User Manual of EM760 High-Performance Inverter 3.3.8 Standard Wiring Diagram of Control Circuit Fig. 3-23 Standard Wiring Diagram of Control Circuit 3.4 Extension wiring of keyboard 1) The external keyboard port is an RJ45 port, with an ordinary network cable (plug connection according to EIA/TIA568B) used as the extension line. 2) Connect RJ45 port of the keyboard to RJ45 port on the keyboard mounting plate by using a network cable. 3) The keyboard extension cable should be no longer than 30m. When Cat5E wire is used in sound electromagnetic environments, an extension cable of up to 50m may be purchased from the company. 59