Service manual

www.enc.net.cn/en Tel/Fax:[phone] Appendix 3 Serial port RS485 communication protocol
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1.2.4 Data command frame format
Main device command frame format
sending
order
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
frame head
auxiliary device address
auxiliary device address main device command main device command assistant index assistant index command index command index set data set data set data set data checkout sum checkout sum checkout sum checkout sum frame end
Definit-
ion
head address
command
area
Index area setting data area checkout area end
sending
b
yte
1 2 2 4 4 4 1
Auxiliary device response frame format
sending
order
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
frame head
auxiliary device address
auxiliary device address
auxiliary device reponse auxiliary device reponse
failure index failure index command index command index run data run data run data run data checkout sum checkout sum checkout sum checkout sum frame end
Definiti-
on
head address
reponse
area
Index area Run data area Checkout area
end
sending
by
te
1 2 2 4 4 4
1
Fig.2 command/response frame format