Make I/V transform for the current signal of 4~20mA coming from adjustor, then make A/D transform for the signal received just now.

• 对从调节器送来的4一20mA电流信号进行I瓜转换，同时对转换后的信号进行A/D转换; 对经电位器反馈回来的阀位信号进行刀D转换。