28
22
/V-LO
0
：
V-LO
23
/R-HI
0
：
R-HI
24
/R-NG
0
：
R-NG
25
/R-LO
0
：
R-LO
Input end
Tabel
7
‐
2 Input pin definition
Pin
Name
Explain
18
Trigger
input
Trigger input, built-in 0.25W, 2K, current limiting resistor. The
rising edge is effective.
Power terminal
Table 7
‐
3 Power end pin definition
Pin
Name
Explain
27-30
GND
Power Supply GND
33-34
External VCC
External power input terminal
35-36
Internal VCC
Internal VCC power supply positive end
（
5V
，
1A
）
1,3
External triggering
6,7
PASS
8
，
9
FAIL
7.2 Connection mode
Use external power supply (recommended)
Please connect the external power to the following pin simultaneously.
VCC
：
33-34 foot
GND
：
27-30 foot
Internal power supply 35-36
：
floating.
Use internal power supply
Note! In the case of unknown or uncertain power, internal power supply should not be
used, otherwise the instrument will not work properly.
In known low-power applications, you can work with an internal power supply,But it may
make the instrument's anti-interference ability worse.
