读。例如:开始点编号字段=%Q0007,所以开始地址是%Q0008点数字段=16(0010h),所以地址%Q0008到%Q0023将被读错误校验字段错误校验字段有两字节长，包含一个循环冗余校验(CRC-16)代码。它的值是–个局地址内容的功能、功能代码和信息字段。产生CRC-16代码的详细资料在13-28页“循环冗余校验”中描述。注意信息字段长度是一-个变量。为了正常产生CRC-16代码，帧长必须确定。关于计算每种定义过的功能代码的帧长，见13-31页“计算帧长”。
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GE Y Wound Motor 5K49FN4135, 1/3 HP, 1725 RPM, 3PH #634
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Mosier Norgren F74G-4AN-AD1 Lubricator #10512
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Lucifer Solenoid Valve Coil 48 1865A5 F #33903
