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4-1-3 Error Codes
End code
H'01
Function code error
H'02
Variable address error
H'03
Variable data error
H'04
Operation error
No Response
In the following cases, the received command will not be processed and a response will not be
returned.
Consequently, a timeout error will occur at the host device.
• The slave address in the received command does not match the communications unit number.
• A parity error, framing error, or overrun error occurred due to a problem such as a transfer error.
• A CRC-16 code error occurred in the received command frame.
• There was a time interval of more than 3.5 character times between data packets that make up
the command frame.
Furthermore, the specified function's processing will be performed but no response will be returned
for broadcast functions (slave address = H'00).
E5@D Digital Temperature Controllers Communications Manual (H225)
Name
An unsupported function code was received.
The specified variable area address is out-of-range.
The amount of data does not match the number of elements.
The byte count is not 2 times the number of elements.
The response length exceeds the size of the communications buffer.
The command code or related information in the operation command is
wrong or the write data is not in the setting range.
The write data contents are not allowed in the present operation mode.
• The Communications Writing parameter is set to "OFF" (disabled).
• Attempted to write to a parameter in setup area 1 from setup area 0.
• Attempted to write to a protect parameter from other than the protect
level.
• AT execution is in progress.
• The command cannot be processed.
• Automatic filter adjustment is in progress.
4 Modbus Communications Procedure
Description
4
4 - 5
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