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For the reason that the maximum numbers of registers that one definition can access is 125, use
multiple definitions to reserve a larger register space if needed.
Reserve enough register space in the first stage
Add reserve definitions with minus sign in the first field, COM port and the amount of reserved
registers, the MDCL will assign local registers for data defined in the definition but not poll data.
(Refer to sec. 6.2)
Use the reserved registers in subsequent applications
Edit new polling definitions for reading data from newly added devices, and subtract the total number
of registers used in these definitions from the number of previous reserved registers.
Adds polling definitions for reading data from newly added iSN-201-E
Adjusts the value for keeping a fixed number
of registers of a COM port
Minus sign
Specifies COM port for which the space is reserved.
Specifies the amount of reserved registers
