Yokogawa JUXTA VJ Series Limit Alarms - Manual (Page 48)

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<Toc> <Ind> <5. MODBUS Communication >
IM 77J01J11-01E 3rd Edition : Oct. 15, 2007-00
5.2.2 Response Error Code[Response]
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Message Format in the Event of Error
If there are any inconsistencies other than communication errors in a message, a VJ Series
signal conditioner does nothing, but returns the following message.
Number of bytes in RTU mode
Number of bytes in ASCII mode 2
2
Address
Number
(ADDRESS)
Element Function Code
(*1)
Error Code Error Check [CR] [LF]
2
None
2
1
2
1
2
1
050220E.EPS
*1: The function code contains a function code (hexadecimal number) + number 80 (hexadecimal number).
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Response Error Codes
Table 5-3 List of Error Codes
01
Error Code Meaning Description
02 D-register number error
Function code error
03 D-register count error
D-register number out of the range has
been specified.
No function code exists.
Number of D registers has been specified,
being out of the range.
050221E.EPS
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Even when a message is sent, no response returns if:
• Retransmission error (overrun, framing, parity, LRC, or CRC-16 error) was detected.
• Address in an instructed message is incorrect.
• Interval between data composing a message was 2 seconds or more.
• CRC-16 or LRC values are incorrect.
Note: As a countermeasure, provide a timeout process in the communication functions of a higher-level device or in the
communication program.