Measurement Computing Analyzer488 - Manual (Page 131)

Section 4 Serial Controller
4.37
HANDSHAKING STEP allows the user to participate in bus events
one event at a time. The Analyzer488 performs one bus handshake
upon receipt of the STEP command. The STEP command must be
used to complete each bus event when using the ASSERT and VIEW
commands. However, when using the READ or WRITE commands,
the STEP command is not required. STEP may be used when
recording, or participating in bus events.
MODE High or Low Level Controller
BUS STATES Dependent on the current state of the bus.
QUERY Present handshake speed.
RESPONSE
EXAMPLES PRINT #1,"CONTROLLER OFF" Select low level control
PRINT #1,"HANDSHAKE NONE" Do not participate in bus
events
PRINT #1,"RECORD ON" Record bus events without
appearing to be an active
listener.
PRINT #1,"CONTROLLER OFF" Select low level control
PRINT #1,"HANDSHAKE STEP" Participate in bus events in
single step speed
PRINT #1,"ASSERT REN ATN" Assert ATN and REN to
cause devices to interpret data
as bus commands
PRINT #1,"WRITE &H3F" Send UNL command
PRINT #1,"WRITE &H50" Send TAG16 command
PRINT #1,"VIEW BUS" Read current bus status
INPUT #1,A$ : PRINT A$ Print response
PRINT #1,"STEP" Perform 1 handshake
PRINT #1,"VIEW BUS" Read current bus status
INPUT #1,A$ : PRINT A$ Print response