robertmwangi Posted October 20, 2021 Report Share Posted October 20, 2021 hello there, i need some assistance on configuring samba plc sm35-j-R20 for odbus rtu to read an r485 level sensor Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted October 22, 2021 MVP 2023 Report Share Posted October 22, 2021 You'll need to add a V100-17-RS4X communication card to the Samba. After that, read the the Help on the Protocol function block and look at Help->Examples->Version 900->Project Examples->Communications->Modbus to see how to set Modbus up. If you still have trouble have post your program and a link to the datasheet on the sensor so we can have a look. Joe T. Quote Link to comment Share on other sites More sharing options...
robertmwangi Posted November 16, 2021 Author Report Share Posted November 16, 2021 On 10/22/2021 at 7:38 AM, Joe Tauser said: You'll need to add a V100-17-RS4X communication card to the Samba. After that, read the the Help on the Protocol function block and look at Help->Examples->Version 900->Project Examples->Communications->Modbus to see how to set Modbus up. If you still have trouble have post your program and a link to the datasheet on the sensor so we can have a look. Joe T. LLS Protocol intergration RS232_RS485_V1.0.pdf Thanks Joe for the kind help. i still need help. attached is the sensor datasheet. Am using Samba sm35-j-R20. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted November 17, 2021 MVP 2023 Report Share Posted November 17, 2021 I was incorrect in my previous post mentioning Modbus. This sensor has it's own protocol. Take a look at the examples under "Communications ->FB Protocol". This is not an entry level PLC program. Do you have the sensor in hand? I suggest you first familiarize yourself with serial communications by purchasing a USB to RS485 converter for you computer and learning how to communicate with the sensor using a terminal program on your PC such as Bray's terminal - https://sites.google.com/site/terminalbpp/. You'll need to know exactly what strings to generate using the Protocol function and it's much easier to learn how the sensor works using a known working send/receive tool such as a terminal. Joe T. Quote Link to comment Share on other sites More sharing options...
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