If you need more RS-232 ports than are available on the Domain Controller or if you have a number of RS-232 ports in one location and would rather pull just one Ethernet to that location, then you will want to add a Lantronix USD 100 or USD 200 (www.lantronix.com) to the project.
If the Domain Controller is up and running and the USD does a power cycle, it may lose communication with the Domain Controller.
There are 2 models to choose from. The USD 100 supports 1 serial port and the USD 200 supports 2 serial ports. Both are 4" L x 4" W x 0.9" H in size and have the following attributes:
Serial Interface
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Network Interface
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For the RCS 8CUR Relay Controller
Make sure the B+ and A- wires are a twisted pair.
The dip switch settings should be:
The RS232 is a straight through cable to the Domain Controller.