How to connect Delta TP70P-RM1 HMI to Inovance H1U PLC under RS-485?

[Ivan Bratanov]

Hello and good day to you! I have the following problem. There was a Delta TP04G-AS2 series text panel communicating with Inovance H1U PLC through dedicated D-SUB9-to-miniDIN8 cable, using the HMI's COM1 port, which works under RS-232 protocol only. There was a LED indicator on the front of the panel which showed that the communication is established under RS-232 protocol. I decided to replace the TP04 text panel with Delta TP70P-RM1 graphics panel. I wrote a program and dowloaded it to the panel using dedicated USB cable (the panel has USB port especially for program download/upload).

And there comes the problem. The TP70P panel has only one D-SUB9 port (COM3), which unlike the TP04 uses RS-485 protocol only. It was unable for me to establish a connection between the PLC and HMI. The TP70P panel shows "Connection error: COM3:ID1" every 5 seconds. The program is properly downloaded to the HMI, appears just like it has to be, but the communiaction between the HMI and PLC still cannot be achieved. The PLC's COM 0 port works under RS-485/422 protocols, that is, both TP70P panel's COM 3 port and PLC's COM 0 port are capable of working under RS-485. And nevertheless they don't want to communicate each other! Should I change something in the PLC?

Please help!

Thank you!

[alanfr88]

I am looking software to h3u autoshop version 2.5 - 2.9 and it6070e. do you have?