HARMONIC HA-600-4 Differential expansion module

HARMONIC HA-600-4 Differential expansion module

Command Replies The reply from the module depends on the given command. In general the command can be grouped in two categories: Write commands and Read commands. For write commands there are two specific replies that indicate that the command has been correctly elaborated or not. Those replies are hereafter presented:  AcKnowledge (“#AK”) indicates that the command is valid and it was correctly elaborated by the device: #AK\r\n  “#AK” is the AcKnowledged response to a valid command;  “\r\n” is the termination sequence of the reply.

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Not AcKnowledge (“#NAK”)

 indicates that the command is either not valid or that it was not accepted by the device; the “NAK” reply is followed by an “error code” field, which can be used to determine the cause of the error (see the List of the Error Codes appendix for a detailed list of all possible error codes): #NAK:01\r\n  “#NAK” is the Not AcKnowledged response to an invalid command;  “:” is the parameter’s separation character;  “01” is the error code,  “\r\n” is the termination sequence of the reply. For read commands, the replies are generally formed by an echo string, followed by the corresponding read value.

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