3-13
IM 04P01B01-17E
3
Using the RS-422A/485 Communication Interface (/C3 Option)
(From previous page)
40325 Communication input data of C13 (lower word)
40326 Communication input data of C13 (upper word)
40327 Communication input data of C14 (lower word)
40328 Communication input data of C14 (upper word)
40329 Communication input data of C15 (lower word)
40330 Communication input data of C15 (upper word)
40331 Communication input data of C16 (lower word)
40332 Communication input data of C16 (upper word)
40333 Communication input data of C17 (lower word)
40334 Communication input data of C17 (upper word)
40335 Communication input data of C18 (lower word)
40336 Communication input data of C18 (upper word)
40337 Communication input data of C19 (lower word)
40338 Communication input data of C19 (upper word)
40339 Communication input data of C20 (lower word)
40340 Communication input data of C20 (upper word)
40341 Communication input data of C21 (lower word)
40342 Communication input data of C21 (upper word)
40343 Communication input data of C22 (lower word)
40344 Communication input data of C22 (upper word)
40345 Communication input data of C23 (lower word)
40346 Communication input data of C23 (upper word)
40347 Communication input data of C24 (lower word)
40348 Communication input data of C24 (upper word)
Hold register Data
• Registers corresponding to models with the /M1 computation function option.
• Pen model: C01 to C08; Dot model: C01 to C12 (µR10000), C01 to C24 (µR20000)
• The data is a floating point.
• When writing to the register: The values that can be input are −9.9999E29 to −1E−30, 0,
and 1E−30 to 9.9999E29.
If a value exceeding this range is input, a computation error will occur when using the value
on computation channels.
Modbus Error Response
The recorder returns the following error codes to the master device. For the error
messages related to communications that the recorder displays, see appendix 4.
Code Meaning Cause
1 Bad function code Unsupported function request.
2 Bad register number Attempted to read/write to a register that
has no corresponding channel.
3 Bad number of registers The specified number of registers is less
than or equal to 0 or greater than or
equal to 126 (when reading)/124 (when
writing).
However, no response is returned for the following cases.
• CRC error
• Errors other than those in the table above.
3.4
Modbus Slave Specifications
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