Festo Электромотор MTR-DCI - Manual (Page 147)

B. Supplementary information
B-11
Festo P.BE-MTR-DCI-IO-EN en 1209d
All values are transferred in hexadecimal figures; 1 character
represents 4 bits; it is known as a tetrad . The first tetrad
transferred contains the higher-value bits of the value.
General information: Tetrad contains the bits b
n ...b n+3 .
Example: UINT8
Dec. 26
Hex 1 A
Bin 0 0 0 1 1 0 1 0
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
Tetrad T
4
Tetrad T
0
Checksum The checksum is formed from the sum of all sent bytes and
shortened to 1 byte (modulo 256).
The other station must compare the sent command with the
“ecco” of the controller and process the checksum.
Checksum
Syntax IIIISS:
Format 2 hexadecimal figures
Type UINT8