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172 HVAC Drive H300
Issue Number: 3
10 Building Automation
10.1 Introduction
The HVAC drive H300 supports the following protocols:
• Modbus RTU
• BACnet MSTP
• Metasys N2 Open
As standard the H300 Drive is provided with a 2 wire EIA-485 interface located beneath the control terminals (see Figure 10-1). All three protocols
use this communication interface.
Figure 10-1 Location of the comms connector
Table 10-1 Serial communication port pin-outs
10.2 Building automation network communications set up parameters
10.2.1 Serial Address
Serial Address (Pr 11.023) selects the MAC/Node Address for all protocols.
Table 10-2 Protocols
If a MAC address is selected that is greater than or less than those allowed by the currently selected protocol then the actual address used will be the
maximum valid address value. The parameter value will change to reflect the value being used.
*The BACnet module is a master device. As such it will instigate an I-Am broadcast message onto the BACnet network at power-up and on each
subsequent drive reset.
Pin Function
1RX TX
2 Isolated 0V
3RX\ TX\
Allowable MAC Address Values
Protocol Master / Slave Minimum Maximum Broadcast
Modbus RTU Slave 1 247 0
BACnet* Master 0 127 255
MetaSys N2 Slave 1 255 0
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