User manual AMX AXLINK WIRING CONSIDERATIONS

[. . . ] The RMA number must be clearly marked on the outside of each box. After the 30-day period the RMA will be cancelled. Any shipments received not consistent with the RMA, or after the RMA is cancelled, will be refused. AMX is not responsible for products returned without a valid RMA number. [. . . ] 4 Using Ground Shielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 AXlink Wiring Considerations i Table of Contents ii AXlink Wiring Considerations AXlink Wiring Considerations AXlink Wiring Considerations This document describes AXlink, wiring topologies, electrical timing and characteristics, compatible cable types, wiring distance calculations, and wiring diagram examples. AXlink is a proprietary communication protocol designed by AMX to control up to 255 devices with a Central Controller using common copper conductors. The AXlink Protocol The AXlink communication protocol supports multiple wiring topologies, including star, daisychain, home run, or any combination. AXlink devices are electrically wired in parallel and require a minimum of three conductors for signal/power ground, AXM, and AXP. An optional fourth conductor can be used for 12 VDC power distribution. The AXM and AXP AXlink data signals are differential and require one pair of twisted conductors. The wiring distances for the AXB-MPE Master Port Expander and AXB-SPE Slave Port Expander devices are calculated on a per-port basis. The ports on the AXB-MPE and AXB-SPE devices are isolated and electrically independent with respect to each other. The wiring distance specifications describe the total wiring distance between external devices and the Central Controller. 1 shows a star wiring topology, and the total wiring length is 1, 200 feet (200 + 300 + 300 + 400 = 1200). FIG. 1 Star wiring topology example AXlink Wiring Considerations 1 AXlink Wiring Considerations AXlink Electrical and Timing Characteristics FIG. 2 shows the electrical and timing characteristics of AXlink. The table below describes each characteristic. FIG. 2 AXlink electrical and timing characteristics Electrical timing characteristics Parameter Trise Tfall Vhigh Vlow Vdiff Description Rise time for AXM and AXP Fall time for AXM and AXP AXM and AXP voltage with respect to AXlink ground AXM and AXP voltage with respect to AXlink ground -0. 7 Voltage difference between AXM and AXP 1. 0 Min. 20. 0 20. 0 5. 1 Units µS µS V V V pF Capacitance Total capacitance of AXlink bus wiring Cable Types and Maximum Distances Compatible AXlink cable types include those manufactured by Liberty Wire & Cable Inc. , and cables that comply with Category 5 or Belden 8102 standards. To determine the maximum distances, refer toPower Distribution section on page 3. Pre-manufactured AXlink cable The Liberty Wire & Cable Inc. manufactures AXlink cable that contains two pairs of conductors. The data pairs comprise 22 AWG stranded shielded twisted pair (STP) with a single drain wire, and a 12 VDC power pair of 18 AWG stranded wire. The nominal capacitance between the data conductors is 12. 5 pF/ft. AXlink cable, the maximum overall cable distance between the Central Controller and all external devices for data communication is 3, 000 feet with no remote power. You can contact Liberty Wire & Cable Inc. at 4630 Forge Road, Suite A, Colorado Springs, CO 80907 or by calling (800) 530-8998. 2 AXlink Wiring Considerations AXlink Wiring Considerations Power Distribution The following table lists the maximum cable lengths by electrical current and wire gauges (AWG). of 13. 5 volts available at the Central Controller's power supply. Maximum AXlink current and cable lengths by wire AWG Maximum Current Milliampere (mA) 50 100 250 500 1, 000 18 AWG 2, 347 1, 174 469 235 117 Cable length by wire AWG 20 AWG 1, 485 743 297 149 74 22 AWG 926 463 185 93 46 24 AWG 584 292 117 58 29 Calculating AXlink wiring distances All AXlink devices require a minimum of 12 VDC power to operate properly. [. . . ] If the installation site's wiring conforms to EIA/TIA 568 Category 3 standards, AXlink data communication will function properly. However, power (PWR) cannot be used with EIA/TIA 568-Category 3 standard cable because of connector types and punch blocks. 5 shows a wiring diagram for Category 5-compliant cable used for AXlink data communication. The PWR connection shown in the wiring diagram is only used when supplying 12 VDC via the AXlink cable. [. . . ]