－17－
5.3.5.2 Calculation of LRC
The data from its slave address to its end is calculated in the following procedure.
1) Create a message in RTU mode.
2) Add the start (slave address) to end of the data. -- X
3) Complement X (bit reverse) -- X
4) Add 1 (X = X + 1)
5) Add X as an LRC to the end of the message.
6) Convert the whole data to ASCII characters.
Example) For the data 02H 07H , LRC is F7H which will be 02H
07H
E7H as a binary message,
so that the ASCII message will be 30H 32H
30H
37H
46H
37H .
5.3.6 Precautions on data processing
(1) Since the measured data and decimal places are assigned to separate numbers, it is necessary to use
both parts of the information when playing back the data.
(2) Since data is accessible (changeable) one by one, care must be taken when programming related data,
for instance when initializing related data by changing the range number. Processing details are given in
the Reference No. list.
(3) Read or write the data within the range of Reference Nos. specified. If data is written on any Reference
No. not specified, it is likely to affect the proper operation of the instruments.
(4) While it is possible to write data on two or more discreet Reference Nos., a start number with Reference
No. not specified will result in an error (error No. 02H).
(5) When reading two or more Reference Nos., the data with Reference No. not specified becomes "0".
(6) When an error is detected during writing on two or more Reference Nos., all the programming becomes
invalid.
