Tonghui TH1953, Operation Manual

Page: 37 / 73

37
6.2 Handler Interface
Many instruments are used in industrial control. In order to better use with 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 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 FALL Test result is wrong 14 EOC Test end 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 FALL0 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 Connect the ground
12 FALL1 Test failed 24 EGND Connect the ground
1. When the Limit function is ON, the trigger of the Handler interface works.
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, FALL0, IN0, LO0, and HI0 indicate the test results of the front panel. PASS1, FALL1, IN1, LO1,
and HI1 indicate the test results of the rear panel. When the front panel is selected, the logo on the rear panel
has no meaning. When the rear panel is selected, the label 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 is 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: