Error detection
(1) EH-SIO hardware error
When EH-SIO detects serious error, operation is stopped. Try to push reset button in front panel or reboot the
power.
(2) Query error
When EH-SIO detects communication error (parity error, check code error, etc) or in received query, error code
will be stored, and the response will not be sent out. Since EH-SIO keeps operation, rebooting or resetting is not
necessary.
« Note »
EH-SIO does not send a response in case of error. Be sure to make fail-safe system like timeout in master side if
necessary.
(3) Exception response
If the slave receives the abnormal query like that the request is to read a non–existent coil or register, the EH-SIO
will return an exception response. In this case, EH-SIO does not stop the operation, and do not necessary to
reboot or reset.
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