What I found that was an issue is the labelled A and B lines were WRONG...
When I reversed the A + B communication lines into the meter, the RS-485 comms started working properly.
I'm using the B&B Electronics Model 485SD9TB converter (RS-232 to RS-485) .
I've used this with MANY RS-485 devices and
every now and then, a specific instrument model will require the swapping of the A+B connections.
05-03-2019 03:29 AM
Use this VI,
Modify the register Address if required