Posted 18 Feb 2017 I'm working on a old machine. It has a C20h controller and expansion unit. I already have the Syswin software 3.4 . Omron tech support gave me a link. What cable do I need to connect the laptop to a serial port? I can make one. Can I use a USB to serial converter as serial ports are rare. Thanks, John Share this post Link to post Share on other sites
Posted 18 Feb 2017 USB converters are not always reliable with the older units. Does you PLC have the LK201 serial module attached? I am pretty sure you will need one of those to get online with it. Share this post Link to post Share on other sites
Posted 18 Feb 2017 (edited) Crossbow is correct. If you get an LK201 module, make sure it is the one with 'C200' in the part number. The one with 'C20' in the part number is only for the K series. Very confusing. The C20H may have a DE9 connection on it as well. If this is the case then you can communicate via this port using Host Link mode. This PLC is very old so the manual shows connection to DB25 on the computer side. I hope I got the conversion correct. The older Omron manuals also referred to the PLC as a PC (Programmable Controller). Those who are familiar with Omron equipment may notice this Host Link port uses pin 7 for ground where (dare I say) 'newer ones' use pin 9. Edited 18 Feb 2017 by IO_Rack See Below: Share this post Link to post Share on other sites
Posted 18 Feb 2017 Please allow my correction. If you choose to use a CPU Mounted Host Link Unit, the part number is: 3G2A6-LK201-EV1 / C120-LK201-EV1. The one that looks identical but will NOT work is: 3G2C7-LK201-EV1 / C20-LK201-EV1. As I said, it's confusing. Share this post Link to post Share on other sites
Posted 18 Feb 2017 You can use the built in port but you will have to build this cable. http://forums.mrplc.com/index.php?/files/file/349-universal-cable-for-omron-9-pin-port/ Share this post Link to post Share on other sites
Posted 21 Feb 2017 So I can plug directly into the RS_232C serial port on the PLC to the serial port on the computer running Syswin using this cable. Or do in need to get something else to attach to the PLC? Thanks? Share this post Link to post Share on other sites
Posted 21 Feb 2017 You don't need anything else. Be sure to notice that Pin7 and Pin9 are connected together. One problem: the default setting is Sysway protocol,9600,E,7,2. If somebody has changed the default protocol to anything other than Sysway, you are out of luck. Share this post Link to post Share on other sites
Posted 21 Feb 2017 Oh come on Jay. You can always fix it with a PRO27 . Share this post Link to post Share on other sites
Posted 23 Feb 2017 Im making the cable now. I understand the RX/TX wires and the ground but the CTS and RTS wires have a box around the middle of them on the drawing. Do I need to connect them to? And are they connected together? You can use the built in port but you will have to build this cable. http://forums.mrplc.com/index.php?/files/file/349-universal-cable-for-omron-9-pin-port/ Thank for all your help. Share this post Link to post Share on other sites
Posted 1 Mar 2017 Made the cable and was able to get online thanks for al the help john Share this post Link to post Share on other sites
