ADLINK PCI-C588/PCIe-C588/C584 - Manual (Page 45)

C485
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C485 Card Usage
1. DIP SWITCH SW1:
This is a 4-bit DIP switch. Each bit will set the corresponding port. Bits 1, 2, 3,
and 4 are for ports A, B, C, and D, respectively. Default is ON for a RS422 in-
terface. Set to OFF for RS485.
2. Jumper JP1:
This is jumper to set card number. Default is shorted to set it as the first card.
Open it to set it as the second card.
3. Jumpers JP2,JP3,JP4, and JP5:
These jumpers insert (remove) the 120ohm terminator resistor in the
RS422/485 interface. JP5 is used for port A. JP4 is used for port B. JP3 is used
for port C. JP4 is used for port D. When the jumper is open, the terminator
resistor is removed from interface. Default is no terminator resistor (jumper
open).
4. Usage in RS485 interface mode:
When using the RS485 interface, set the DIP switch in SW1 to OFF. Short pin 2
and pin 3 on the DB9 connector for the DATA+ signal. Short pin 4 and pin 6 for
the DATA- signal. Users can also use our TB485 converter for a DB9 connector
to 3 terminal blocks for DATA+, DATA- , and GND connections.