Interroga Posted May 7, 2018 Report Share Posted May 7, 2018 If possible, show me an example of communication with the fx2n series through 485 media. One important information: All blocks in toolbox have ? simbol for explain funtion block .But COM:Serial don't have a help in help glossary . My doubt is if this block have a internal checksum or is necessary put together inside the message? Regards, Quote Link to comment Share on other sites More sharing options...
DanT Posted May 8, 2018 Report Share Posted May 8, 2018 What PLC are you using? Have you setup the RS485 Communications in the hardware configuration? Com - PLC Communications-Physical-Serial Com and then Com- PLC Communications-Protocols - Modbus Who is Master? Slave? Mitsubishi supports Modbus, Have you set up the protocol in it? Master or Slave? Download the UniStream Example programs from the download section -just below the UniLogic download. Under Communications there are a couple of RS485 Examples to help guide you. - General - Not Mitsubishi Specific. Quote Link to comment Share on other sites More sharing options...
Interroga Posted May 9, 2018 Author Report Share Posted May 9, 2018 I use fx2 series, it not have a modbus, because it is legacy system in site my client. I see examples , but not help me. After , i discovered in message composer having a checksum , optional and there was information about this resource in help . I feel like a blind man walking on the street with a walking stick looking for information. kkkkk... Thanks in advance for try help me. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted May 9, 2018 MVP 2023 Report Share Posted May 9, 2018 This is not a trivial task. And yes, the Help is currently a little light on the COM blocks. You'll need to define exactly what data it is in the Mitsubishi you want. Who will be the master - Visilogic or the Mitsubishi? You'll need to get very familiar with this document: FX Communication Protocol It looks like in the Mitsubishi you can set D8120 to turn off the checksum. Look at chapter 6 of the manual. Get a USB->485 converter and develop the strings you'll need using a terminal program- I like this one: Bray's Terminal This is a much easier and faster way to figure out protocol strings. Once you've got the strings you need, you can start to configure your COM:Protocol blocks. Send a request to support@unitronics.com for direct help on this. Joe T. Quote Link to comment Share on other sites More sharing options...
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