Port Pin Function Description
DO NO1 Normally open contact
for digital output signal
1
● The DO port has two types of dry
contacts. The DO contact capacity
is 12 V DC@1 A. The NO and COM
contacts are normally open.
● NO1/COM1 is used to control the
heat pump, and NO2/COM2 is
reserved.
COM1 Common contact for
digital output signal 1
NO2 Normally open contact
for digital output signal
2
COM2 Common contact for
digital output signal 2
Procedure
Step 1 Connect the RS485 communications cable to the 14-pin connector.
Figure 5-10 Connecting RS485 communications cables
(1) Inverter
Step 2 Connect the DO signal cable or 12 V output cable to the 14-pin connector.
The EMMA can be connected to the SG Ready heat pump through the DO signal
cable or 12 V output cable. The EMMA provides two control modes based on the
SG Ready heat pump port.
● Mode 1: Use a 12 V@100 mA power supply to drive the external relay. Choose
the proper contact capability of the external relay according to the SG Ready
heat pump port.
EMMA-(A01, A02)
User Manual 5 Electrical Connections
Issue 05 (2024-01-19) Copyright © Huawei Digital Power Technologies Co., Ltd. 36
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