2.15.2 External interface function
ET54 series is equipped with RS232 and USB communication interface, users can choose
any one interface to complete the communication with the computer.
USB interface:
After connecting the load and PC through USB public connection line, the PC can
communicate with the load by serial port software or PC, configure and communicate with RS232
interface mode.
RS232 interface:
Communication interface specification：RS-232 interface supports SCPI
protocol, and can be programmed using SCPI command. When using RS232 interface
for data communication, it is necessary to configure the communication
parameters on PC and load side. For example, the communication parameters of
load can be configurated in the communication settings interface, as shown in
Figure 2.5.2 communication settings interface.
Indicate interface specification：The output of the test result and the
indication of the running state are valid. The low level output is valid. The
default output is high level 3.3V. For external trigger input pins, the falling
edge is effective, and the two falling edge interval should be greater than
10ms.
21
Interface
Pin
Pin definition
Explain
RS232
2
RXD
RS232 interface
3
TXD
RS232 interface
5/6
GND
Indicator
interface
4
PASS
Test result level output
7
NTRI
External trigger input
8
FAIL
Test result level output
9
RUN
Operation state level output
