Pin Definition Attribute Description
3 DIDO1 IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on
4 DIDO2 IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on
5 DIDO3 IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on, pulled up to 3.3
V with a 4.7 kohm
pull-up resistor
6 DIDO4 IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on, pulled up to 3.3
V with a 4.7 kohm
pull-up resistor
7 DIDO5 IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on, pulled up to 3.3
V with a 4.7 kohm
pull-up resistor
8 GND Ground Ground line
DI/DO Processing
l Use of the DI lines:
– Connection of any of DI lines 0, 1, and 2: Connect one terminal on a switch to a DI
line and to the 3.3 V power supply line through a 4.7 kohm pull-up resistor.
Connect the other terminal on the switch to the GND line.
– Connection of any of DI lines 3, 4, and 5: Connect one terminal on a switch to a DI
line, and connect the other terminal on the switch to the GND line.
Determine the levels on the DI lines according to Table 6-24.
Huawei
AR500&AR510&AR531&AR550&1500&AR2500
Industrial Switch Routers
Hardware Description
6 Cables
Issue 10 (2019-03-06) Copyright © Huawei Technologies Co., Ltd. 656
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