LEM EM4TII+ - Command and Data Formats

05November2020/V1.0 Page 15/33
4.2.2 Command and data formats
In chapter 4.2.1 an example of a data exchange was given. In the present chapter, all notions related to messages
needed for communication will be explained.
In chapter 4.2.9, a sample communication cycle with explanations is given to show the use of the messages.
Please note:
The EM4TII+ interface parameters are:
Baud rate: 9600 bps
Data bits: 7
Stop bit: 1
Parity: even
Message explanation generally:
/
?
→ Command character
1
5
→ Please find the related explanation
after the message descriptions.
Request message
/
?
Device address
!
CR
LF
1
9
20
2
3
Identification message
/
X
X
X
Z
Ident
CR
LF
1
11
12
13
3
Acknowledgement/option select message
ACK
0
Z
Y
CR
LF
4
*)
12
10
3
*) always “0”
Data message (except in programming mode)
STX
Data
!
CR
LF
ETX
BCC
5
14
2
3
6
8
Data message (in programming mode)
STX
Data
ETX
BCC
5
18
6
8
Data message (in programming mode with
optional partial blocks)
STX
Data
EOT
BCC
5
18
7
8
Command sequence
Command sequence
Answer f. EM4TII+
Answer f. EM4TII+
Answer f. EM4TII+
Answer f. EM4TII+