The toxic gases

such as H2S

CH4

CO

etc

are major hazard during underground coal mining operation in terms of both safety and productivity

at the same time

it brings huge hidden danger to miners

life security.Gas explosion

poisoning

flooding accidents happen from time to time

accurate monitoring and pre-alarm can avoid occurrence of accidents effectively.Therefore

a kind of communication network based on CAN bus which hanging different sensors

for example

H2S gas sensor

double gas（CH4

CO） sensor

temperature-humidity sensor etc in its nodes is designed

which are used to monitor toxic gas volume fraction

temperature

humidity and other environmental parameters real-time in industrial filed underground coal mine.This monitoring system run well in laboratory simulation circumstance experiment

has high flexibility and good migration so it can be directly applied in monitoring of underground coal mine.