Communications Data - Omron ZEN-8E Communications Manual

SECTION 2 CompoWay/F Communications Protocol
18 Frame length error
• 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.
• The Error detection priority is the priority when two or more errors occur simultaneously.

■ Communications Data

Communications Set (monitor)
protocol
CompoWay/F 8-digit hexadeci-
mal
Note: Refer to Read Time Data on page 28 and Write Time Data on page 29 for information on time
data.
● End Code Examples
Example 1
Example 2
12
The received frame exceeds the specified (supported) num-
ber of bytes.
Negative
values values
2's complement
The following examples describe end codes when an error is detected
in the command.
Illegal Sub-address, No SID, and No Command Text
Command
Node number Sub-address
STX
Response
Node number Sub-address End code
STX
The end code returned in the response is 16 (sub-address error). The
end code 16 is returned in the response when the sub-address error
has a higher error detection priority than the format error.
No Command Text
Command
Node number Sub-address
STX
Response
Node number Sub-address End code
STX
End code 14 (format error) is returned in the response when there is no
command text.
Decimal point
Decimal point is removed and the result is converted
to hexadecimal.
Example conversion: 105.0 → 1050 → H'0000041A
BCC
0 A ETX
0 A 1 6 ETX
SID BCC
0 0 0 ETX
0 0 1 4 ETX
4
BCC
BCC