Omron E3X-CIF11, Operation Manual

Page: 87 / 138

76
CompoWay/F Message Communications Section 4-5
BCC Calculation Example
Response Block
The response end codes are as follows:
STX This code (02 Hex) indicates the beginning of the communica-
tions block.
Always set these characters in the first byte.
When STX is received again during reception, reception is
repeated from the point where STX was received.
Node number This number specifies the transmission destination.
Specify an E3X-CIF11 CompoWay/F node number.
Sub-address This is not used for the E3X-CIF11. Always set the sub-
address to “0”.
SID (Service ID) This is not used for the E3X-CIF11. Always set the service ID
to “00”.
Command text This is the command text area.
ETX This code (03 Hex) indicates the end of the text.
BCC Block Check Character
The BCC result is obtained by calculating an exclusive OR
(XOR) of the bytes from the node number up to the ETX.
02
Hex “0”
(30 Hex)
“0”
(30 Hex)
“00”
(3030 Hex)
“0”
(30 Hex)
“30053001”
(3330303533303031 Hex)
03
Hex 37
Hex
STX
Node number Sub-address SID
Command text ETX
BCC
The calculation result 37 Hex
is set as the BCC.
BCC = 30 Hex + 30 Hex + 30 Hex + 30 Hex + 30 Hex + 33 Hex + 30 Hex +
30 Hex + 35 Hex + 33 Hex + 30 Hex + 30 Hex + 31 Hex + 03 Hex = 37 Hex
The “+” indicates an exclusive OR (XOR).
STX
(
™
10
1
) (
™
10
0
)
Node number
“00”
(fixed)
Sub-address
MRC
End code
02 Hex
(fixed)
Command text ETX BCC
03 Hex
(fixed) SRC
1 byte 2 bytes 2 bytes 2 bytes 1 byte 1 byte
End
code
Name Description Error
detection
priority
“00” Normal completion The command ended normally without
error.
None
“0F” Command error The specified command could not be exe-
cuted.
The response code should indicate why
the command could not be executed.
8
“10” Parity error A parity error occurred during reception of
one of the characters. 2
“11” Framing error A framing error occurred during reception
of one of the characters. 1
“12” Overrun error An overrun error occurred during recep-
tion of one of the characters. 3