TTI TSX Series Instruction Manual page 21

ARC Remote Command Formats
Serial input to the instrument is buffered in a 256 byte input queue which is filled, under interrupt,
in a manner transparent to all other instrument operations. The instrument will send XOFF when
approximately 200 characters are in the queue. XON will be sent when approximately 100 free
spaces become available in the queue after XOFF was sent. This queue contains raw (un-
parsed) data which is taken, by the parser, as required. Commands (and queries) are executed in
order and the parser will not start a new command until any previous command or query is
complete. There is no output queue which means that the response formatter will wait, indefinitely
if necessary, until the instrument is addressed to talk and the complete response message has
been sent, before the parser is allowed to start the next command in the input queue.
Commands are sent as
or more
<PROGRAM MESSAGE UNIT>
elements.
<PROGRAM MESSAGES>
consist of the new line character (0AH).
A
<PROGRAM MESSAGE UNIT SEPARATOR>
A
<PROGRAM MESSAGE UNIT>
Responses from the instrument to the controller are sent as
<RESPONSE MESSAGE>
MESSAGE TERMINATOR>
20
Status Model
<PROGRAM MESSAGES>
elements separated by
are separated by
<PROGRAM MESSAGE TERMINATOR>
is the semi-colon character ";" (3BH).
is any of the commands in the REMOTE COMMANDS section.
consists of one
<RESPONSE MESSAGE UNIT>
.
by the controller, each message consists of zero
<PROGRAM MESSAGE UNIT SEPARATOR>
<RESPONSE MESSAGES>
followed by a
elements which
. A
<RESPONSE