命令名称：read_device_variable_information

命令ID：1057

命令号：54

命令操作：cmdOpRead

命令中事务个数：1

事务列表

    事务号：0

    事务中请求数据列表

条目类型	标识	掩码	整数	浮点	变量ID
cmdDataFlags	cmdDataItemFlg_indexNinfo	0	0	0	device_variable_code

    事务中响应数据列表

条目类型	标识	掩码	整数	浮点	变量ID
cmdDataReference	cmdDataItemFlg_None	0	0	0	response_code
cmdDataReference	cmdDataItemFlg_None	0	0	0	device_status
cmdDataFlags	cmdDataItemFlg_indexNinfo	0	0	0	device_variable_code
cmdDataReference	cmdDataItemFlg_None	0	0	0	sensor_serial_number
cmdDataReference	cmdDataItemFlg_None	0	0	0	length_dig_units
cmdDataReference	cmdDataItemFlg_None	0	0	0	level_usl
cmdDataReference	cmdDataItemFlg_None	0	0	0	level_lsl
cmdDataReference	cmdDataItemFlg_None	0	0	0	time_constant
cmdDataReference	cmdDataItemFlg_None	0	0	0	level_min_span
cmdDataReference	cmdDataItemFlg_None	0	0	0	LevelClassification
cmdDataReference	cmdDataItemFlg_None	0	0	0	LevelFamily
cmdDataReference	cmdDataItemFlg_None	0	0	0	LevelUpdatePeriod