J
I have looked and looked all over, and I can find people saying that it CAN be done, just no how-tos or lists of pitfalls to avoid, etc. I have a Twido Compact 24 PLC that I am trying to figure out how to connect to a ProFace ST400 HMI. The Twido uses RS485 on it's com port, and the Proface uses RS-422. I can make the cable, I just need to know what the pinout should be, do I need any extra components, etc? If someone is willing to help me, and needs them to figure it out, I can send PDFs of the manuals for both devices.
These devices were already chosen for me by my predecessor, who left the company before completing this machine (a medical gel dispensing system). I don't know if he realized that the two were different interfaces, or what. The built-in serial port will have the Proface hooked to it, as the only device. We have an add-on port that is connected to four motor drives.
I have been having to learn about all of this rather quickly. My main background is in computers, with a fair bit of electronics (TV/VCR/DVD/whatever) repair knowledge thrown in the mix. I can learn quickly, and I have been learning a lot. Prior to 5 weeks ago, I had no idea what Modbus was. Now I understand quite a bit, I just can't get my head wrapped around this, as I have been able to find no definitive answers.
These devices were already chosen for me by my predecessor, who left the company before completing this machine (a medical gel dispensing system). I don't know if he realized that the two were different interfaces, or what. The built-in serial port will have the Proface hooked to it, as the only device. We have an add-on port that is connected to four motor drives.
I have been having to learn about all of this rather quickly. My main background is in computers, with a fair bit of electronics (TV/VCR/DVD/whatever) repair knowledge thrown in the mix. I can learn quickly, and I have been learning a lot. Prior to 5 weeks ago, I had no idea what Modbus was. Now I understand quite a bit, I just can't get my head wrapped around this, as I have been able to find no definitive answers.