77
CompoWay/F Message Communications
Section 4-5
An end code is returned for each command block addressed to the local node.
A response is not returned if the characters in the response block are incom-
plete up to the ETX and BCC. The error detection priority indicates the order
by which errors are detected when multiple errors occur simultaneously.
Note
1.
Noise interference may prevent a response being returned or cause an er-
ror response to occur. Always perform retry processing from the master if
noise interferes with responses.
2.
The response time after sending a command can be as much as 6 s. If a
response has not been returned, wait 6 s before sending the next com-
mand.
Examples of End Codes
when Errors Occur
The following examples show an end codes for commands that did not end
normally.
Example 1: Illegal Sub-address, No SID, and No Command Text
The end code is 16 (sub-address error). This end code is used because the
sub-address was received and the error detection priority of a sub-address
error is higher than a format error.
Example 2: No Command Text
“13”
BCC error
Received an incorrect BCC value.
5
“14”
Format error
• The command text contains characters
other than 0 to 9, or A to F. (This error
is not applicable to the echoback test.)
• No SID and command text.
• No command text.
• No MRC/SRC included in command
text.
7
“16”
Sub-address error
• Received a block with an unsupported
sub-address.
• No sub-address, SID, and command
text.
• Sub-address is less than two charac-
ters, and there is no SID and command
text.
6
“18”
Frame length error
The received frame length exceeds the
fixed number of bytes.
4
End
code
Name
Description
Error
detection
priority
STX
Node number
Sub-address
ETX
BCC
02 Hex
03 Hex
“A”
“0”
Command Block
Response Block
STX
Node number
Sub-address
02 Hex
“1”
“A”
“0”
“6”
03 Hex
ETX
BCC
End code
STX
Node number
Sub-address
SID
ETX
02 Hex
“0”
“0”
“0”
Command Block
Response Block
STX
Node number
Sub-address
End code
02 Hex
“1”
“0”
“0”
“4”
03 Hex
ETX
BCC
BCC
03 Hex
Summary of Contents for E3X-CIF11
Page 3: ...iv...
Page 21: ...10 Connecting Fiber Amplifier Units Section 1 3...
Page 63: ...52 Setting Monitoring and Operating Sensors from the DeviceNet Configurator Section 2 7...
Page 107: ...96 CompoWay F Message Communications Section 4 5...
Page 125: ...114 Monitoring Incident Light Levels of E3X DA6 P Sensors Appendix B...
Page 133: ...122 DeviceNet Connection Settings Appendix C...
Page 135: ...124 DeviceNet Device Profile Appendix D...
Page 137: ...126 Revision History...