HP 7470A Interfacing And Programming Manual page 209

Set Handshake Mode 1 Page10-28
. H [(<DEC>) ; (<ASC>) ; (<ASC>( ; . . . <ASC>)) ]:
Purpose: Establishes parameters for handshake mode 1, used when
response to enquiry character requires ESC . M parameters.
Parameters: <DEC> — Block size or Xoff threshold level.
<ASC> — Enquiry character or not used.
<ASC> . . .<ASC> — Acknowledgment string of 1 to 10
characters or Xon trigger characters.
Set Handshake Mode 2 Page10-29
. I [(<DEC>) ; (<ASC>) ; (<ASC>( ; . . . <ASC>)) ]:
Purpose: Establishes parameters for handshake mode 2, used when
response to enquiry character does not require ESC . M
parameters.
Parameters: <DEC> —Block size or Xoff threshold level.
<ASC> — Enquiry character or omitted.
<ASC> . . .<ASC> — Acknowledgment string of 1 to 10
characters or Xon trigger characters.
Abort Device Control Page10-31
. J
Purpose: Aborts any partially decoded or executed device control
instructions including outputs.
Abort Graphic Instruction Page10-32
. K
Purpose: Aborts any partially decoded HP-GL instruction and dis­
cards instructions in buffer.
Output Buffer Size Page10-32
. L
Purpose: Outputs the buffer size.
Response: 255. Not output until the buffer is empty.
INSTRUCTION SYNTAX B-13