
Possible message formats
Return of datas:
STX
X..X
ETX
BCC
Positive acknowledge:
ACK
Negative acknowledge (Errors):
NAK
Reasons of a negative acknowledge (Errors):
• command is unknown
• datas are wrong (to short or to long)
• datas contains wrong signs
• datas lies out of the value range
• wrong control byte
2. Communications protocol
ERMA-Electronic GmbH
6
Содержание SSI 9001
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