LiftMaster Dial Code Dial Code VF Series Manual - Page 15

RS-485 CONNECTION CONFIGURATIONS Configuration #1 "Daisy Chain" wiring configuration (Recommended method for superior data transmission) • Up to 31 RS 485 devices supported • Maximum distance from the last RS 485 device to the Entry Phone is 4000 Ft. • Turn "ON" the terminator switch ONLY for the last device installed in the RS 485 line. • Use 22 AWG twisted pair shielded wire Turn Terminator Switch "ON" for Last Device on Wire Run Gnd + - 4000 Ft Max. Each RS 485 device must have a unique "Device ID Number" set by using the rotary switches on the device. (Refer to specific RS 485 Instruction sheets). Configuration #2 "Star" wiring configuration • Maximum number of wire runs allowed is 7 • Maximum distance from the last RS 485 device (per wire run) to the Entry Phone is 4000 Ft. Turn Terminator Switch "ON" for Last Device on Wire Run • Maximum number of RS 485 devices present on ALL wire runs is 31. • Use 22 AWG twisted pair shielded wire 4000 Ft Max. Turn Terminator Switch "ON" for Last Device on Wire Run - + Gnd Wire Run Turn Terminator Switch "ON" for Last Device on Wire Run Turn Terminator Switch "ON" for Last Device on Wire Run Turn Terminator Switch "ON" for Last Device on Wire Run Turn Terminator Switch "ON" for Last Device on Wire Run Turn Terminator Switch "ON" for Last Device on Wire Run Each RS 485 device must have a unique "Device ID Number" set by using the rotary switches on the device. (Refer to specific RS 485 Instruction sheets). PAGE 14