dax021 Posted January 10 Share Posted January 10 (edited) Hi, I have a Must LP18-48100 battery (51.2V, 100Ah). Unfortunately I can't connect this to the comms port on my cheapy Axpert, so want to read the BMS info on my laptop using PBMSTools. I am not getting much help from Must re the pin configurations and was hoping someone here could help. I have an old LAN cable which I intend to chop off one of the RJ45 plugs and connect the required leads to a USB adapter. I have attached a picture of my adapter as well as the info I got from Must. Appreciate the feedback. RS485 Pin Outs.docx Edited January 10 by dax021 Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 10 Author Share Posted January 10 Sorry, my attachment popped up in the middle of the text. Don't know how to move it Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 10 Author Share Posted January 10 (edited) Let's try again. Edited the original Edited January 10 by dax021 Quote Link to comment Share on other sites More sharing options...
Kalahari Meerkat Posted January 10 Share Posted January 10 31 minutes ago, dax021 said: Let's try again. Edited the original I the .docx is accurate, then Pin 1 = B aka D- and Pin 2 is A aka D+, you could also use Pin 8 = B and Pin 7 = A from the RJ45 connector... Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 10 Author Share Posted January 10 Thanks, that's the way I saw it too. Just not sure if one can trust the Chinese interpretation. Worth a try, and hope it won't bugger anything up if they are wrong. Quote Link to comment Share on other sites More sharing options...
hilt_ctn Posted January 11 Share Posted January 11 (edited) https://kellerza.github.io/sunsynk/guide/wiring has a 2-pin example Edited January 11 by hilt_ctn Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 11 Author Share Posted January 11 Thanks for that. I bought that R38 two wire one and tried it out yesterday. Still no joy, but I think the problem is drivers, which I have now downloaded from the site you pointed me to. I will try later today Quote Link to comment Share on other sites More sharing options...
jumper Posted January 12 Share Posted January 12 20 hours ago, dax021 said: Thanks for that. I bought that R38 two wire one and tried it out yesterday. Still no joy, but I think the problem is drivers, which I have now downloaded from the site you pointed me to. I will try later today FYI I had a lot of trouble with drivers on one of these adapters because the site I bought it from said it was a CH340 chip, but it turned out to be FTDI. I finally sorted it by uninstalling the adapter in device manager and manually deleting all related driver files (write them down before uninstalling the adapter). I then restarted the PC, plugged the adapter in and windows installed the correct drivers. I have managed to connect to the seplos bms in my battery with the seplos software, with the same pinouts as you and the adapter works perfectly, but I am not able to connect with PBMSTools, so you may need to find out exactly what bms you have and if there is a specific software for it. Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 12 Author Share Posted January 12 Thanks, I seem to have the same problem. Installed the CH340 driver, but still not getting any info. Must Batteries say that PBMSTools is the correct software, but I am inclined to not believe much that they say. They have given me so much conflicting info that I have pretty much given up on them. I will carry on reading this thread and playing and will hopefully hit on the solution one of these fine days. Quote Link to comment Share on other sites More sharing options...
TheMac Posted January 12 Share Posted January 12 @dax021 Are there settings like baud rate, parity, rts, etc involved in this setup? What do you have your setup as? Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 13 Author Share Posted January 13 I can change the baud rate and have tried all through 4800 - 115000. Not sure about the other settings. Must are now telling me that I can't communicate with the battery via RS485, that this is for paralleling only, I must use RS232 which is a RJ11 plug Quote Link to comment Share on other sites More sharing options...
jumper Posted January 14 Share Posted January 14 5 hours ago, dax021 said: I must use RS232 which is a RJ11 plug I think you will have more luck with this as I have only seen pbmstools work with rs232, I've not seen it run over rs485. Chris Louw 1 Quote Link to comment Share on other sites More sharing options...
Chris Louw Posted January 14 Share Posted January 14 6 hours ago, dax021 said: I can change the baud rate and have tried all through 4800 - 115000. Not sure about the other settings. Must are now telling me that I can't communicate with the battery via RS485, that this is for paralleling only, I must use RS232 which is a RJ11 plug Baud rate for pbmstools is 9600 Quote Link to comment Share on other sites More sharing options...
dax021 Posted January 14 Author Share Posted January 14 Ja, I thought that too and have it set on 9600 at the moment. I think my next move is to get hold of a RS232 (RJ11) to USB cable and try that. This has been quite a learning curve for me, and I thank everyone who responded Quote Link to comment Share on other sites More sharing options...
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