Mitsubishi Electric FR-F800 Instruction Manual page 451

(N) Operation via communication and its settings
[Parameters related to communication with the RS-485 terminals]
Parameter
Name
number
RS-485
331
communication station
N030
number
332 RS-485
N031 communication speed
RS-485
N032 communication data
length
RS-485
N033 communication stop
bit length
RS-485
333 communication stop
bit length / data length
RS-485
334
communication parity
N034
check selection
RS-485
335
communication retry
N035

count
RS-485
336
communication check
N036

time interval
RS-485
337
communication
N037

waiting time setting
RS-485
341
communication CR/LF
N038

selection

When "1" (Modbus-RTU protocol) is set in Pr.549, the setting range within parentheses is applied.

When a value outside the setting range is set, the inverter operates at the initial value.

When Pr.549 = "2" (BACnet MS/TP protocol), the setting range is "96 to 1152".

In the Modbus-RTU protocol, the data length is fixed at 8 bits.

In the Modbus-RTU protocol, Pr.334 setting is applied as the stop bit length. (Refer to

In the Modbus-RTU protocol, this is invalid.
NOTE
• The monitored items and parameter settings can be read during communication with the Pr.336 RS-485 communication
check time interval = "0 (initial value)" setting, but such operation will become faulty once the operation mode is changed to
the NET operation mode. When the NET operation mode is selected as the start-up operation mode, communication is
performed once, then a Communication fault (inverter) (E.SER) occurs. To perform operation or parameter writing via
communication, set "9999" or a large setting value in Pr.336. (The setting value is determined by the computer
program.)(Refer to
• Always reset the inverter after making the initial settings of the parameters. After changing the communication-related
parameters, communication cannot be made until the inverter is reset.
450
PARAMETERS
Initial Setting
value range
0 to 31
0
(0 to 247)
3, 6, 12, 24,
48, 96, 192,
96
384, 576, 768,
1152

0 0, 1
1 0, 1
1 0, 1, 10, 11
2 0, 1, 2
1 0 to 10, 9999
0
0 s
0.1 to 999.8 s
9999
0 to 150 ms,
9999
9999
1 0, 1, 2
.)
page 457
Set the inverter station number.
Pr.117)

Select the communication speed. (Same specifications as
Pr.118)
Select the data length. (Same specifications as P.E022)
Select the stop bit length. (Same specifications as P.E023)
Select the stop bit length and data bit length. (Same
specifications as Pr.119)
Select the parity check specifications. (Same specifications as
Pr.120)
Set the permissible number of retries for unsuccessful data
reception. (Same specifications as Pr.121)
RS-485 communication is available, but the inverter trips in the
NET operation mode.
Set the interval of the communication check (signal loss
detection) time. (Same specifications as Pr.122)
No communication check (signal loss detection)
Set the waiting time between data transmission to the inverter
and the response. (Same specifications as Pr.123)
Select the presence/absence of CR/LF. (Same specifications as
Pr.124)
page 465.)
Description
(Same specifications as


