Measurement Computing Analyzer488 - Manual (Page 175)

Section 4 Serial Controller
4.81
STEP
The STEP command causes the Analyzer488 to perform one source or acceptor
handshake when STEP handshake is selected. The STEP command is used to
complete a handshake and allow new data to be placed on the bus (in Talk State), or
received from the bus (in Listen State).
The query option, STEP?, returns 1 (True) if there is data on the bus to be read
or if a bus device is waiting for data. STEP? returns 0 (False) otherwise.
TYPE Low Level Controller command
SYNTAX STEP [?]
RESPONSE None
MODE Low Level Controller
BUS STATES Dependent on data on the bus
QUERY Returns 1 (True) if there is data on the bus to be read or if a bus
RESPONSE device is waiting for data. Returns 0 (False) otherwise.
EXAMPLES PRINT#1,"CONTROLLER OFF"
PRINT#1,"ASSERT IFC ATN REN"
PRINT#1,"UNASSERT IFC"
PRINT#1,"TALK"
PRINT#1,"HANDSHAKE STEP"
PRINT#1,"WRITE &H54"
Send TAG20 command
PRINT#1,"UNASSERT ATN"
PRINT#1,"LISTEN"
PRINT#1,"VIEW BUS"
View data from device 20
INPUT#1,A$:PRINT A$ one byte at a time
PRINT#1,"STEP"
PRINT#1,"VIEW BUS"
INPUT#1,A$:PRINT A$
PRINT#1,"STEP"
PRINT#1,"VIEW BUS"