Modbus: Trouble communicating through a Modicon/Schneider BM85 Modbus bridge

I am having trouble communicating through a Modicon/Schneider BM85 Modbus bridge

1. Make sure the BM85's port mapping table is set properly.
2. If you are using the Modbus Serial driver, you may need to choose DTR flow control in the server's Channel Properties, on the Communications tab.