方法名称： ejx_method_modify_engr_unit

方法ID： 0x4150

方法标签： Modify Engr Unit

方法描述： Modify engineering unit- Modifies the engineering unit or sets a customized engineering unit. Enter a series of up to eight alphanumeric characters, spaces, or slashes (only first six characters are shown on LCD). Note that if you already select the unit at 'Set Engineering Unit,' the unit appears as a default. Then re-enter the unit but enter a space instead of a character to display the character in lowercase on LCD. For example, in order to show 'aBCd' on LCD, enter 'ABCD' first, then enter '_BC_'.