ET1301/1302/1303/1304 Programmable DC Electronic Load User Manual
Hangzhou Zhongchuang Electronics Co., Ltd.
16
COM port
Interface
pin
Pin efinitions
RS232
DB9 female
2
TXD
3
RXD
5
GND
USB-Device
USB-B female
2.16.2 Expansion port
Expansion port output
S1+
Measure the positive input terminal at the far end
S1-
Measure the negative input terminal at the far end
R1
The list test is in progress, low effectiveness
P1
The list test result is qualified, low effectiveness
F1
The list test result is unqualified, low effectiveness
G
GND
Expansion port input
N1
External trigger input
The extension port output is OC gate output. The user needs to connect the pull-up resistor and pull-up
level. The range of pull-up level is 0-50V and the sink current is 0-100mA. Exceeding the above
electrical range will damage the device interface.
The extension port input is the external trigger input terminal, and the falling edge is effective. The
interval between two falling edges should be greater than 100mS.
GND
TRIG
N1
2.16.3
Current monitoring terminal
This terminal is the current monitoring terminal, and the output range is 0-11V.
