7-22
7-5 Setting the Communications Data
Thefollowingdescriptionprovidesinformationonhowtoconverttheregis-
terdata(suchasmonitorvalueorparametersetvaluedata)inthecommu-
nications data block of the message data (such as DSR and response
data).
H Converting the Register Data
·The data in each register is sent as 2-byte data.
·The data in each registerisprocessedunder the following rulesand sentin hexadeci-
mal.
D The data is converted to a hexadecimal value based on the minimum
unit of setting of each register as 1.
If the frequency reference is 60 Hz and the minimum unit of setting will
be 0.01 Hz, the data will be converted as follows:
60 (Hz)/0.01 (Hz) = 6000 = 1770 Hex
Note 1. The minimum unit of setting of each parameter is indicated whenever the
parameterisexplainedinthismanualandinSection 10 List of Parameters.For
registers other than those of parameters, refer to 7-6 Register Number Alloca-
tions in Details.
Note 2. The minimum unit of setting of frequency reference data or frequency monitor
data is determined by n152 (register 0198 Hex: RS-422/485 communications
frequency reference/monitor unit selection). The unit of setting of each of the
three registers below is determined by the set value in n152. For the units of
settingoftheseconstants,refertotheList of Parameters.Thesetvalueinn152
has nothing to do with frequency data items set as parameter constants (e.g.,
frequencyreferences1through16,inchingfrequencyreference,maximumfre-
quency, minimum output frequency, jump frequency).
S Monitor Items
Register 0023: Frequency reference monitor
Register 0024: Output frequency monitor
S Communications-dedicated Register
Register 0002: Frequency reference
Inspiteofthesetvalueinn152,however,setthemaximumfrequencyto3000when
the frequency reference is executed with a broadcast message. In this case, the
Inverter rounds off any value less than 0.01 Hz.
Communications Chapter 7
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