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UF3300 Modbus
Subcommand 00 allows a simple echo function to be performed. This is
a good way to ensure that the unit's communications are in good order.
If there is reason to suspect that the communications link is being
corrupted by a faulty unit, then subcommand 04 should be used to take
the suspect unit offline. Issues may then be addressed. After
subcommand 04 is issued, the unit will ignore all commands but one.
The only command / subcommand that the Modbus board will respond
to after being taken offline, is DIAGNOSTICS (command 8), sub
command 01, which will restart the communications link. Provided any
issues found have been addressed, after a couple of seconds the unit
should be back online again.
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