Omron C200H requires a Host Link Module.
There were two different types, one that mounts to the front of the cpu, one that mounts in the I/O backplane.
3G2A6-LK201(-V1) is the part number for the cpu mount unit.
C200H-LK201 is the part number for the backplane mount type.
You may be able to find one on ebay.
Cable is a standard null modem cable.
Host link connector is a DB25.
Omron offers a solution. Part number C200H-IP007.
This also requires cable part number CQM1-CIF02.
Total price is $3125.00 US dollars.
C200H was discontinued in 2001.
Hope this will help.