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  1. #1
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    Metasys closed N2 protocol.

    We have a site that has metasys controllers boards, and talking with Johnson controls rep, they say that this system is a closed n2 protocol system, meaning a third control system ,(ALC) can't interface with it. But there is also a open N2 protocol that a third party control system can interface with. Question is, can this "closed N2" system be opened so I can interface with? Has anyone came across this issue before? Is there an adapter that can open this system up without replacing the metasys control boards.
    Thx
    Sent from my SCH-I535 using Tapatalk 2

  2. #2
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    Nov 2005
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    Shreveport, Louisiana
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    What exactly do you have in the field, we need more information like what the Metasys front is(PMI or MSEA) and what field devices.
    I am not sure if ALC has a N2 driver!!!!
    UA Local 141

  3. #3
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    Apr 2007
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    Amarillo by mornin'
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    Quote Originally Posted by berg2666 View Post
    ...I am not sure if ALC has a N2 driver!!!!
    ALC does have a N2 driver, but I have never used it before. It sounds like that is what he is referencing because ALC lists it as "N2 Open" driver.
    "It's not that I'm smart, it's that I stay with the problem longer”
    Albert Einstein

  4. #4
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    The N2 protocol is a proprietary JCI protocol. They have allowed many third party's to design and sell equipment using the protocol by contracts. Some manufacturers have engineered supervisory and/or gateway equipment that will work with N2. The N2 protocol has 3 "versions" that all work together on the same segment. All the ASC devices (Part # starts with AS-) use N2 open. The DX-9100, and TC-9100 and the LCP use the System 91 version. The AP-VMA use a N2 B version. With the JCI supervisor equipment this really is a non-issue 99.9% of the time. Third party driver suppliers should be able to tell you if they support all the devices.

    This company http://www.s2innovations.com has a gateway that can migrate the N2 bus. No personal experience, but I have heard good things on this board.

    Bill

    Bill

  5. #5
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    Feb 2005
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    I don't think s2innovations has the gateway.
    It is the http://www.thes4group.com/ that has it.

  6. #6
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    Oops... you are right, S4 has the n2-Bacnet router. I get the usb N2 interface from S2. I do use the S2 product and it works great.

    Bill

  7. #7
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    Jan 2013
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    Thanks @amigo, exactly what we are looking for. Appreciate the help and responses from others.

    Sent from my SCH-I535 using Tapatalk 2

  8. #8
    Join Date
    Apr 2005
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    2444 Washington Blvd, Suite 100 Ogden, UT
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    Everyone, Thanks for the referral and the positive reviews. We work very hard to gain your respect. Our BACnet-N2 Router supports all variations of the N2 protocol which means that any device that you find on the N2 bus is supported. Our product is also unique in that the Metasys head end can co-exist with your new head end. We support publisning to BACnet or to OPC. The system is licensed by the number of N2 devices on your bus. Please contact us for more details.
    Steve Jones
    Managing Partner
    The S4 Group, Inc.

  9. #9
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    Apr 2005
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    2444 Washington Blvd, Suite 100 Ogden, UT
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    Quote Originally Posted by access_max View Post
    We have a site that has metasys controllers boards, and talking with Johnson controls rep, they say that this system is a closed n2 protocol system, meaning a third control system ,(ALC) can't interface with it. But there is also a open N2 protocol that a third party control system can interface with. Question is, can this "closed N2" system be opened so I can interface with? Has anyone came across this issue before? Is there an adapter that can open this system up without replacing the metasys control boards.
    Thx
    Sent from my SCH-I535 using Tapatalk 2
    Hey Access_Max, Did you find a solution?
    Steve Jones
    Managing Partner
    The S4 Group, Inc.

  10. #10
    Join Date
    Apr 2007
    Location
    Southwest Riverside County CA
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    Maxline (who picked up Infocon driver line) has an N2 driver for Tridium (ibmsN2.jar) that works very good.. I would add the external RS485 comm port card though to the JACE and add separate networks if possible. Just saying a lot of installs have comm lines headended to the NCM, N30 etc..

  11. #11
    Join Date
    Jan 2014
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    Quote Originally Posted by billcontrols View Post
    The N2 protocol is a proprietary JCI protocol. They have allowed many third party's to design and sell equipment using the protocol by contracts. Some manufacturers have engineered supervisory and/or gateway equipment that will work with N2. The N2 protocol has 3 "versions" that all work together on the same segment. All the ASC devices (Part # starts with AS-) use N2 open. The DX-9100, and TC-9100 and the LCP use the System 91 version. The AP-VMA use a N2 B version. With the JCI supervisor equipment this really is a non-issue 99.9% of the time. Third party driver suppliers should be able to tell you if they support all the devices.

    This company s2innovations has a gateway that can migrate the N2 bus. No personal experience, but I have heard good things on this board.

    Bill

    Bill
    Sorry to pull this dead thread up, but is there any documentation from Johnson Controls that support this information?

    I am currently working with another vendor to integrate a client's old JCI ASC's into a Tridium BAS system. The JCI N2 driver they are providing does not appear to be working correctly as we can't see the ASC's. I am having the discussion of what devices are using N2Open. My DDL files support this info, but it would really help to have some supporting documentation if Johnson has any.

    Thanks!

  12. #12
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    Apr 2005
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    2444 Washington Blvd, Suite 100 Ogden, UT
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    Quote Originally Posted by Mythrandyr View Post
    Sorry to pull this dead thread up, but is there any documentation from Johnson Controls that support this information?

    I am currently working with another vendor to integrate a client's old JCI ASC's into a Tridium BAS system. The JCI N2 driver they are providing does not appear to be working correctly as we can't see the ASC's. I am having the discussion of what devices are using N2Open. My DDL files support this info, but it would really help to have some supporting documentation if Johnson has any.

    Thanks!
    JCI used to make a subset of the N2 Open documentation available for hardware vendors who wanted to include the N2 protocol in their products. This was called the Metasys Compatibility Program and was very tightly controlled. I have not confirmed but I would bet that this program was discontinued when JCI moved to MS/TP for their field bus. The N2 B and System-91 subsets of the N2 protocol were not documented.

    We solved all these issues in our S4 Open: BACnet-N2 Router and take care of the details of communicating with the various subsets of N2, and managing bus errors, etc. Each N2 device is published as a virtual BACnet IP device under a virtual BACnet network. So, since the Tridium system can talk BACnet IP it is a perfect match for this task. My contact info is in my profile if you would like additional information.
    Steve Jones
    Managing Partner
    The S4 Group, Inc.

  13. #13
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    Sep 2006
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    Alaska
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    Hey Stevo, will the S4 Open: Bacnet Router pick up DCM's?
    Law Of The Thermostat: He who has the thermostat wins!!!!!

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