The development of an intelligent small paperless recorder

Inherited from the successful design of the large paperless recorder, the intelligent small paperless recorder has a modular structure. It also employs the same data acquisition module as the large paperless recorder does. It has a menu driven GUI (full Chinese language), eight multi-purpose input channels (all user configurable), 16-channel relay outputs and 2-channel analog outputs (V/mA). Though a MCS51 based MCU is used as the main controller, the limitations of 64K RAM and ROM of this kind of MCU have been conquered through page mapping and code banking technologies. The paper describes how to accomplish this breakthrough from the aspects of hardware and software design.