Title: Hardware Installation Guide.pdf
Jumper J33 pins 1 & 2 for RS-485 communications termination. Install jumper on the last DDC unit on the communications line for proper termination of the communications bus. For more information, refer to the DDC upstream communicationdiagram on page 420.Reader 1 output voltage selection:Jumper J12 pins 1 & 2 for +12VDC readersJumper J12 pins 2 & 3 for +5VDC readersReader 2 output voltage selection:412 — revision 6Hardware Installation GuideJumper J17 pins 1 & 2 for +12VDC readersJumper J17 pins 2 & 3 for +5VDC readersReader 1 RS-485 termination:Jumper J29 pins 1 & 2 for RS-485 reader communications.Important:Do NOT install the jumper for Wiegand/Clock & Data/F2F Reader Communications.Reader 2 RS-485 termination:Jumper J31 pins 1 & 2 for RS-485 reader communications.Important:Do NOT install the jumper for Wiegand/Clock & Data/F2F Reader Communications.Reader 1 data line pull-up voltage selection:Jumper J9 pins 1 & 2 for +12VDC Data Lines