Mitsubishi Electric FR-F820-00077 Instruction Manual page 640

(N) Operation via communication and its settings
[Parameters related to communication with the RS-485 terminals]
Pr.
331
N030
332
N031
N032
N033
333
334
N034
335
N035
336
N036
337
N037
341
N038
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 page 5-488.)
In the MODBUS® RTU protocol, this is invalid.
NOTES 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 5-478.)
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.
Upon delivery the FR-F800-E inverter models are not equipped with the RS-485 terminal block.
5 - 468
Initial
Name
value
RS-485 communication
station number
RS-485 communication
speed
RS-485 communication
data length
RS-485 communication
stop bit length
RS-485 communication
stop bit length / data
length
RS-485 communication
parity check selection
RS-485 communication
retry count
RS-485 communication
check time interval
RS-485 communication
9999
waiting time setting
RS-485 communication
CR/LF selection
Setting
Description
range
0 to 31
Set the inverter station number.
(0 to 247)
0
(Same specifications as Pr. 117)
3, 6, 12, 24,
48, 96, 192,
Select the communication speed.
384, 576,
96
(Same specifications as Pr. 118)
768,
1152
Select the data length.
0 0, 1
(Same specifications as P.N022)
Select the stop bit length.
1 0, 1
(Same specifications as P.N023)
Select the stop bit length and data bit length.
1 0, 1, 10, 11
(Same specifications as Pr. 119)
Select the parity check specifications.
2 0, 1, 2
(Same specifications as Pr. 120)
0 to 10, Set the permissible number of retries for unsuccessful
1
9999 data reception. (Same specifications as Pr. 121)
RS-485 communication is available, but the inverter trips
0
in the NET operation mode.
0.1 to Set the interval of the communication check (signal loss
0 s
999.8 s detection) time. (Same specifications as Pr. 122)
9999 No communication check (signal loss detection)
0 to 150 Set the waiting time between data transmission to the
ms, 9999 inverter and the response. (Same specifications as Pr. 123)
Select the presence/absence of CR/LF.
1 0, 1, 2
(Same specifications as Pr. 124)
Parameters