关于校验码(100分)

公司的老程序，没有源代码和文档，不过通过监听串口得到了通讯字符串，我只改变其中的一个字节，校验码也跟着变了，但是不知道校验码的算法，高手请帮我看一看。（最后两个字符是校验码）
#00W001400000000000000000000000000000000000000000071
最后两个00 是变化字符
71 是校验码
#00W001400000000000000000000000000000000000000000071
#00W001400000000000000000000000000000000000000000170
#00W001400000000000000000000000000000000000000000273
#00W001400000000000000000000000000000000000000000372
#00W001400000000000000000000000000000000000000000475

#00W001400000000000000000000000000000000000000000574
#00W001400000000000000000000000000000000000000000677

#00W001400000000000000000000000000000000000000000776

#00W001400000000000000000000000000000000000000000879

#00W001400000000000000000000000000000000000000000978

#00W001400000000000000000000000000000000000000000A00

#00W001400000000000000000000000000000000000000000B03

#00W001400000000000000000000000000000000000000000C02

#00W001400000000000000000000000000000000000000000D05

#00W001400000000000000000000000000000000000000000E04

#00W001400000000000000000000000000000000000000000F07

#00W001400000000000000000000000000000000000000001070

#00W001400000000000000000000000000000000000000001171
#00W001400000000000000000000000000000000000000001272
#00W001400000000000000000000000000000000000000001373
#00W001400000000000000000000000000000000000000001474

#00W001400000000000000000000000000000000000000001575

#00W001400000000000000000000000000000000000000001676

#00W001400000000000000000000000000000000000000001777

#00W001400000000000000000000000000000000000000001878

#00W001400000000000000000000000000000000000000001979

#00W001400000000000000000000000000000000000000001A01

#00W001400000000000000000000000000000000000000001B02

#00W001400000000000000000000000000000000000000001C03

#00W001400000000000000000000000000000000000000001D04

#00W001400000000000000000000000000000000000000001E05

#00W001400000000000000000000000000000000000000001F06

#00W001400000000000000000000000000000000000000002073

#00W001400000000000000000000000000000000000000002172

#00W001400000000000000000000000000000000000000002271

#00W001400000000000000000000000000000000000000002370

#00W001400000000000000000000000000000000000000002477

#00W001400000000000000000000000000000000000000002576

#00W001400000000000000000000000000000000000000002675

#00W001400000000000000000000000000000000000000002774

#00W00140000000000000000000000000000000000000000287B

#00W00140000000000000000000000000000000000000000297A

#00W001400000000000000000000000000000000000000002A02

#00W001400000000000000000000000000000000000000002B01

#00W001400000000000000000000000000000000000000002C00

#00W001400000000000000000000000000000000000000002D07

#00W001400000000000000000000000000000000000000002E06

#00W001400000000000000000000000000000000000000002F05

#00W001400000000000000000000000000000000000000003072

#00W001400000000000000000000000000000000000000003173

#00W001400000000000000000000000000000000000000003270

#00W001400000000000000000000000000000000000000003371

#00W001400000000000000000000000000000000000000003476

#00W001400000000000000000000000000000000000000003577

#00W001400000000000000000000000000000000000000003674

#00W001400000000000000000000000000000000000000003775

#00W00140000000000000000000000000000000000000000387A

#00W00140000000000000000000000000000000000000000397B

#00W001400000000000000000000000000000000000000003A03

#00W001400000000000000000000000000000000000000003B00

#00W001400000000000000000000000000000000000000003C01

#00W001400000000000000000000000000000000000000003D06

#00W001400000000000000000000000000000000000000003E07

#00W001400000000000000000000000000000000000000003F04

#00W001400000000000000000000000000000000000000004075

#00W001400000000000000000000000000000000000000004174

#00W001400000000000000000000000000000000000000004277

#00W001400000000000000000000000000000000000000004376

#00W001400000000000000000000000000000000000000004471

#00W001400000000000000000000000000000000000000004570

#00W001400000000000000000000000000000000000000004673

#00W001400000000000000000000000000000000000000004772

#00W00140000000000000000000000000000000000000000487D

#00W00140000000000000000000000000000000000000000497C

#00W001400000000000000000000000000000000000000004A04

#00W001400000000000000000000000000000000000000004B07

#00W001400000000000000000000000000000000000000004C06

#00W001400000000000000000000000000000000000000004D01

#00W001400000000000000000000000000000000000000004E00

#00W001400000000000000000000000000000000000000004F03

#00W001400000000000000000000000000000000000000005074

#00W001400000000000000000000000000000000000000005175

#00W001400000000000000000000000000000000000000005276

#00W001400000000000000000000000000000000000000005377

#00W001400000000000000000000000000000000000000005470

#00W001400000000000000000000000000000000000000005571

#00W001400000000000000000000000000000000000000005672

#00W001400000000000000000000000000000000000000005773

#00W00140000000000000000000000000000000000000000587C

#00W00140000000000000000000000000000000000000000597D

#00W001400000000000000000000000000000000000000005A05

#00W001400000000000000000000000000000000000000005B06

#00W001400000000000000000000000000000000000000005C07

#00W001400000000000000000000000000000000000000005D00

#00W001400000000000000000000000000000000000000005E01

#00W001400000000000000000000000000000000000000005F02

#00W001400000000000000000000000000000000000000006077

#00W001400000000000000000000000000000000000000006176

#00W001400000000000000000000000000000000000000006275

#00W001400000000000000000000000000000000000000006374

#00W001400000000000000000000000000000000000000006473

#00W001400000000000000000000000000000000000000006572

#00W001400000000000000000000000000000000000000006671

#00W001400000000000000000000000000000000000000006770

#00W00140000000000000000000000000000000000000000687F

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#00W001400000000000000000000000000000000000000006A06

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#00W001400000000000000000000000000000000000000006E02

#00W001400000000000000000000000000000000000000006F01