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3. Group read and write registers together in the programmable pointer list
and access them with separate Modbus commands. The ETH-100 can
process read requests and write requests faster when they are grouped together
rather than the master having to issue multiple transactions to access disjoint
registers. This is especially true when the registers to be accessed are also
configured as ASD scan registers. Pointer registers can be accessed in any
combination of starting register and length. In the setup below, you would
optimize ETH-100 efficiency by having two Modbus transactions: one read
request with a length of 6 starting at register FC00, and one write request with a
length of 2 starting at register FC08.
Table 5: Grouping Read and Write Registers In The PPR List
Modbus Pointer Registers
(Also configured to be ASD READ
scan registers)
Modbus Pointer Registers
(Also configured to be ASD
WRITE scan registers)
Register Points To… Register Points To…
FC00 FE03 FC08 FA02
FC01 FE06 FC09 FA01
FC02 FD01 FC0A
FC03 FE02 FC0B
FC04 FC91 FC0C
FC05 FE04 FC0D
FC06 FC0E
FC07 FC0F