EL DC Instalation and operation manual v13.docx
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It is important to read the document Modbus Data Table.
0x03: READ_HOLDING_REGISTER
0x10: WRITE_MULTIPLE_REGISTER
Not used. Relayed on the TCP stack.
Only one master at one time allowed.
Additional connection requests might be delayed or even rejected.
Idle connections might be closed by the slave.
Anyway, the listen socket will force the master to keep the connection
active, even when there is no active connection at all.
All variables are 32-bit length. This is 2 Modbus base register addresses.
And so all Read operations must begin at the beginning of one variable,
and be Even.
For Write operations, ONLY 2 REGISTER WRITE OPERATIONS ARE
ALLOWED, i.e. only one variable (32 bits long) at one time.
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