AquaTrans™ AT600 User’s Manual 113Chapter 6. CommunicationCommand 145 (0x91): Read Density Value (cont.)Command 146 (0x92): Read Backlight SettingThis command is to read the backlight setting.Table 30: Response Data Bytes for Read Density ValueByte Format Description0 Unsigned-8 Density type:1: Actual Density;2: Reference Density;1 Unsigned-8 Density Unit Code2 - 5 Float Density valueTable 31: Command-Specific Response Codes for Read Density ValueCode Class Description0 Success No Command-Specific Errors1 Undefined2 Error Invalid Selection3-4 Undefined5 Error Too Few Data Bytes Received6 Error Device-Specific Command Error7-127 UndefinedTable 32: Request Data Bytes for Read Backlight SettingByte Format DescriptionNoneTable 33: Response Data Bytes for Read Backlight SettingByte Format Description0 Unsigned-8 Backlight control switch (0:off/ 1:on)1 - 4 Unsigned-32 Display backlight timeout, unit is second.