RS-232 Protocol
Chapter Six: RS-232 Communications Option
88
Responses for Rejected Commands
Response
Cause
?parameter data
Invalid data field
>parameter data
unrecognized parameter
or identifier
id
=parameter data
Command is inappropriate at this time
Table 20: Responses for Rejected Commands
The response to an accepted command will be identical to the command itself.
Response to a Request
The response to a request will follow the format listed below:
status parameter id data <CR>
where:
status
‘@’ indicates valid data
‘>’ parameter value is unrecognized
‘?’ data field value invalid
‘=’ request is inappropriate
parameter
is identical to the parameter field of the request received
id
is identical to the id field of the request received
data
contains the data requested
Example: Response to A Report Reading Request
The response to a request to report the pressure reading (02) will have the following format, if
accepted:
@020 status reading <CR>
where:
status
‘space’ where space represents one blank space if reading is valid
‘!’ if the 670 instrument is calibrating
‘"’ if the pressure reading is underranged
‘#’ if the pressure reading is overranged
Note
The parameter and id fields in the response will be identical to the
parameter and id fields contained in the request received by the 670
instrument. The data field in the response will contain the current value
of the parameter or mode specified by the parameter field.
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