Specifications

Chapter 12 143
Connecting the Instrument to a Handler with the Handler Interface
Input/Output Signal Pin Layout
12. Connecting the
Instrument with a Handler
(Using the Handler Interface)
NOTE A signal prefixed with a slash (/) is a negative logic signal (i.e., changes to Low when
activated).
12, 13 EXT_TRIG
Input
An external trigger signal. Available when the
trigger mode is set to Ext (external trigger source).
The instrument is triggered when the pulse reaches
a rising/falling
*1
edge.
14, 15 EXT_DCV External DC voltage. Supplies voltage necessary
for driving input signals. The pin accepts input
voltage within the range between +9 V and +15 V.
16, 17, 18 +5V
Output
Internal DC voltage.
19 /BIN11 These signals indicate the result of sorting. For
more information, refer to the description of pins 1
through 11.
20 /BIN12
21 /BIN13
22 /READY_FOR_TRIG The /READY_FOR_TRIG signal changes to the
Low level when the instrument can be triggered.
When the handler receives this signal, it can input
an external trigger signal to the instrument.
23 /RDC_OUT_OF_RANGE The /RDC_OUT_OF_RANGE signal changes to
the Low level when the result of R
dc
measurement
does not fall within the specified limit range.
24 /OVLD The /OVLD signal changes to the Low level when
analog measurement cannot be performed
(overload).
25 /KEY_LOCK
Input
Key lock signal. Changing this signal to the Low
level locks the 4287A's front panel (keys and rotary
knobs), keyboard, and mouse.
26 (Reserved). ——— Currently not in use. Leave this pin unconnected.
27, 28 EXT_DCV
Input
External DC voltage. For more information, refer to
the description of pins 14 and 15.
29 /ALARM
Output
The /ALARM signal changes to the Low level
when an alarm condition is detected; for example,
when the instrument does not satisfy a self-test
item, or a particular circuit malfunctions.
30 /INDEX The /INDEX signal changes to the Low level when
analog measurement is complete. When the handler
receives the signal, it assumes that it is ready to
connect the next DUT. However, no measurement
data is available until the /EOM signal is received.
31 /EOM The /EOM signal changes to the Low level when
the instrument is ready to return measurement data
and sort results after performing one complete
cycle of measurement.
32, 33, 34, 35,
36
COM
———
Common for output signal pull-up voltage.
*1.The :TRIG:SLOP command on page 309 sets the polarity (rising or falling).
Table 12-1 Description of the handler Interface Input/Output Signals
Pin number Signal name Input/
output
Description