Huawei ECC500 User Manual page 29

ECC500
User Manual
Table 3-7 Description of ports on the front panel of the RS485 communication card
Silk Screen
COM1, COM2,
and COM3
COM4/12V and
COM5/12V

COM4/12V and COM5/12V ports: Pins 3 and 8 of these two ports provide 12 V DC power.
Therefore, before connecting equipment to the ports, check the equipment pin description
to ensure that pins of the equipment match those on the ports, preventing damage to ports
or the equipment.

If an RS232 port transfers to an RS485 port and connects to an RS485 communications
card, one COM port connects to only one RS232 device. The recommended COM port is
COM1, COM2, or COM3.
The internal circuit design of the RS485 communication card allows its COM port to support
two-wire RS485 and four-wire RS422, eliminating the need to cascade cables, as shown in
Figure
Issue 04 (2019-12-20)
Port Description
Connect to intelligent equipment, such as the PDU8000, UPS, and
cooling equipment.

1: A
 2: B

4: A
 5: B
Provide DC outputs of 12 V (actual range: 12.8-15 V), 400 mA to
equipment such as Independent Deployment AI/DI Unit, intelligent
ambient temperature and humidity sensors, and electronic door locks.
 1: A

2: B
 3: 12 V DC power

4: A
 5: B

8: GND
3-5.
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3 Configurations and Port
22