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I am also interested in this subject as well. We use Ewon in applications. -
Hi Jalal, Thanks for getting in touch. I now understand what you are trying to do. The above comment from @kratmel is the essence of the issue. It sounds like you are using the programming cable that has the MJ10-22-CS25 adaptor on it. The alternative adaptor MJ10-22-CS76 achieves the RX to TX wire swap and also has the opposite DB9 connector. I can organise a MJ10-22-CS76 for you to try. Kind Regards, -
Hi Jalal, Jus to back things up a little, the second port is not fitted by default to the PLC. From the photo you sent I can see that the port 2 slot is empty: The expansion port is completely separate to the add-on COM port. When you are trying to run serial comms and also debug the program using Visilogic, a second port is almost essential. Part number is V100-17-RS4 or V100-17-RS4X. I'll take a guess at who you are working for, but please direct message me to confirm and we will try to help you out. You won't get anywhere trying to connect a USB to serial adaptor into the USB programming port of the PLC. I hope this helps, Kind Regards, Simon
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By Jalal_Flo_Smart · Posted
Hi all, thank you for your prompt response! Yes Kratmel I’ve read the documentation extensively it said that Com 1 has both rs232 and usb. The second port is an IO expansion port. I can try the Rs485 on Com1. I’ve triple checked the wiring, and Ausman, that is correct, it is running in a loop, pretty quickly as well. I’ll try to include the 1 second pulse to slow it down and test. Also I’ve connected the Rj11 to DB9 cable to a DB9 to USB and connected that to the pc and I was able to read the data easily. I am powering the max3232 with 3.3 V. I didn’t quite understand this statement Ausman:” Do a test screen that will show and let you do all you want” I am thinking; - Buy a usb gender changer. - Connect usb mini on plc to USB to DB9. - Connect that to Max3232. - Connect that to ESP32 and test. -
Further to what Kratmel has said, if you are stuck with no other ports for the moment, start from very basics and also do a test screen that will show and let you do all you want, with the plc not connected to the PC. Also, how are you powering the Max? A quick look at your ladder and there is not enough shown to confirm this, but it looks like it is capable of doing a repeat send of something different each scan. 232 and internal buffers will not like the speed of this.
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