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2 CompoWay/F Communications Procedures
E5@D Digital Temperature Controllers Communications Manual (H225)
2-1 D
ata F
o
rma
t
2
2-
1-2 BC
C
Calculation Example
The BCC (Block Check Character) is determined by calculating the exclusive OR of the bytes from the
node number up to ETX. The 8-bit result is written to the BCC byte at the end of the frame.
•
An end code is returned for each command frame received that was addressed to the local node.
•
No response will be returned unless the frame contained all elements up to the ETX and BCC.
•
“Error Detection Priority” indicates the priority when two or more errors occur simultaneously.
2-1-2
BCC Calculation Example
2-1-3
Response Frame
End code
Name
Description
Error detection
priority
00
Normal completion
The command ended normally without error.
None
0F
FINS command error
The specified FINS command could not be executed.
The FINS response code should indicate why the command
could not be executed.
8
10
Parity error
The sum total of bits whose received data is “1” does not
match the set value of the "communications parity" bit.
2
11
Framing error
Stop bit is “0.”
1
12
Overrun error
An attempt was made to transfer new data when the
reception data buffer was already full.
3
13
BCC error
The calculated BCC value is different from the received BCC
value.
5
14
Format error
•
The command text contains characters other than 0 to 9,
and A to F. This error does not apply to Echoback Tests.
(Refer to
2-3-7 Echoback Test
for details.)
•
There was no SID and command text. There was no
command text.
•
“MRC/SRC” not included in command text.
7
16
Sub-address error
•
Illegal (unsupported) sub-address
•
There was no sub-address, SID, and command text.
•
Sub-address was less than two characters, and there was
no SID and command text
6
18
Frame length error
The received frame exceeds the specified (supported)
number of bytes.
4
STX
02H 0 (30H) 0 (30H)
SID
0 (30H) 0 (30H) 0 (30H) 0 (30H) 5 (35H) 0 (30H) 3 (33H)
03H
35H
ETX
BCC
BCC = 30H+30H+30H+30H+30H+30H+35H+30H+33H+03H = 35H
Node number
Sub-address
Command text
The result of the calculation (35 hex) is written to the BCC byte.
The + symbols indicate XOR (exclusive OR) operations.
STX
0
0
ETX
1
1
1
2
BCC
2
2
Node number Sub-address End code
Command text
Summary of Contents for E5 D Series
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