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    Monterey Powerline Signal Analyzer (PLSA) — Mode Operation Guide

    September 08, 2026 3 min read

    Operation guide for the Monterey Powerline Signal Analyzer (PLSA) — a diagnostic tool for troubleshooting X10 signals on AC power lines, with five operating modes.

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    Full text manual (for reference)

    Operation guide for the Monterey Powerline Signal Analyzer (PLSA) — a diagnostic tool for troubleshooting X10 home automation signals on AC power lines. The PLSA has five operating modes, selected via the front-panel MODE button.

    How Mode Selection Works

    Press the MODE button on the front panel to switch between modes. After pressing the button the required number of times, the PLSA switches to that mode.

    Mode 1 — X10 Signal Identifier & Signal Strength Indicator

    When plugged into any 120VAC outlet, the display shows "X-10 Code:" and "Signal Strength:". If not, press the mode button once. Any X10 code received is displayed on the top line with its signal strength in volts or millivolts underneath. As each code is received, the entire LCD display shifts from right to left.

    • Top line shows the house code, device code, and function code
    • Bottom line shows peak-to-peak signal strength in volts (auto-ranging, 0 millivolts to 4.1 volts)
    • An "m" indicator (for millivolts) means the signal is less than 0.1 volts (100 millivolts)

    Error Codes

    These codes display when a received X10 code is corrupted or noise is present:

    Code Meaning
    BSC Bad Start Code. Often occurs when a noise spike is strong enough to translate as a binary 1 at one zero-crossing but absent at the next. Can also occur with weak threshold signals or code collisions from simultaneous transmissions.
    BBK Bad Block. Displayed when an X10 code has a good start code, but its two 11-cycle blocks are not identical, or a true bit and its complementary bit in a block are not opposite.
    BCY Bad Cycle Gap. Displayed when there are fewer than 3 complete "silent" AC power cycles between two different X10 codes (X10 transmission requires at least 3 silent cycles between codes).
    Lowercase house code letter Appears if only one good start code and one good block (of two identical blocks) are received from an X10 transmission.

    Mode 2 — Displaying AC Power Line Noise

    Press the mode button twice. The display shows noise levels on the AC power line within the first millisecond after zero-crossing — the peak voltage or highest amplitude of noise with frequencies of 110 KHz or greater that occurred during the previous second.

    Mode 3 — Dissecting X10 Codes

    All signal strengths of the 22 cycles of the last X10 code received (while in Mode 1) are permanently stored in memory for later review. Press the mode button once; after an X10 code is received and displayed, press the mode button three times to dissect the last code received in detail. Each code can be dissected to display both code bits of each cycle — the true bit displayed first, followed by its complementary bit, with signal strengths shown directly below.

    Modes 4 & 5 — X10 History Recorder

    The PLSA can record up to 190 incoming X10 codes in permanent memory, along with their signal strength and an offset time (in hours) from when they occurred.

    • Pressing the mode button 5 times resets the history recorder — clearing all past recorded X10 events and the internal timer.
    • As X10 codes are received, they display in order along with their signal strength and the time (in hours) since the history recorder was last reset.