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Francisco1998 · Junior Joined: 25 Nov 2021 Posts: 7

Hello to everyone. Nice to meet you all.

I am programming a KINCO PLC tip HP043-20DT using ladder on KINCO BUILDER. I need to establish a serial communication with my PC. The PLC has a RS485 port which I adapted it to USB to connect with my PC. The PLC allows, at least, two ways to establish serial communication: MODBUS or free-protocol. I've read the software manual and tried to reproduce the examples it provides using the instruction blocks for MODBUS (MBUSR and MBUSW) and free-protocol (XMT and RCV) communications. However, I could not receive the data on the PLC. I could effectively transmit data with XMT from the PLC to the PC and I could verify through a tool called Access Port. In relation to MODBUS, I am using a simulation tool called Multiway from OMRON, however, I get no response from the PLC.

If any of you have some experience with this software or this device, I would like to ask you how could I solve the problem.

Thank you for your attention. Kind regards.

Skumala · Junior Joined: 22 Sep 2021 Posts: 2

You have all you need in here
https://www.spstiger.de/downloads/Kinco%20DTools/HMI%20and%20PLC%20connecting%20guide.pdf

[url=http://www.girlshare.ro/3770136053.2]L011663+-+HMI-PLC-HP043-20DT+User+Manual.pdf[/url]

You want to program the PLC or to communicate with other device like HMI.
If PLC programming it's RS485 adapter not Modbus

https://en.kinco.cn/download/plcdemo.html

Francisco1998 · Junior Joined: 25 Nov 2021 Posts: 7

Dear Skumala,

Thank you for your response. I've already downloaded the manuals you shared.

I could identify the pins of the RS485 port correctly. I adapted the RS485 interface to USB. I attached a picture of the physical connection.

https://ibb.co/cy5cM6p
Serial communication with KINCO PLC Serial communication with KINCO PLC

Serial communication with KINCO PLC Serial communication with KINCO PLC

The problem I'm dealing with is more related to the PLC programming. I want to communicate with my PC. I followed the steps published in the software manual but I could not make the communication work.

I'm open to any suggestion.

Thanks. Kind regards!