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Push 3 error indicators onto the stack (simultaneous capture, to avoid timing hazards), and reset the error count to 0:
Z = Err Address
This is the address of the most recent remote device that caused or reported an error.
Y = Err Code
This is the code of the most recently generated communications error. The error code depends on the protocol. Codes are documented under each protocol, e.g. ModBus.
X = Error count
How many errors have be recorded since the counter was reset. This is an 8-bit number that will count up to 255 then stop counting.
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