Sigma C4 manual Qccrlf

7.5.4 QC Query Last Command

This command returns the last non-null command string sent to the controller. The returned string is the string that was delivered to the controller after the internal parser did any “fixing”. It does not have to be a valid command. The string is ASCII text and is terminated with <CR><LF>. Null strings are discarded by the parser.

Example:
Previous command sent:	QC returns:
Ra, -55 2,11<CR><LF>	RA -55 2 11<CR><LF>
The syntax for the command is:
QC<CR><LF>

7.5.5 ES Enable SRQ (Status Request Mode)

For the IEEE-488 interface, SRQ is sent with the binary status. The status is not cleared until read with an RS command.

This command enables the SRQ function. Format of the command is:

ES<CR><LF>

SRQ is sent on all error changes or if Status Byte bit 3 (interval complete) or bit 4 (setpoint reached) is set. For the EIA-232 interface, SRQ is sent as the ASCII string:

SQ "binary status byte" <CR> <LF>

7.5.6 DS Disable the SRQ

This command disables the SRQ function (default is DS - disabled). Format of the command is:

DS<CR><LF>

66 C4 Manual Rev 7.5.2