The front panel LED (Light Emitting Diode) OK LED: indicates 3500 / 40M uptime TX / RX LED: indicates 3500 / 40M is working with the other modules in the 3500 rack communications Bypass LED: indicates 3500 / 40M is in bypass mode sensor buffered output: front panel corresponding to each channel has a BNC connector, BNC connectors are each short-circuit protection Empire Shenyang Automation Equipment Co., Bentley sold product, the following brief 3500/53 overspeed detection module's front panel LEDOK LED: indication 3500/53 module is normal TX / RX (transmit / receive) LED: indicates the 3500/53 module is working with other modules in the 3500 rack communications Bypass (Bypass) LED: indicates the 3500/53 module is in bypass mode Test Mode (test mode) LED : Indicates 3500/53 module under test Alarm (Alarm) LED: indicates an alarm condition has occurred, the relay contact has a motion sensor with a buffer. Bentley monitoring module Shenyang Empire, Bentley Keyphasor module, Bentley provided by the Shenyang Automation Equipment Co., Ltd. Empire. Empire Shenyang Automation Equipment Co., Ltd. (www.syepe.net) located Tiexi District of Shenyang Xinghua North Street 18 A 1404. Scraps and development in the wave of market economy, the current Empire Shenyang Automation Equipment Co., Ltd. has a high reputation in the industrial automation control systems and equipment, and enjoys a good reputation. Empire Shenyang Automation Equipment Co., Ltd. made the whole network business alliance certification, marking our service and management level has reached a new height. Empire Shenyang Automation Equipment Co., Ltd. all employees willing to work with all people of insight and common development, for a better future.