PIC Based Subscriber Terminal Meter
AS7010 STmeter is PIC16F877-based project which is designed to provide a handheld installation tool to assist in the set-up and configuration of wireless DSL subscriber terminals operating in a point to multi-point configuration. The device allows the majority of installations to be carried out without the need for a laptop computer. This easy to use installation tool powered by two AA cells via a step up regulator or maintenance port of the Subscriber Terminal via a step down regulator.
When the STMeter is attached to the ST maintenance port, the UART is used to pass information to the main ST processor using a SLIP like protocol. The ADC operates in place of a voltmeter and allows the outdoor antenna unit to be aligned using the received signal strength. The received signal strength is displayed on STMeter as a bargraph which is much easier to use than the constantly flickering display of a Digital Voltmeter. Additionally the signal from the received signal strength pin is used to periodically pass additional information to STMeter by encoding the information using a 2B1Q coding scheme.
