In an exemplary embodiment, a serial port of the test station computer 52 is connected to a serial port of the electronic controller of the spa 1 through a voltage level shifting adapter 80. The adapter 80 converts between RS-232 signal levels of the computer serial port and SPI protocol TTL signal levels which are compatible with the microcomputer comprising the electronic controller of the spa. In an exemplary embodiment, the adapter module 80 can include a MAX 232 RS-232 driver receiver device, marketed by Maxim, or an equivalent, for performing the level shifting. For some applications, the adapter 80 may be omitted, e.g. in a design in which the TTL conversion is performed on the controller board of the spa, and RS-232 signals are communicated between the test station computer and an RS-232 port on the spa controller board. A serial data stream can be passed between the computer and the spa controller, allowing data and commands to be passed from the computer to the spa controller, and for status and other data to be passed from the spa to the computer 52.
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