The KJ76N-F2 for mining the Intrinsically Safe attendance points station mine under the miners more effective and reasonably simple attendance, I developed mine KJ76N-F2 Intrinsically Safe attendance sub-station, change attendance points standing underground support character LCD display information and real-time clock display, real-time monitoring of the the underground personnel hillock time; now downhole data input and transmission can be displayed in the host computer and print duty statements at any time, and around the point of entry within a day data; measurement sub-station to the offline work independently and store input data a month. Technical parameters: Operating voltage: DC12V ~ 21V. 2 wired communications: the sub-station and KJ76N-J mine with a communication interface between information transmission a) transmission mode: R485, master-slave asynchronous, half-duplex; b) transfer rate: 1200bps; c) communication signal peak - peak voltage : 1V ~ 10V; d) communication signal peak current: ≤ 20mA; e) the maximum transmission distance of 10 km. Data storage time is not less than 3 points standing communication interrupt 2h 4 backup power outage of the working time, the sub-station is powered by external KJ76N-F monitoring sub-station, continuous working time is not less than 2h. 5 remote control receiver Technical indicators: receiving distance: of 0 ~~ 10m; reception angle: 0 to 45. 6 officers detected the remote setting information capacity: support the attendance officer capacity: 65535; the support personnel detect data entry privileges personnel capacity: 36 people; maximum 20 can receive address information; personnel input data is classified by the shift display and save, save 20 points 60 trips of historical data; each shift data entry: 3 times; physical quantity of each shift entry: methane, carbon monoxide, temperature, carbon dioxide