The S661 shares an interrupt line between the RTC chip and the RS-485 transceiver. Code 41 means "Interrupt collision."
If you have landed on this page, you are likely holding a or a S661 Industrial Motion Controller , and you have realized the hard truth: the standard 50-page quick-start guide that ships in the box barely scratches the surface. s661 controller manual exclusive
LoopStart: NOP NOP NOP ... (x120) DJNZ R10, LoopStart // Decrement and jump if not zero The manual says DJNZ only works with registers R1-R5. It works with R10 through R15, but those registers aren't listed in the memory map. Chapter 6: Hardware Mods & The "Silent" Input Fix A common complaint in the official manual's FAQ is: "Inputs sometimes stay high when switch is open." The S661 shares an interrupt line between the
This information is for educational and advanced troubleshooting purposes. Always follow local safety codes. The "exclusive" methods described are based on field reverse engineering and community contribution. (x120) DJNZ R10, LoopStart // Decrement and jump