5-2
5.1.1 Common specifications
Items Specifications
Protocol FGI-BUS Modbus RTU Loader protocol
Compliance Fuji general-purpose
RS-485 communication
Modicon Modbus
RTU-compliant
Special commands
dedicated to Loader
(Not disclosed)
No. of supporting
stations
Host device: 1
Inverters: Up to 31
Max. transmission
cable length
500 m (1600 ft.)
No. of available
station addresses
1 to 31 1 to 247 1 to 255
Synchronization Start-Stop system
Message frame format FGI-BUS Modbus RTU Loader
Frame
synchronization
Detection of SOH (Start
Of Header) character
Detection of no-data
transmission time for
3-byte period
Detection of header
character (Start code
96H)
Transmission mode Half-duplex
Messaging system Polling/Selecting/Broadcast Command message
Transmission
character format
ASCII Binary
Character length 8 or 7 bits (selectable by
the function code)
8 bits (fixed)
Parity Even, Odd, or None
(selectable by the function code)
Even
Stop bit length 1 or 2 bits
(selectable by the
function code)
When "No parity" is
selected: 2 bits
When Even or Odd
parity is selected: 1 bit
1 bit (fixed)
Error checking Sum-check CRC-16 Sum-check
Transmission speed 2400, 4800, 9600, 19200, or 38400 bps 2400 or 4800 bps
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