I have only one USB port on my older IBM, Using a 'IOGEAR' model GUH274, 4 port USB 2.0 hub and 'Keyspan' model USA-19HS USB to serial adapter gives me no trouble at all. On a typical day I will use the blue tooth, plugged into the 4 port USB device to talk with a plc or a serial connection, than use one of the serial port adapters to talk with a HMI, and another serial port adapter to talk with a servo.

OVERVIEW OMRON PLC SOFTWARE SYSWIN 3.4. Download & read the SYSWIN 3.4 manual. Then you must install SYSWIN again, and enter a valid Serial Number.

This is done with all three devices online with the laptop at the same time. I received a tip from a Omron tech about the Keyspan USB to serial port adapter.

He said he used it everyday with no trouble, unlike others he tried. I have used the Keyspan for 2 years. Omron Plc types CPM1.

CPM2A, C200HE, CS1, CJ, SERIES. Never a connection problem. Hope this helps. I used to use the MT 609 adaptor which worked OK only as long as the Omron was in Host link mode for the connection. The other two protocals Sysmac and toolbus we ran into trouble. Funny part was that I had a connection with the MT 609 long enough to start a download but during the download it had changed something that caused errors during the download so I had to install my CX-one onto a desktop computer to use a serial port which allowed me to connect.

After I talked to an Omron tech got bounced around to over 15 different techs with Omron until one of them was able to explain reasonably what had happened. Obrazec dogovora na tendernoe soprovozhdenie. After that fiasco my company was more than willing to buy the correct adaptor.