2/28/2017 9:01 AM | |
Posts: 49 Rating: (1) |
HI, Can i know , do really need the dongle for the ASCII protocal. If we using modbus RTU that time only we need Doggle. correct. i donot about this so i am asking. yesterday i got the 16#301 error. in the manual it was showing parameter error or wiring error i have modified the program for the communication that program i didnot checked. today only i am going to check. so if have error please update me. Here i have attached the program and the screenshot. if my program have any error please update me Attachmentprogram and screenshots.zip (373 Downloads) |
2/28/2017 9:26 AM | |
Posts: 49 Rating: (1) |
Hi, Sorry. no modbus ASCII. it was ASCII protocol. Slave device accept ASCII protocol Update: ok another question, you've mentioned from yesterday you have error, so you have communication established before with Slave via Modbus ASCII protocol and your CP341? - i have used ascii protocal. with cp-341 it was showing error. ASCII it was working in modbus Poll software Device detail is - TC202a , Manufacture is Thermon AttachmentScreenshots.zip (329 Downloads) |
2/28/2017 10:58 AM | |
Posts: 49 Rating: (1) |
hi, ok thanks for your concerns tomorrow i will check with the dongle and update you what is status. |
3/1/2017 10:23 AM | |
Posts: 3093 Rating: (322)
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No, they are different Regards, |
3/1/2017 12:55 PM | |
Posts: 3093 Rating: (322)
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Hello Duris, The dongle for ModbusRTU master and ModbusRTU slave are identical and the dongle for ModbusASCII master und ModbusASCII slave are identical. By the way, ModbusASCII can only be used with the old versions of CP341. Regards, |
3/1/2017 3:02 PM | |
Posts: 49 Rating: (1) |
Hi, Thanks for your information. we have already purchased later version module (1CH02). and Modbus Master (RTU) license. Can you help me how to solve this issue. Because we cannot use Modbus ASCII in the later version module. that device only accept modbus ASCII. please. |
3/4/2017 10:45 AM | |
Joined: 12/1/2009 Last visit: 3/31/2024 Posts: 672 Rating: (147) |
Dear PlUg & PlAy, when it comes to Modbus a S7-300 is not really a good choice. The CP341 + license dongle is by far the most expensive solution. Anyway, these are your options now:
Best Regards. TIBI68 |
Last edited by: TIBI68 at: 3/4/2017 11:00:48 AMGive us your feedback and show us your respect! |
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3/5/2017 8:39 AM | |
Joined: 12/1/2009 Last visit: 3/31/2024 Posts: 672 Rating: (147) |
Helpful links: The MODBUS Bible: http://modbus.org/docs/PI_MBUS_300.pdf LRC/CRC Online calculation for verification: http://www.scadacore.com/field-applications/programming-calculators/online-checksum-calculator/ Best Regards. TIBI68 |
Give us your feedback and show us your respect! |
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3/5/2017 8:59 AM | |
Posts: 49 Rating: (1) |
hi, thanks for your concerns. Ok, i check with software and i will update the status |
3/5/2017 3:21 PM | |
Joined: 4/28/2015 Last visit: 2/7/2024 Posts: 10533 Rating: (818) |
Hello, again pls check also my pictures, probably this is only example. If we take your mentioned frame that you've build (mentioned in some previous post) with register number hex 65, frame can be different to my previous. Look pls to new zip attachment, I was preparing this due your mentioned required 101 address. Attachmentmb_ascii_test.zip (227 Downloads) |
With best regards... |
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