Mitsubishi FR-A800

(N) Operation via communication and its settings
564
PARAMETERS
[Parameters related to communication with the RS-485 terminals]
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
page 571.)
• 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.
Parameter
number
Name
Initial
value
Setting
range
Description
331
N030
RS-485
communication station
number
0
0 to 31
(0 to 247) 
Set the inverter station number. (Same specifications as
Pr.117)
332
N031
RS-485
communication speed
96
3, 6, 12, 24,
48, 96, 192,
384, 576, 768,
1152
Select the communication speed. (Same specifications as
Pr.118)
N032
RS-485
communication data
length
0 0, 1 Select the data length. (Same specifications as P.E022)
N033
RS-485
communication stop
bit length
1 0, 1 Select the stop bit length. (Same specifications as P.E023)
333
RS-485
communication stop
bit length / data length
1 0, 1, 10, 11
Select the stop bit length and data bit length. (Same
specifications as Pr.119)

334
N034
RS-485
communication parity
check selection
2 0, 1, 2
Select the parity check specifications. (Same specifications as
Pr.120)
335
N035
RS-485
communication retry
count
1 0 to 10, 9999
Set the permissible number of retries for unsuccessful data
reception. (Same specifications as Pr.121)
336
N036

RS-485
communication check
time interval
0 s
0
RS-485 communication is available, but the inverter trips in the
NET operation mode.
0.1 to 999.8 s
Set the interval of the communication check (signal loss
detection) time. (Same specifications as Pr.122)
9999 No communication check (signal loss detection)
337
N037

RS-485
communication
waiting time setting
9999
0 to 150 ms,
9999
Set the waiting time between data transmission to the inverter
and the response. (Same specifications as Pr.123)
341
N038
RS-485
communication CR/LF
selection
1 0, 1, 2
Select the presence/absence of CR/LF. (Same specifications as
Pr.124)
 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.
 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 page 579.)
 In the Modbus-RTU protocol, this is invalid.