Sabio 2010D, Operation Manual

Page: 120 / 182

Serial Communications Page 7-18
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Response Structure
Any time a command is sent with an address recognized by an
instrument on the network, the addressed instrument should
return a response. The exact response will depend upon whether
the command is to return data or not and if errors are detected
in the command. Following, the three possible responses are
summarized:
Successful Response, no data:
<ACK>
Where: <ACK> = Acknowledge Character (06 hex)
Successful Response, with data:
<CR> {data1}, [{data2},]
  
[{dataN},] [CHK] <CR>
Where:
,
= Comma (field separator)
{dataX} = Data Field
[CHK] = Optional Data Verification Field
<CR> = Carriage Return Character (0D hex)
Error Response
<NAK>[ER][<CR>]
Where: <NAK> = Negative Acknowledge Character (15 hex)
[ER] = Optional two digit error code
[<CR>] = Optional carriage return character
If no errors are detected and no data is to be returned, an <ACK>
(06 hex) character will be returned to indicate that the command
was successfully executed. If data is needed in the response, a
<CR> (0D hex) character will be returned followed by one or more
parameters of data, separated by commas. A final comma separates
the last data item from the carriage return (or optional data
verification field) at the end of the response. As with command
data fields, all response data characters must be printable ASCII
characters.
Should there be a problem with the command, a <NAK> (15 hex)
character will be returned, optionally followed by an error code.
A listing of possible error codes is provided on page 7-20.