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For a 2-wire RS-485 configuration, use one of the positive screw terminals (pin 6 or 3) and one of the negative screw terminals (pin 7 or 4). The choice is yours, for example, pins 6&7, 6&4, 3&7, or 3&4. Please refer to the Digi One IA / IAP Quick Start Guides and User Guides for more information. Digi One IA/IAP Quick Start Guide: https://www.digi.com/resources/documentation/DigiDocs/pdfs/90000634-88.pdf Digi One IAP User Guide: https://www.digi.com/resources/documentation/digidocs/pdfs/90000263.pdf Digi One IA User Guide: http://ftp1.digi.com/support/documentation/92000326_D.pdf Digi One IA Setup Card: http://ftp1.digi.com/support/documentation/91001107_b.pdf