Omron E5CN Manual

2.1 Data Format
2-3
● BCC 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.
■ Response 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.
STX
SID ETX
BCC
02H 0 (30H) 0 (30H) 0 (30H) 0 (30H) 0 (30H) 0 (30H)5 (35H) 0 (30H)3 (33H) 03H 35H
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.
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 recep-
tion 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 the Echoback Test for details.)
• There was no SID and command text. There was no com-
mand 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) num-
ber of bytes.
4
BCC
STX 0 0 ETX
12 2 2 11
Node number Sub-address End code Command text

Omron E5CN Specifications

General

Brand	Omron
Model	E5CN
Category	Temperature Controller
Language	English