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HP289
input is usually connected to the "Data Buffer Full" output from the
printer.
If the printer buffer is large enough to handle the message output from
the instrument, then this input need not be used and should be left
unconnected.
Computer
The instrument receives and transmits messages in ASCII with all
command strings to the instrument terminated by a carriage return.
While replies from the instrument are terminated with a carriage return
and a line feed.
Xon/Xoff protocol is also supported and the instrument will
automatically determine if the message sent by the host computer is
preceded by an Xoff character. If it does recognize an Xoff as the first
character of a command string, the instrument will automatically switch
to the Xoff/Xon protocol beginning and ending all messages with Xoff
and Xon characters respectively. Xoff/Xon protocol is only available
when the RS232 interface is selected.
During configuration, the instrument can be configured to operate in a
full duplex or half duplex transmission mode. In full duplex mode, all
commands sent to the instrument are echoed back to the host computer.
In half duplex, the commands are not echoed.