What is the difference between SK protocol and SD protocol on the 5820XL, and can they be mixed?
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The 5820XL supports either SK protocol or SD protocol, but they cannot be mixed on the same system (Page 91) [6].
SK devices use rotary dials for addressing and allow detectors and modules to share address numbers 1-99, supporting a total system capacity of 792 points (396 detectors and 396 modules) (Page 98) [1], (Page 73) [6].
In contrast, SD devices use EEprom addressing with unique addresses 1-127 for all devices and support a maximum of 508 total points (Page 98) [1], (Page 73) [6].