4-2-4. HP-IB DEFINITION
The HP-IB definition settings (addressable/talk only and HP-IB address number) are stored in
nonvolatile memory.
Addressable Mode:
The HP-IB address of the 4278A can be set from 0 to 30. The address set at the factory is
17. The procedure for setting the HP-IB address is as follows.
1. Press the MENU and the PREV keys.
2. Press the `HP-113 DEFINE' and the ‘ADRSABLE' softkeys.
3. Press the 'HP-IB ADRS=' softkey. "ADDRESS= (current address)" will be
displayed.
4. Enter the desired address using the front-panel numeric keys, and then press the
ENTER key.
NOTE
To see the current set HP-IB address, press the '11P-IB ADRS=' softkey and it will
be displayed on the input line.
Talk Only Mode:
The 4278A is set to the HP-IB talker mode, and outputs the measurement data to the bus.
When connected with a Listen-Only printer, an automatic measurement data recording sys-
tem can be built without using an 1-1P-IB controller. The output data is restricted to ASCII
characters. The output data format is shown below. Refer to paragraph 4-2-7 for details.
DATA A
SN.NNNNNESNN
DATA 8 BIN NO.
SN.NNNNNESNILI HO -A NNNNNN
NOTE
CRLFAE01/---1
(N: 0 to 9, S: + or -)
BIN number data is valid only when the comparator function is set to on. When
the comparator function is set to off, the bin data is always zero.
In the talk-only mode, the 4278A doesn't wait for the handshake to be completed
before starting next measurement. If the printer is slow and doesn't print properly,
use the trigger delay function to reduce the 4278A's measurement speed.
4-5
To Next Page
