Thytronic NA60-MB0 PRON Series - 2.1.8 ARR

PRON NA60-MB0
Version 3.50
PRON NA60-MB0 Remote Setting Manual Page: 10 of 59
2.1.8 ARR
Description:
Array of BYTE.
Relationship with Modbus:
An ARR data type of length n is placed in N Modbus Registers (N= ceil(n/2)
†
) keeping the byte ordering. If odd n,
the last byte of ARR is placed in the MSB of the last Modbus register, while the LSB is set to 0
If even n:
B
1
B
2
B
n
B
1
B
2
B
n-1
B
n
1 2 n 1 N
Array[n] Modbus Registers
N = ceil(n/2)
If odd n:
B
1
B
2
B
n
B
1
B
2
B
n
0
1 2 n 1 N
Array[n] Modbus Registers
Example:
Let’s consider an array with 3 bytes whose values are: (0x01, 0x3A, 0x1F). This array can be placed in
N=ceil(3/2)=ceil(1.5)=2 Modbus registers.
01 3A 1F 01 3A 1F 00
1 2 3 1 2
Array[3] Modbus Registers
†
The ceil function returns the smallest integer value that is greater than or equal to a number. For example,
ceil(2.3)=3 , ceil(1.5)=2.