The card USES both inquiry mode and interruptmode.
本接口卡采用中断、查询相结合的方式。
2
An interrupt management module was also built in, it enables the interface to work on either query mode or interruptmode.
内建中断管理模块，可以工作在查询模式或中断模式。
3
The data acquisition circuit is composed of chip 89C52 and 8254. External measuring signal at interruptmode triggers 89c52 to read number in 8254 counter.