Fuji Electric FRENIC-VG Series - Common Specifications

5-2
5.1.1 RS-485 common specifications
Items Specifications
Protocol SX protocol
(For FRENIC-VG Loader)
Modbus RTU Fuji general-purpose inverter
protocol
Compliance Loader dedicated protocol (Not
disclosed)
Modicon Modbus RTU-compliant Fuji general-purpose inverter
protocol
Protocol
selection
Function code H40 = "1" Function code H40 = "2" Function code H40 = "0"
Messaging
system
Command message RTU (Remote Terminal Unit) mode
only
ASCII mode not yet supported
Query/Broadcast message
Polling/Selecting/Broadcast
EIA RS-485 Electrical
specifications,
Transmission
speed
2,400 4,800 9,600 19,200 38,400 bps
Synchronization Asynchronous start-stop system (UART)
Transmission
mode
Half-duplex
Transmission
type
Direct link to inverter 1:N (1 ≤ N ≤ 31)
Transmission
character format
HEX ASCII 7 bits or 8 bits
Data length 8 bits (fixed) (Note 3) 8 bits (fixed) (Note 2) H35 data length setting
7 or 8 bits selectable
Stop bit 1 bit (fixed) (Note 3) 2 bits
(Note 2)
1 bit (Note 2) H37 stop bit setting
1 or 2 bits selectable
Parity Even (fixed) (Note 3) None Even Odd H36 parity setting
None, Even, or Odd selectable
Error checking Sum-check
(1 byte BCC)
CRC-16
Generator polynomial:
X
16
+ X
15
+ X
2
+ 1
Sum-check
(2 byte BCC)
Logical station
selection
1-255; logical station 0; Broadcast
1-247; logical station
99; Broadcast (Note 1)
1-31; logical station
Frame length Variable length Variable length
Normal transmission:
16 bytes (fixed)
High-speed transmission:
8 or 12 bytes (fixed)
Max. transfer
data (1 message)
Write: 16 words
Read: 99 words
Write: 16 words
Read: 99 words
1 word
Disconnection
detection time
Communication disconnection time (Timeout) can be set with function code H38. Operates only during
operation through 485.
Cable length Non-isolated: Max. 10 m
Isolated: Max. 500 m
* For isolation, use a commercially-available 485/485 isolating device (repeater), and a 485/232C isolated
converter.
* Inverters generate noise. Use a converter with superior noise resistance.
Recommended converters: KS-485PTI, KS-10PTI, USB-485I RJ45-T4P (System Sacom Sales Corporation)
(Note 1) For Broadcast, only communications command codes (S codes) are enabled. Other function codes are disabled.
(Note 2) With RTU protocol, H37 stop bit setting is not required because the stop bit is selected automatically in accordance with
the parity selection status (H36 parity setting).
(Note 3) With SX protocol, it is not necessary to change the H35-H37 settings because the data length, stop bit, and parity are fixed.