7/21/2010 12:01 PM | |
Joined: 8/22/2009 Last visit: 7/11/2024 Posts: 42 Rating: (1) |
WAITING FOR YOUR HELP |
Veolia |
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7/21/2010 4:37 PM | |
Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684) |
Hello Ahmed; Could you please show us where you see the requirement for 330 Ohms as line termination for your 1SI module? Modbus serial standards require a 150 Ohm termination on mutipoint (RS-422 and RS-485) systems, and this is the requirement I have followed on every Modbus line I have setup. Here is a quote from the Modbus over serial lines document, from Modbus.org: MODBUS over serial line specification and implementation guide V1.0 Modbus.org http://www.modbus.org/ 28/4412/02/02 Each line termination must be connected between the two conductors of the balanced line : D0 and D1. Line termination may be a 150 ohms value ( 0.5 W ) resistor Hope this helps, Daniel Chartier |
7/24/2010 7:30 AM | |
Joined: 8/22/2009 Last visit: 7/11/2024 Posts: 42 Rating: (1) |
kindly explain this to me. Attached file is the page talk about 330 ohm line terminator. |
Veolia |
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6/28/2016 9:21 PM | |
Joined: 1/21/2013 Last visit: 9/4/2024 Posts: 4620 Rating: (707) |
Hello all I would ask Saravana , since his project works ask them also because in the manual of the CP 341 Modbus Master is specified the same resistance terminal 330 Ohm https://support.industry.siemens.com/tf/ww/en/posts/modbus-sample-project/44769/?page=0&pageSize=10 |
Last edited by: Ste39 at: 6/28/2016 9:23:01 PM |
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