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Remote Operation via HP-IB
Changing the HP-IB Address
Every device on the HP-IB must have a unique address. The HP 3325B address can be set at
any address between 0 and 31, inclusive, and is stored in internal nonvolatile memory. When
selecting an address, remember that the controller also has an address (usually 21).
To change the HP-IB address:
1.
Press the blue [Shift] key followed by the [Local] key in the HP-IB Status
block to display the HP-IB address.
2.
Enter the address with the data entry keys or change it with the arrow keys.
3.
Press any units key to enter the new address.
Notes
An address entry of 31 sets the HP 3325B to //sten only and the message
"Addr. = LO" appears in the display.
If you enter an address greater than 31, the message "Error 100" appears in the
display (entry parameter out of range).
The HP-IB address is reset to 17 after a memory clear operation
(hold down the Preset key and cycle power).
Bus Commands
The HP-IB interface system operates in one of two modes, controlled by the ATN bus
management line: command mode (ATN true) or data mode (ATN false). (If an HP controller
IS used, the bus management lines are configured automatically and all necessary command
strings are issued.)
Bus commands are issued while the HP-IB is in the command mode. These commands may
instruct the instrument's HP-IB interface to control the instrument (like Clear or Trigger)
put are more often used for bus management (Remote, Local, Polls, Service Request, Abort
mterface activity, or Pass Control). Bus commands are issued through the use of one of the
SS*
lines or through the eight-bit data bus. The bus commands and the
rlF oo25B responses to them are described in the following:
Abort
The ahort command (interface clear - IFC true) halts all HP-IB activity. The system
controller assumes unconditional control of the bus. The HP 3325B responds by
becoming unaddressed.
Clear
The c^ar command causes all devices addressed to listen to reconfigure themselves to a
gredefmed devic^dependent condition. The HP 3325B responds to the clear command (both
V tv
selective device clear, SDC) by clearing the interface command
bufrer of any pending commands, clearing the error register, and resetting the instrument
to the Preset state.
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