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Good day All,

Given the comments presented, I am thinking that I may need to expand the capabilities of one of the devices I created for a customer to include additional weather station...

Good day richdee23,

Unless CC has create a new product and/or added some very specific JCI field bus functionality to their routers that I am unaware of, this will not work in any way. JCI's N2...

Good day Jer,

You are most welcome. Orion242's post is also a good one. As Orion stated...if possible, disconnect the powered off devices and see if your network returns. Also, not all RS485...

Good day Jer,

I would say in most cases the answer to your question is yes. That said the input impedance/load will depend upon the RS485 transceiver's internal design, but most include some...

Good day integrator

Just a few out of the box thoughts:

a. Have you tried a different CT in case the one you are using is defective?

b. Have you wired the CT's output to a different...

Good day orion242,

How dare you actually consider details... It is the new tech, we all should jump in and follow those in the know :)



I cannot speak for others, but I have a warehouse full...

Good day orion242,

Understood. Even so, this has issues and limitations similar to standard Ethernet. That is not to say it is a show stopper, but that there is a price to pay for having two...

Good day orion242,

When I looked at playing with SPE, I found overall support for the tech a bit spotty and so wide or committed adoption is simply not there. I do not doubt that there will be...

Good day Orion242,

Here is a post I did last year that somewhat summarizes the related standards, which may be of interest



Cheers,

Sam

Good day numbawunfela,

Your comment of "I didn't know that there is often an internal 100 Ohm resistor between the RS485 interface and a controllers 24v reference." is incorrect. The 100 ohm...

Good day numbawunfela,

As mentioned, there is no "right" or "wrong" way of powering gear...there are pros and cons to both approaches in terms of having a power supply input grounded or isolated. ...

Good day control$,

I appear to be unable to explain my point... it has nothing to do with reliability and troubleshooting ... nor is it more or less correct to ground or to isolated the 24VAC...

Good day numbawunfela,

There is really no right or wrong ... except where only one wire powers equipment and relies upon a "common" ground connection as the current's return path. I cannot see...

Good day control$,

I think you missed the point I was trying to make in that understanding the "why" is very important and to not simply doing something because of what was done before or what is...

Good day control$,

Understood. I have been designing commercial and Industrial embedded systems (including sub-surface for oil/gas) for over 30 years and not one of my designs relied upon the...

Good day JCIman,

Of all the JCI gear I have reviewed, it was not the 24VAC powering of the equipment that was a critical factor for RS485 communication, but that JCI designed virtually all of...

Good day control$,

Indeed, it is always best to consult the equipment manufacturers documents, but there are times where they are not available (older equipment, or manufacturer no longer around,...

Good day Integrator,

I believe that it will depend upon the application, the secondary voltage, and the power involved. For example, the (Canadian) lighting industry routinely uses 347V to 24VAC...

Good day Orion242,

Thanks for the info and update. Indeed, newer devices look to have improved things, but one should check rebranded ones to confirm. That said, I am not sure that having a 1M...

Good day jschulze,

In my experience JACEs, FX's, etc are not always isolated. It depends on the model and/or who has rebranded the device and whether the bus is connected to the on-board RS485...

Good day Orion242,

Agreed. I have yet to see any inspector that has actually checked and certified a site that it is in full compliance of various Energy codes. When I asked the inspectors that...

Good day numbawunfela,

Understood. The GE "style" of lighting relays may look odd, but are actually not that bad all things considered. They mount via a hole/knockout where one side is the LV...

Good day orion242,

Agreed. Conceptually what is needed is not that complicated. I always find it amusing when I review various energy code requirements... and find that no one considers that the...

Good day All,

Sadly, virtually all the main stream lighting manufacturers use proprietary communications/protocols between their various components in order to maintain control (no pun intended)...

Good day PHM,

Understood. The relay coil is simply a wire and so there is not a lot that can fail on it as long as the coil wire itself is suitably manufactured. Consequently, no real concern...

Good day PHM,

If the contactor is sized appropriately and is a quality brand product, then I think you will not have an issue. Contactor/Relays see their greatest electrical stresses when...

Good day numbawunfela,

The one site I went to was done very "creatively" to control a GE relay based system... It used multiple JCI DX9100 with a lot of I/O expanders and secondary relays. ...

Good day numbawunfela,

For direct lighting relay control, I would suggest going with the GE RR9 or equivalent (many vendors offer similar relays in the same form factor), as tickling these is very...

Good day orion242,

You are not wrong. For some reason, there are very few Dali options on this side of the pond and even less firms that truly know Dali. The end result is a major black eye for...

Good day numbawunfela,

I was thinking... since there are others that really want to go with a BMS controller solution, why not have the customer considering replacing the fixtures with 0-10V or...

Good day numbawunfela,

Understood. I am the "king" of over thinking things and so I try and provide some guidance when I can... so as to save others some time and head bashing.

No worries...

Good day numbawunfela,

Not true. Douglas controlled distribution in North America and so when Douglas folded, the North American supply chain was significantly affected. Many firms simply bought...

Good day numbawunfela,

There are a variety of things that can be done, as switching lighting loads is not that complicated. However, there are other factors that may or may not be an issue or...

Good day numbawunfela,

Leviton and the like tend to offer commodity based products and so if the sales volumes are not there and sustained, these firms have no issues with punting their products....

Good day numbawunfela,

This a reasonable overview on this issue that sidesteps some theory that would have been helpful. Without going too much into the weeds, Capacitors behave like a short...

Good day JCIMan,

I thought AB only made lighting contactors? If so, then these would be really overkill for smaller applications... but I can certainly be wrong on this.

Cheers,

Sam

Good day numbawunfela,

In my area Panasonic/Douglas and GE are by far the most common. Since these lighting relays tend to last a long time they are not changed out too much, which makes the...

Good day Gentlemen,

Firstly, Panasonic relays are still very hard to get, as Douglas Lighting had exclusive distributorship for these relays. Although Douglas is no longer in Biz, it is not...

Good day numbawunfela,

I would suggest you use relays that are designed for lighting loads, as there are many inherent design features that standard relays do not have. Secondly, lighting relays...

Good day Bill,

Thanks for the shout out!

With regards to the System91 protocol I also heard that it originated out of Europe and was used in the DX devices and sub-components. I believe that...

Good day Markus,

As SteveS4 mentioned, the overall protocol complexity as used by these devices is far and above that used on "regular" N2 devices. "Regular" N2 device communication is via a more...

Good day numbawunfela,

Just trying to help, share knowledge, and to correct any misunderstandings that others may have.

Cheers,

Sam

Good day All,

Just to clarify a few things...



I understand what the poster meant, but as it was worded, it is incorrect. MS/TP is a communication protocol that uses RS-485 as a...

Good day dschiffer,

You are most welcome. If you wish more lower level detailed info on RS485, etc then search my older posts, I have posted a lot of info on RS485 that may be of interest. ...

Good day dschiffer,

At the component level you can use devices offered by Texas Instruments (e.g. ISO77410), Analog Devices (ADM2587, etc), NVE (eg. IL 3185E), Murata, etc. Some use optical...

Good day stomachbuzz,

The RS-485 (EIA-485) does not require a shield. In fact a shield can actually make things worse, as it can add capacitive effects (e.g. filtering, reducing the signal slew...

Good day Mikemikemike,

You could consider a PC, but there are a number of items you may want to be mindful of:

1. Most PCs are targeted towards to the Consumer market and so their design,...

Good day noskilltechch,

This is not what I as eluding to. Depending upon the device's full functionality it could be straightforward to simply write one's own version and load it into very...

Good day techguy802,

There is very little low-level tech information available on any of the Douglas devices and especially their Dialog system. In fact I have been working with Douglas device's...

Good day All,

This is not an uncommon practice, as support costs can be significant... and solid manufacturers considers such costs... however, some do not :( and anything for a buck I guess.
...