3/3/2013 6:41 AM | |
Joined: 12/1/2009 Last visit: 3/31/2024 Posts: 672 Rating: (147) |
Great jagan.k , I am happy for you guys. You just saved another CP and a Modbus license! |
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This contribution was helpful to1 thankful Users |
7/12/2013 8:52 AM | |
Joined: 4/24/2009 Last visit: 2/19/2024 Posts: 2683 Rating: (135) |
Follow-up-question splitted to communicate with a Masibus Temparature Scanner (85xx series, communication protocall RS 485) Best regards O_Moderator |
8/22/2013 11:38 AM | |
Joined: 4/24/2009 Last visit: 2/19/2024 Posts: 2683 Rating: (135) |
New question was splitted to connect honeywell DCS with CP340 on modbus protocol & to get the data of cpu 313c-2dp. Best regards O_Moderator |
12/16/2013 3:29 PM | |
Joined: 9/1/2005 Last visit: 3/5/2024 Posts: 4097 Rating: (193) |
follow up question published byMahesh Nis split to a seperate thread with the subject CP340 MODBUS RTU-Communication - Questions to a specific solution Best regards CS Moderator |
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12/25/2013 11:24 AM | |
Joined: 12/1/2009 Last visit: 3/31/2024 Posts: 672 Rating: (147) |
Dear LKMNVRS, PTP stands for Point-to-Point and isa type of connection betweenthe CP and one field device.In order to connect to more than one fielddevices you need to use a multi-drop type connection. That's a kind of a networkconnection. MODBUS RTU is a protocol, you can simply see it as a"language" the devices can talk/communicate with each other. Soyou need to know about the physical interface on your VMS and the supported protocol(s). These Informationneed to match with theCP340 in order to establish the communication. The CP340 supports the below protocols: - 3964(R) - ASCII - Printer driver Modbus is nativly not supported by the CP340 but I have developed a software driver for it. That driver doessupportthe MODBUS MASTER RTU standard protocol and can be downloaded in this thread from one of myprevious posts (MBMA340.ZIP). Merry X-Mas to you and everybody. Best Regards. |
Last edited by: TIBI68 at: 12/25/2013 11:25 AMGive us your feedback and show us your respect! |
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12/26/2013 7:12 AM | |
Joined: 12/1/2009 Last visit: 3/31/2024 Posts: 672 Rating: (147) |
Dear LKMNVRS, if your devices will act as aModbus RTU slave, yes my software will work. Just for clarification, the driver does not support Modbus ASCII (that's a different thing), only Modbus RTU. It uses the ASCII frame fortransmission, don't get confused. Best Regards. |
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12/27/2013 8:15 AM | |
Joined: 12/1/2009 Last visit: 3/31/2024 Posts: 672 Rating: (147) |
Dear LKMNVRS , you are doing fine, you just need to call the MBMAREQ block with different slave address number. The LINK is the connection between the MBMAREQ and the MBMA340 block. So in your case you need to keep it the same. I would first connect one slave to the CP only and try to read one available register, Troubleshooting is a lot easier this way. Make sure the communication parameters match with all devices. If it's still not working, check the cableing. Good Luck! Best Regards. |
Last edited by: TIBI68 at: 12/27/2013 8:18 AMGive us your feedback and show us your respect! |
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