RMS Technologies ACC-03 RS485 TO RS232 CONVERTER CARD (ROHS) - Manual (Page 6)

RS485 Connection with full duplex
If your RS485 device is a full duplex, or 4-wire device, below is the
recommended connection to the RS485-232 converter card.
120 Ω
120 Ω
RS485 Full duplex RS485 Converter
card
Figure 4: Full duplex conneciton
Multi-drop network (Daisy Chaining)
In order to communicate to multiple units at once, combine all three RS485
communication wires in parallel as shown below:
RS485 Converter
Card
Figure 5: Multi-drop connection
RS485-232 Converter Card Page 6 3/20/2009