Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 301)

15A. Driver488/DRV Commands III. COMMAND REFERENCES - 15. Command References
III-286 Personal488 User’s Manual, Rev. 3.0
CHECK LISTENER
SYNTAX CHECK LISTENER pri-addr[sec-addr]
pri-addr is a primary device address in the range 0 to 30 .
Sec-addr is an optional two-digit secondary device address in the range 00 to 31 .
RESPONSE 1 if listener found
0 if listener not found
MODE CA
BUS STATES ATN
•MTA, UNL, LAG, (check for NDAC asserted)
SEE ALSO FIND LISTENER, BUS ADDRESS
EXAMPLE PRINT#1”CHECKLISTENER 1501”
INPUT#2,N
IF N=1 THEN PRINT “LISTENER FOUND”
IF N=0 THEN PRINT “LISTENER NOT FOUND”
The CHECK LISTENER command checks for the existence of a device on the IEEE 488 bus at the
specified address.
CLEAR
SYNTAX CLEAR [addr[,addr…]]
addr is a device address (primary with optional secondary) or an external
device name.
RESPONSE None
MODE CA
BUS STATES ATN
•DCL (all devices)
ATN
•UNL, MTA, LAG, SDC (selected devices)
SEE ALSO RESET
EXAMPLES PRINT#1,CLEAR” Issue a Device Clear to all devices.
PRINT#1,”CLEAR12,18” Issue a Selected Device Clear to devices 12 and 18.
PRINT#1,”CLEAR DMM” Issue a Selected Device Clear to the device DMM.
The CLEAR command causes the Device Clear ( DCL ) bus command to be issued by Driver488. If the
optional addresses are included, the Selected Device Clear ( SDC ) command is issued to all specified
devices. IEEE 488 bus devices that receive a Device Clear or Selected Device Clear command
normally reset to their power-on state.
CLOCK FREQUENCY
SYNTAX [CLOCK]FREQUENCY frequency
frequency is the actual clock rate in megahertz rounded up to the nearest whole
number of megahertz.
RESPONSE None
MODE Any
BUS STATES None
SEE ALSO RESET
EXAMPLE PRINT#1, “CLOCK FREQUENCY 8”
The CLOCK FREQUENCY command specifies the IEEE 488 adapter internal clock frequency. The clock
frequency depends upon the design and jumper settings of the interface board. The specified clock
frequency must be the actual clock rate in megahertz rounded up to the nearest whole number of
megahertz. For example, the MP488 and MP488CT boards use a fixed clock frequency of 8 MHz.