A-16 Serial Communications
DC590+ Series DC Digital Drive
Continuation Messages
There are two types of continuation messages sent by the Supervisor:
NEXT (send next item from a list)
Only valid if sent following a multi-parameter poll.
(ACK)
REPEAT (repeat last response)
Only valid if sent following any type of poll. It requests a repetition of the previous response.
(NAK)
Serial Transmission Responses
SELECTION MESSAGE RESPONSE (one character)
Sent after the correct reception of a Selection message.
(ACK)
FAULT DETECTION RESPONSE (one character)
Sent in the case of detecting a fault.
(NAK) or (EOT)
POLLING MESSAGE RESPONSE (more than one character)
(STX) (PNO) (D1) (D2) (D3) (ETX) (BCC)
MULTI-POLLING MESSAGE RESPONSE (more than one character)
The response can consist of a group of messages (blocks). The (ETX) character is only sent at the end of the last block (as for Polling Message
Response above).
For other blocks, the (ETX) is replaced by an (ETB) to indicate an end of a block rather than the end of the response.
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