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2812的scib,485通讯

我用的2812的scib通讯,RS485,modbus协议,FIFO中断方式,用了01和03两个功能码,01功能码总共19个字节,前面16个字节电脑能收到,后面3个字节电脑收不到,03功能共37个字节,前面32字节电脑能收到,后面5个字节电脑收不到,请问是什么原因?