Parker 6513, Техническое руководство

Страница: 32 / 54

ASCII
25
RS485/RS232 Communications Interface
Control Character Definitions when Reading Information
(ENQ) Indicates the end of the message, and that it is an enquiry
(ACK) Sequential Polling: when transmitted after a valid response, this fetches
data from the next parameter in the parameter list
(NAK) Continuous Polling: when transmitted after a valid response, this fetches
data from the previously requested parameter
(EOT) The information received contained an error
Control Character Definitions when Writing Information
(ACK) Positive Acknowledgement: the message was correctly received and the
parameter updated
(NAK) Negative Acknowledgement: the message received by the drive
contained an error and the parameter was not updated
Last Error Code (EE)
The EI-BISYNCH Prime Set contains the EE mnemonic. The following values are returned if
an enquiry (reading information from the drive) is performed on this Read/Write parameter.
Writing any value to this parameter will set the value to >00C0. Clearing the last error value
may be useful in seeing a repetitive error re-occurring.
Value Description
>00C0 No error
>01C7 Invalid Mnemonic
>02C2 Checksum (BCC) error
>04C8 Attempt to read from a write-only parameter
>05C8 Attempt to write to a read-only parameter
>07C8 Invalid Data (Encoding error)
>08C8 Data out of range