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Groups > comp.arch.embedded > #27796 > unrolled thread
| Started by | duke@dukelec.com |
|---|---|
| First post | 2018-06-12 04:08 -0700 |
| Last post | 2018-06-12 07:28 -0700 |
| Articles | 4 — 3 participants |
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Re: Multi Master RS485 is it possible ? duke@dukelec.com - 2018-06-12 04:08 -0700
Re: Multi Master RS485 is it possible ? David Brown <david.brown@hesbynett.no> - 2018-06-12 13:55 +0200
Re: Multi Master RS485 is it possible ? (SPAM) Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2018-06-12 16:22 +0300
Re: Multi Master RS485 is it possible ? (SPAM) duke@dukelec.com - 2018-06-12 07:28 -0700
| From | duke@dukelec.com |
|---|---|
| Date | 2018-06-12 04:08 -0700 |
| Subject | Re: Multi Master RS485 is it possible ? |
| Message-ID | <fb917f8a-28ee-491f-976d-727a22bed267@googlegroups.com> |
On Wednesday, 5 November 1997 16:00:00 UTC+8, Dr John Tankard wrote: > I have seen many examples of a single master multiple slaves RS485, my > question is :- is there any reason why there cannot be multiple > masters on the wire ? > > Thanks in advance > > John Tankard > > jtankard@tankard.com The CDBUS protocol for RS485 avoid collisions just like the the CAN bus: https://github.com/dukelec/cdbus_ip
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| From | David Brown <david.brown@hesbynett.no> |
|---|---|
| Date | 2018-06-12 13:55 +0200 |
| Message-ID | <pfocb5$1mo$1@dont-email.me> |
| In reply to | #27796 |
On 12/06/18 13:08, duke@dukelec.com wrote: > On Wednesday, 5 November 1997 16:00:00 UTC+8, Dr John Tankard > wrote: >> I have seen many examples of a single master multiple slaves RS485, >> my question is :- is there any reason why there cannot be multiple >> masters on the wire ? >> >> Thanks in advance >> >> John Tankard >> >> jtankard@tankard.com > > The CDBUS protocol for RS485 avoid collisions just like the the CAN > bus: https://github.com/dukelec/cdbus_ip > Is this a new record for necroposting in this newsgroup? While it is good of you to try to help the OP, I doubt if he has been sitting for over 20 years waiting for an answer!
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| From | Tauno Voipio <tauno.voipio@notused.fi.invalid> |
|---|---|
| Date | 2018-06-12 16:22 +0300 |
| Subject | Re: Multi Master RS485 is it possible ? (SPAM) |
| Message-ID | <pfohee$41b$1@dont-email.me> |
| In reply to | #27797 |
On 12.6.18 14:55, David Brown wrote: > On 12/06/18 13:08, duke@dukelec.com wrote: >> On Wednesday, 5 November 1997 16:00:00 UTC+8, Dr John Tankard >> wrote: >>> I have seen many examples of a single master multiple slaves RS485, >>> my question is :- is there any reason why there cannot be multiple >>> masters on the wire ? >>> >>> Thanks in advance >>> >>> John Tankard >>> >>> jtankard@tankard.com >> >> The CDBUS protocol for RS485 avoid collisions just like the the CAN >> bus: https://github.com/dukelec/cdbus_ip >> > > Is this a new record for necroposting in this newsgroup? > > While it is good of you to try to help the OP, I doubt if he has been > sitting for over 20 years waiting for an answer! It is just plain old spam for something the poster thinks to have invented years ago. There have been such protocols in the RS-485 bus for years before his invention. -- -TV
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| From | duke@dukelec.com |
|---|---|
| Date | 2018-06-12 07:28 -0700 |
| Subject | Re: Multi Master RS485 is it possible ? (SPAM) |
| Message-ID | <57993939-0bbf-4c44-9bca-ff3fbced50af@googlegroups.com> |
| In reply to | #27798 |
On Tuesday, 12 June 2018 21:22:25 UTC+8, Tauno Voipio wrote: > On 12.6.18 14:55, David Brown wrote: > > On 12/06/18 13:08, duke@dukelec.com wrote: > >> On Wednesday, 5 November 1997 16:00:00 UTC+8, Dr John Tankard > >> wrote: > >>> I have seen many examples of a single master multiple slaves RS485, > >>> my question is :- is there any reason why there cannot be multiple > >>> masters on the wire ? > >>> > >>> Thanks in advance > >>> > >>> John Tankard > >>> > >>> jtankard@tankard.com > >> > >> The CDBUS protocol for RS485 avoid collisions just like the the CAN > >> bus: https://github.com/dukelec/cdbus_ip > >> > > > > Is this a new record for necroposting in this newsgroup? > > > > While it is good of you to try to help the OP, I doubt if he has been > > sitting for over 20 years waiting for an answer! > > > It is just plain old spam for something the poster thinks > to have invented years ago. There have been such protocols > in the RS-485 bus for years before his invention. > > -- > > -TV Yes, I know there are many protocol similar to this one, but most of them are implemented by software, which was very inefficient.
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