邮件已经收到了，可是对IFIX操作系统我这边没有接触过，所以，如果可能的话，我们可以多交流。

R应该表示寄存器的意思。

Modbus Register Map (cont’d)
Format (R40,062)
This value determines the format of all unsigned, double-register integers (UINT32),
except for those in the direct parameter access.
0 indicates that the most significant byte (MSB) is given first
1 indicates that the least significant byte (LSB) is given first
For more information on this data format see page 131
Device Identifier (R40,064)
This value identifies the Milltronics device type and is “2” for the BW500.



Primary Index
The primary index is implicit in the memory address. MPA values are
returned through registers 40022 to 40031 of the register map (see page
27).
register index
40022 1
40023 2
40024 3
40025 4
40026 5
40027 6
40028 7
40029 8
40030 9
40031 10
Secondary Index
The secondary index for the requested parameter is specified in register
40033.