Table 6-24
Levels on DI lines
Switch
DI Lines 0, 1, 2
DI Lines 3, 4, 5
Open
High level
High level
Closed
Low power
Low power
Switch
Switch
3.3V
DI
DI/DO interface
DI
3.3V
DIDO0，DIDO1，DIDO2
DIDO3，DIDO4，DIDO5
GND
l
Use of the DO lines:
–
Connection of any of DO lines 0, 1, and 2: Connect the positive pole of an LED to
the 3.3 V power supply line a current-limiting resistor, and connect the negative
pole of the LED to a DO line.
–
Connection of any of DO lines 3, 4, and 5: Connect the positive pole of an LED to a
DO line and connect the negative pole to the GND line.
Determine the levels on the DO lines according to
.
Table 6-25
Levels on DO lines
LED
DO Lines 0, 1, 2
DO Lines 3, 4, 5
On
Low power
High level
Off
High level
Low power
Huawei
AR500&AR510&AR531&AR550&1500&AR2500
Industrial Switch Routers
Hardware Description
6 Cables
Issue 10 (2019-03-06)
Copyright © Huawei Technologies Co., Ltd.
657
