CD Automation STE Series, User Manual

Page: 53 / 54

CD Automation srl STE Soft Starter User’s Manual
53
12.4 Read Holding Registers
This function reads the instantaneous value of a specified number of parameters from an address.
The message is composed by 8 Byte: one Byte is for the address, one for the function (03 Hex), two
Byte for the first parameter to read, two Byte for the total number of parameters to read and finally two
Byte for the CRC:
Address
Unit
Function
Address of the First
Parameter
N° of the Parameter CRC 16
3
3Hex
HI LO HI LO LO HI
The answer is an echo of the first two Byte (address and function), one byte with the number of
following byte to exclusion of the CRC, the demanded values and finally two Byte for the CRC:
Address
Unit
Function N° of Byte First Parameter
Value
Last parameter
value
CRC 16
3
3Hex
HI LO … HI LO LO HI
12.5 Preset Multiple Registers
This function could write only a parameter for each message.
The message is composed by 11 Byte: one Byte for the address, one for the function (10 Hex), two Byte
for first parameter to write, two Bytes for the N° of parameters, fixed to 1 (0001 Hex), one Byte with the
number of following Bytes, fixed to 2 (02 Hex), two Byte for the CRC:
Address
Unit
Function
Address of the
First Parameter
N° of the
Parameter
N° of
Byte
Value to
write
CRC 16
16
10Hex
HI LO 0 1 2 HI LO LO HI
The answer is an echo of the first two Byte (address and function), two Byte for first written parameter,
two Byte with the N° of parameters, fixed to 1 (0001 Hex), two Byte for the CRC:
Address
Unit
Function Address of the First
Parameter
N° of the
Parameter
CRC 16
16
10Hex
HI LO 0 1 LO HI