Huawei AR500 Series Hardware Description page 667

Huawei
AR500&AR510&AR531&AR550&1500&AR2500
Industrial Switch Routers
Hardware Description
Pin
3
4
5
6
7
8
DI/DO Processing
l
Issue 10 (2019-03-06)
Definition
DIDO1
DIDO2
DIDO3
DIDO4
DIDO5
GND
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
Copyright © Huawei Technologies Co., Ltd.
Attribute Description
IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on
IN/OUT, LVTTL Digital input/output
pin, providing
digital input by
default after power-
on
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
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
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
Ground Ground line
Table 6-24.
6 Cables
656