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5.2 Handler Interface
Many instruments are used in industrial control. In order to better use the device with opto-coupled control signals,
the Handler interface is added to facilitate the use of the instrument on the production line.
Because the space is limited, the interface connector used is the same as the GPIB interface, and the interface
terminals used are the same.
Pin
Name
Function
Pin
Name
Function
1
PASS
Test is OK
13
START
External start signal
2
FAIL
Test result is bad
14
EOC
Test end indicator signal
3
HI0
Test result is too large
15
Front
Front panel indicator signal
4
IN0
Test result is just right
16
Rear
Rear panel indicator signal
5
LO0
Test result is too small
17
EXT_VCC
External power supply
6
PASS0
Test is OK
18
EXT_VCC
External power supply
7
FAIL0
Test failed
19
EXT_GND
External power ground
8
HI1
Test result is too large
20
EXT_GND
External power ground
9
IN1
Test result is just right
21
VDD
Output power
10
LO1
Test result is too small
22
VDD
Output power
11
PASS1
Test is OK
23
EGND
Output power ground
12
FAIL1
Test failed
24
EGND
Output power ground
1.
When the Limit function is ON, the trigger of the Handler interface makes sense.
2.
IN indicates that the test result is between the upper and lower limits of the setting; LO indicates that the test
result is less than the lower limit; HI indicates that the test result is greater than upper limit.
3.
PASS0, FAIL0, IN0, LO0, and HI0 indicate the test results of the front panel. PASS1, FAIL1, IN1, LO1, and
HI1 indicate the test results of the rear panel. When the front panel is selected, the data on the rear panel has
no meaning. When the rear panel is selected, the data on the front panel has no meaning.
4.
Front indicates that the test is currently on the front panel
5.
Rear indicates that the test is currently performed on the rear panel.
6.
EXT_VCC and EXT_GND are the high and low terminals of the external power supply.
7.
VDD and EGND are the internal supply voltage, about 5V, but the drive capability is not strong. The
relationship between the output current I
O
and the output voltage V
O
is approximately:
