A I 1.1
= DB3.DBX 2.1
AN I 1.0
A DB3.DBX 2.1
O
A I 1.0
AN DB3.DBX 2.1
= DB3.DBX 2.0
AN I 0.7
A DB3.DBX 2.0
O
A I 0.7
AN DB3.DBX 2.0
= DB3.DBX 3.7
AN I 0.6
A DB3.DBX 3.7
O
A I 0.6
AN DB3.DBX 3.7
= DB3.DBX 3.6
AN I 0.5
A DB3.DBX 3.6
O
A I 0.5
AN DB3.DBX 3.6
= DB3.DBX 3.5
AN I 0.4
A DB3.DBX 3.5
O
A I 0.4
AN DB3.DBX 3.5
= DB3.DBX 3.4
AN I 0.3
A DB3.DBX 3.4
O
A I 0.3
AN DB3.DBX 3.4
= DB3.DBX 3.3
AN I 0.2
A DB3.DBX 3.3
O
A I 0.2
AN DB3.DBX 3.3
= DB3.DBX 3.2
AN I 0.1
A DB3.DBX 3.2
O
A I 0.1
AN DB3.DBX 3.2
= DB3.DBX 3.1
AN I 0.0
A DB3.DBX 3.1
O
A I 0.0
AN DB3.DBX 3.1
= DB3.DBX 3.0
这是一段并行接口编码器记步的程序，怎么也搞不懂它的原理，请高手指教！（初次接触编码器）