RS-485 User's Manual MEH448d - Fuji Electric America

No response error detection time (y08, y18)
In a system designed to be sure to access a
station (inverter) managed by a host within a
specific period of time, access may be lost during
RS-485 communications due to wire disconnec-
tions. In such a case, the inverter starts the
operation of communications error set up by y02
and y12 if the inverter detects the symptom and
access is still lost even after the communications
disconnection detection time has passed.
Response interval (y09, y19)
2-24
Table 2.13 No response error
detection time
Data Function
0 No response error
detection disabled
1 to 60 Detecting time from 1
to 60 seconds
Set the time from the completion of receipt of a request from the host, to the return of response
to it. Even in a slow processing device, timing can be adjusted by changing the response
interval time.
- Data setting range: 0.00 to 1.00 (second)
Host Request
Inverter Response
t1
t1 = Response interval time + α
α: The processing time within the inverter. It depends on the timing and command given.
For further information, see the procedure for each protocol on the host below:
Modbus RTU protocol → Chapter 3 "3.2 Host Side Procedures"
Fuji general-purpose inverter protocol → Chapter "4.2 Host Side Procedures"
- Setting when FRENIC Loader is connected
Set the response interval time according to the performance and conditions of the personal
computer and converter (RS-232C TO RS-485 converter, etc.).
(Some converters monitor the communications status and use a timer to switch
transmission/receiving.)
Protocol select (y10, y20)
Select a communications protocol.
- Setting when FRENIC Loader is connected
Select the protocol for FRENIC Loader
commands (y10 = 1).
Table 2.14 Protocol select
Data Protocol
0 Modbus RTU
1 FRENIC Loader
(supported by y10 only)
2 Fuji general-purpose inverter
3*1 N2 Protocol
*1 Applicable only with FRN□□F1□-□A,
FRN□□F1□-□C, FRN□□F1□-□E and
FRN□□F1□-□U