Hi Stephen, Thank you for the offer and if it's ok I'll certainly take you up on it.
Next week I'll be starting a new job so I won't be contributing for a while, However I'll try and get something up and running this week. If you are able to test it and/or take over the implementation from there it would be great. Ben On Tue, Aug 17, 2021 at 4:25 AM Stephen Snow <[email protected]> wrote: > I'd be more than willing to setup some equipment for a lab to test > with. Readily available to me are a couple of Omron CP1-H CPU's and a > Red Lion G3800C (which is outdated, but communicates with everything > ootb), plus I can easily get some Modicon stuff as well. The Omrons are > fitted with serial ports capable of communicating RS-485 in modbus RTU, > and the RLC HMI can talk Modbus TCP as well, so that is without laying > my hands on some Modicon equipment. > > Let me know, and I can start pretty much as soon as I clear space on my > lab bench for the setup. > > Stephen > > > On Mon, 2021-08-16 at 11:44 +0000, Christofer Dutz wrote: > > Hi Stephen, > > > > it's not that we're dropping anything ... it's just that we haven't > > put any work into creating such a driver. Some day, if someone > > stumbles over PLC4X with the need to use ASCII, we might implement it > > for them (Mabe as a paid-gig or not). > > > > In the inital days of PLC4X I invested a huge amount of time into > > thinking what the industry could need ... I switched to the way more > > healthy mode of implementing was is actually needed and when it's > > needed. > > > > But I agree ... Modbus TCP, Modbus RTU (over RS or TCP) are > > definitely flavors we should be supporting. > > > > Chris > > > > > > -----Ursprüngliche Nachricht----- > > Von: Stephen Snow <[email protected]> > > Gesendet: Montag, 16. August 2021 13:39 > > An: [email protected] > > Betreff: Re: Modbus RTU > > > > So I use modbus in all it's flavours, including modbusRTU and Modbus > > TCP. And the newer flavours Modicon is using now. Modbus RTU is > > definitely in heavy use on industrial equipment I encounter. It is > > commonly a drive networking choice, and a HMI networking choice. So, > > depending on what is using it ASCII is likely needed too. The one > > thing you don't want to do is drop ASCII. > > > > Regards, > > Stephen > > > > > > On Sun, 2021-08-15 at 23:48 +0200, Niclas Hedhman wrote: > > > On 2021-08-15 22:40, Łukasz Dywicki wrote: > > > > Then each driver flavor of modbus (rtu, ascii, tcp) would simply > > > > need to wrap and unwrap structures coming from an transport. > > > > > > seeing the ascii variant since the 1980s or early 1990s. IIUIC, it > > > was > > > mostly used for hand terminals, and not to connect to computers. > > > So I wouldn't spend time on that, unless nothing else is around. > > > > > > I haven't checked the mspec in details, but I suspect it is close > > > to > > > fair amount of equipment has extensions that are not in the > > > specification (well, at least last time I read it about 20 years > > > ago), > > > namely floating point numbers and 32/64-bit integers. It would be > > > neat > > > to support that... > > > > > > Unfortunately, I don't have cycles to help out with it. > > > > > > Cheers > > > Niclas > > > > > > >
