Modbus Gateway(Pro) Technical Service Manual
2
system. One CAN2 network can be connected to maximum 16 systems and 255 IDUs.
System: One system consists of one set of outdoor unit (one set of outdoor unit is a module
group consisting of 1~4 modules, that is 1~4 outdoor units) and it’s connected indoor units.
Connectable unit quantity of Modbus Gateway(Pro): one Modbus Gateway(Pro) can be
connected with 16 outdoor units and 255 indoor units in maximum.
2.Component Introduction
2.1 Component List
2.1.1 Safety Requirements for Engineering Installation
Gateway
component
ME30-24/E5(M)
Connectable to BMS system:
Protocol interface: Modbus RTU
protocol, CAN protocol
Hardware interface: RS485,
CAN
Baud rate: 9600,
Starting bit: 1,
Data bit: 8,
Parity bit: without,
Stopping bit: 1
Main components: Modbus
Gateway(Pro), User’s Manual.
Photoelectric
isolation
repeater
Photoelectric
isolation
repeater RS485
A repeater shall be added for
every excessive 800m length of
communication wire. A repeater
shall be added for every
excessive 30 Modbus gateway.
The repeater is optional when
these conditions are met
Photoelectric
isolation
converter
Photoelectric
isolation
converter GD02
The converter is optional when
BMS adopts RS232 way
2.2 Gateway ME30-24/E5(M)
2.2.1 General Functions
Gree Modbus Gateway(Pro) are intended to realize the data exchange between the air
conditioner and BMS, and provides ten I/Os (five inputs are DI1, DI2, DI3, DI4, DI5 and five
outputs are DO1, DO2, DO3, DO4, DO5). DI1 is the fire alarm interface (when there is fire alarm
signal input, Modbus gateway will order all air conditioners to stop operation immediately). The
status of other I/Os is mapped to the specific objects of the Modbus bus and is defined by the user.
This gateway is applicable for Gree multi VRF system which adopts CAN protocol.
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