Modbus Gateway(Pro) Technical Service Manual
5
connection wire, to realize communication between Modbus Gateway(Pro) and air conditioner.
RS485-1 communication interface:It is connected to BMS through two-core connection wire,
to realize communication between Modbus Gateway(Pro) and BMS.
RS485-2 communication interface: This device doesn’t use this communication interface
currently.
Interface of USB or SD card:
This device doesn
’
t use this interface currently.
Ethernet interface:
This device doesn
’
t use this interface currently.
2.3 Introduction of Photoelectric Isolation Converter
2.3.1 Functions
Photoelectric isolation converter is used for converting RS232 signal and RS485 signal. It
shall be used only when user’s BMS system adopts RS232 communication way.
2.3.2 Appearance
Note: Please refer to the actual product; the picture is only for reference.
2.3.3 Instructions of Interfaces and Indicators
Power
RX
TX
C53
R+ R-
RS232
V+ V- E
DB9 female, connects
with computer serial port
Power wiring terminal
Power indicator
Indicator for receiving data
Indicator for sending data
RS485 wiring terminal
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