Huawei ECC500 User Manual page 34

ECC500
User Manual
Silk Screen
Table 3-11
Table 3-11 Description of ports on the front panel of the Independent Deployment AI/DI Unit
Silk Screen
COM_IN
COM_OUT
AI/DI_1 to
AI/DI_8
The Independent Deployment AI/DI Unit is configured with a 4-bit DIP switch. Set toggle
switches 1 to 3 to configure the address of the Independent Deployment AI/DI Unit, and set
toggle switch 4 to enable or disable the resistance for the RS485 port.
mapping between the Independent Deployment AI/DI Unit address and the DIP switch
settings.
Table 3-12 Mapping between the Independent Deployment AI/DI Unit address and the DIP
switch settings
Address
1
2
Issue 05 (2020-03-16)
Color
describes ports on the front panel of the Independent Deployment AI/DI Unit.
Port Description
Cascading ports. COM_IN connects to the RS485 expansion card, and
COM_OUT connects another Independent Deployment AI/DI Unit.
Pin definitions of the ports are the same as those of the COM4 port on
the communication card.
Provide 12 V DC outputs for sensors and are compatible with 4 mA to
20 mA current signals, signals from current-based smoke sensors and
water sensors, dry contact signals, and NTC signals.
Pin definition:
 3: 12 V DC, 54 mA
 6: D-
 7: D+
 8: GND
SW1
OFF
ON
If the signal quality is poor due to signal reflection caused by long communications cables (longer than
50 m), set toggle switch 4 to ON for the furthest independent deployment AI_DI unit. After the DIP
switch settings are modified, power off and restart the independent deployment AI_DI unit for the new
settings to take effect.
Copyright © Huawei Technologies Co., Ltd.
Meaning Status
Steady on
SW2
ON
OFF
3 Configurations and Port
Description
A board alarm is
generated.
Table 3-12 describes the
SW3
ON
ON
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