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  1. #1
    Join Date
    Jan 2008
    Location
    NY
    Posts
    96

    Liebert Sitescan and Modbus simultaneously

    We are integrating to AX a site that has a mix of Liebert CRACs and UPSs communicating to a Sitescan system. They have the intellislot 485 cards and we have proper communications with the Modbus. After slowing down the polling rate, the Modbus side is stable but the Sitescan side is not. We have to disconnect the comm connection of the machine's internal bus to the 485 card for Sitescan to operate properly.

    Are these mutually exclusive or is there some tweaking that can be done on the sitescan side?

  2. #2
    Join Date
    Nov 2007
    Location
    Sacramento, CA
    Posts
    63

    How many devices?

    How many devices are on the bus?

    What baud rate are you using?

  3. #3
    Join Date
    Jan 2008
    Location
    NY
    Posts
    96
    3 CRACs and 2 UPSs. Modbus is 9600. That is the only speed available with any Liebert stuff I have worked with.

  4. #4
    Join Date
    Nov 2007
    Location
    Sacramento, CA
    Posts
    63
    That should be just fine.

    We have 44 or more Leibert units divided amongst 8 JACEs, and the sitelink doesn't have an issue.

    Is the JACE connected to it's own dedicated bus network separate from the sitelink?

    I would suggest calling the manufacturer.

    Try this website http://www.emersonnetworkpower.com

    Thanks

  5. #5
    Join Date
    May 2009
    Posts
    627
    Is this an ICOM logic air-conditioner? You say you have an intellislot 485 and then how is sitescan connected to the air-conditioner? What you should have is a IS485EXT card that forwards velocity to the sitelink-E. Then inside the air conditioner the communications protocol would be set to velocity version 4.

    What you can't do is have the air conditioner set up for IGM protocol sending that to a sitelink and then add a communication card. IGM can't be shared between two masters.
    Scott Jalbert
    Harris Integrated Solutions

    Formerly Liebert (Emerson Network Power)
    Expressed opinions are my own

  6. #6
    Join Date
    Jan 2008
    Location
    NY
    Posts
    96
    Quote Originally Posted by MaxBurn View Post
    Is this an ICOM logic air-conditioner? You say you have an intellislot 485 and then how is sitescan connected to the air-conditioner? What you should have is a IS485EXT card that forwards velocity to the sitelink-E. Then inside the air conditioner the communications protocol would be set to velocity version 4.

    What you can't do is have the air conditioner set up for IGM protocol sending that to a sitelink and then add a communication card. IGM can't be shared between two masters.
    I believe I misstated that I have Intellislot cards. These are older, Pre-ICOM logic units, Deluxe System/3 I believe. The tables out of SL-28170 for the CRACs is table 26 and for the UPSs is 85. The data matches fine for the Modbus.

    So since the Sitescan SieLinkE-SSW-12E talks with IGM to the units, I will not be able to have the Comm cards online as well. Thanks for chiming in MaxB that explains it.

  7. #7
    Join Date
    May 2009
    Posts
    627
    Yes, IGM is like modbus in the respect that you can't have two masters on the line requesting information from the slave devices.
    Scott Jalbert
    Harris Integrated Solutions

    Formerly Liebert (Emerson Network Power)
    Expressed opinions are my own

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