Easy RJ45 Wiring (with RJ45 pinout diagram, steps and RJ45 pinout diagram shows wiring for standard T568B, T568A and crossover cable! CLICK to check the right one for you or print as reference. See recommended tools. Remember the RJ45 wiring order. THE complete Ethernet pinout cable wiring reference with wiring step-by-step guide. CLICK to Thermostat Wiring Diagrams Quality HVAC Guides 101 That is a basic Honeywell thermostat wiring diagram for a single-stage heat pump. If you have a two-stage heat pump, then you will also utilize terminal Y2 for the second stage. Furthermore, this thermostat wiring diagram is specifically for a system with two transformers system likely only has one transformer, as most typical residential systems only use a single transformer for control.