RS-485 Pinout to RJ45

[mpm]

Is there a standard (or at least, recommended) pinout for an RS-485 network to an 8-pin RJ45 style jack?

I Googled it and it seems to very wildly by manufacturer and/or product.

I have to layout a board for a product that will sit on an RS-485 half-duplex network with up to 15 nodes.

Appreciate the help!

 

On Sun, 18 Aug 2019 07:22:53 -0700 (PDT), mpm <mpmillard@aol.com>
wrote:

>Is there a standard (or at least, recommended) pinout for an RS-485 network to an 8-pin RJ45 style jack?

There are no standard. Just select one of the four pairs.

When looking for various notation for devices from different
manufacturers, they may interpret the polarity differently. If one
manufacturer uses D+/D- notation, an other manufacturer will have the
opposite polarity. Only the official standard A/B notation seems to be
OK with all manufacturers, so use it in your documentation (not
D+/D-).

I Googled it and it seems to very wildly by manufacturer and/or product.

I have to layout a board for a product that will sit on an RS-485 half-duplex network with up to 15 nodes.

You may (or may not) need a signal ground, so you may have to use an
other pair for this.

Appreciate the help!

 

On Sun, 18 Aug 2019 07:22:53 -0700 (PDT), mpm <mpmillard@aol.com>
wrote:

Is there a standard (or at least, recommended) pinout for an RS-485 network to an 8-pin RJ45 style jack?

I Googled it and it seems to very wildly by manufacturer and/or product.

I have to layout a board for a product that will sit on an RS-485 half-duplex network with up to 15 nodes.

Appreciate the help!

I'd at least use the Ethernet pairing, so you can use standard cables.

 

[Lasse Langwadt Christense]

søndag den 18. august 2019 kl. 18.33.43 UTC+2 skrev jla...@highlandsniptechnology.com:

On Sun, 18 Aug 2019 07:22:53 -0700 (PDT), mpm <mpmillard@aol.com
wrote:

Is there a standard (or at least, recommended) pinout for an RS-485 network to an 8-pin RJ45 style jack?

I Googled it and it seems to very wildly by manufacturer and/or product.

I have to layout a board for a product that will sit on an RS-485 half-duplex network with up to 15 nodes.

Appreciate the help!

I'd at least use the Ethernet pairing, so you can use standard cables.

also reduces the risk of frying it is plugged into a POE ethernet

 

[whit3rd]

On Sunday, August 18, 2019 at 9:33:43 AM UTC-7, jla...@highlandsniptechnology.com wrote:

On Sun, 18 Aug 2019 07:22:53 -0700 (PDT), mpm <mpmillard@aol.com
wrote:

Is there a standard (or at least, recommended) pinout for an RS-485 network to an 8-pin RJ45 style jack?

I'd at least use the Ethernet pairing, so you can use standard cables.

Preferably (because some old cables from pre-gigabit may still be useful) use positions 1,2 or
positions 3,6 (the orange/orange-white or the green/green-white pairs).

 

[Adrian Caspersz]

On 18/08/2019 15:22, mpm wrote:

Is there a standard (or at least, recommended) pinout for an RS-485 network to an 8-pin RJ45 style jack?

I Googled it and it seems to very wildly by manufacturer and/or product.

I have to layout a board for a product that will sit on an RS-485 half-duplex network with up to 15 nodes.

Appreciate the help!

Cisco console lead?

--
Adrian C

 

[Adrian Caspersz]

On 19/08/2019 00:39, Adrian Caspersz wrote:

On 18/08/2019 15:22, mpm wrote:
Is there a standard (or at least, recommended) pinout for an RS-485
network to an 8-pin RJ45 style jack?

I Googled it and it seems to very wildly by manufacturer and/or product.

I have to layout a board for a product that will sit on an RS-485
half-duplex network with up to 15 nodes.

Appreciate the help!


Cisco console lead?

oh, ignore that. Differential ....

--
Adrian C

 

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in news:eb63850e-
4741-429f-9312-2bca568076d3@googlegroups.com:

also reduces the risk of frying it is plugged into a POE ethernet

They are pretty smart and would likely not energize the port.

Every POE I saw was a managed port that was energized only through
software, but once energized, I suppose one could plug a cable into a
"turned on" port. But I think they have load sensing too, and would
shut the P part off. Likely shut it of for failing to handshake ENET
too.

If you are making your own link, you could use a ten pin wide
connector. That would keep anyone from inserting it into an ENET
port. That would be RJ-50. Crimpers or the die might be more
difficult to find.

 

[Jasen Betts]

On 2019-08-19, DecadentLinuxUserNumeroUno@decadence.org <DecadentLinuxUserNumeroUno@decadence.org> wrote:

If you are making your own link, you could use a ten pin wide
connector. That would keep anyone from inserting it into an ENET
port.

No, it would not. 8P8C is the same width as 10P10C.





--
When I tried casting out nines I made a hash of it.

 

Jasen Betts <jasen@xnet.co.nz> wrote in
news:qjdqtr$n32$1@gonzo.revmaps.no-ip.org:

On 2019-08-19, DecadentLinuxUserNumeroUno@decadence.org
DecadentLinuxUserNumeroUno@decadence.org> wrote:

If you are making your own link, you could use a ten pin wide
connector. That would keep anyone from inserting it into an ENET
port.

No, it would not. 8P8C is the same width as 10P10C.

Sure it would. Even though they are the same width, the 10p can be
bought with a key on it.

But they are chosen just for this purpose and some others...

quote:
The 10P10C connector is commonly referred to as an RJ50 connector,
although this was never a standard registered jack in the Universal
Service Order Codes. The 10P10C has 10 contact positions and 10
contacts.

The most common uses of the 10P10C connector are in proprietary data
transfer systems, such as the Digiboard and Equinox Super-Serial
multi-port TIA-232 adapters 10P10C connectors are also used to
implement RS-485 interfaces, and for data link connections in APC and
Eaton uninterruptible power supplies. In the latter case, a keyed
10P10C plug with a protrusion on the pin 1 side near the back is
used.

This connector is also used by some vendors, for example, Cyclades
(later absorbed by Equinox) used pin 1 as an "RI" (ring indicator)
signal, which is seldom used, allowing an 8P8C plug to be inserted to
their 10P10C socket for most applications. The Cisco Systems STS-10X
terminal server features this connector. FordNet, a five-pair
communications networking medium, also used the 10P10C between
terminals.

 

[Lasse Langwadt Christense]

mandag den 19. august 2019 kl. 06.04.37 UTC+2 skrev DecadentLinux...@decadence.org:

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in news:eb63850e-
4741-429f-9312-2bca568076d3@googlegroups.com:

also reduces the risk of frying it is plugged into a POE ethernet


They are pretty smart and would likely not energize the port.

Every POE I saw was a managed port that was energized only through
software, but once energized, I suppose one could plug a cable into a
"turned on" port. But I think they have load sensing too, and would
shut the P part off. Likely shut it of for failing to handshake ENET
too.

it depends, the so called "passive POE" is just a powersupply with + connected to one pair and - to another pair

 

[Tom Del Rosso]

Lasse Langwadt Christensen wrote:

mandag den 19. august 2019 kl. 06.04.37 UTC+2 skrev
DecadentLinux...@decadence.org:
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in news:eb63850e-
4741-429f-9312-2bca568076d3@googlegroups.com:

also reduces the risk of frying it is plugged into a POE ethernet


They are pretty smart and would likely not energize the port.

Every POE I saw was a managed port that was energized only through
software, but once energized, I suppose one could plug a cable into a
"turned on" port. But I think they have load sensing too, and would
shut the P part off. Likely shut it of for failing to handshake ENET
too.

it depends, the so called "passive POE" is just a powersupply with +
connected to one pair and - to another pair

They also often put power on the 1-2 and 3-6 pairs.