Fuji Electric FRENIC-AQUA series User Manual page 17

Table 2.1 RS-485 communications specifications (continued)
Item
Protocol
Complying with
No. of supporting
stations
Physical level
Connection to
RS-485
Synchronization
method of character
Transmission mode
Bus topology
Maximum
transmission cable
length
Maximum
transmission cable
length
No. of available
station addresses
Message frame
format
Synchronization
method of
transmission frames
Frame length
Messaging system
Transmission
character format
Character length
Parity
Stop bit length
Error checking
Table 2.2 Connection method and applicable protocol for FRENIC series
Communi- Connection
Model
cations means
Keypad
connection
connector on connector
FRENIC-
inverter unit
HVAC/
Control circuit
AQUA
terminal block Terminal
on inverter
unit
*1 Metasys N2 or BACnet cannot operate both the standard and extension ports at the same time.
*2 Only the dedicated keypad can be connected to the FRENIC-HVAC/AQUA.
Metasys N2
Metasys N2 developed by Johnson
Controls
Host device: 1
Inverters: up to 31
EIA RS-485
Connect using the RJ-45 connector or terminal block
Start-Stop system
Half-duplex
Master-Slave
9600
500 m
1 to 255
Metasys N2
Timing-synchronization
Variable
Polling/Selecting/Broadcast
ASCII, 7 bits fixed
8 bits (fixed)
No parity (fixed)
1 bit (fixed)
Checksum
Hardware
specifications
for Port type Keypad
port
connection
port
RJ-45 See Section Standard
2.1.1. port
See Section Extension
block 2.1.2. port
Specification
BACnet
ANSI/ASHRAE Standard 135-1995
Master-Slave/Token Passing (MS/TP)
9600, 19200 and 38400
0 to 127
BACnet
501 octets max.
CRC
Applicable protocol *1
Modbus
Loader
*2 RTU
√ √ √
√ √
--
2-2
Fuji general-
purpose Metasys
BACnet
inverter
N2
protocol
√ √ √
√ √ √