(N) Operation via communication and its settings
[Parameters related to communication with the RS-485 terminals]
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.
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
stop bit length
stop bit length / data
parity check selection
check time interval
waiting time setting
0 to 31
Set the inverter station number.
(0 to 247)
(Same specifications as Pr. 117)
3, 6, 12, 24,
48, 96, 192,
Select the communication speed.
(Same specifications as Pr. 118)
Select the data length.
(Same specifications as P.N022)
Select the stop bit length.
(Same specifications as P.N023)
Select the stop bit length and data bit length.
0, 1, 10, 11
(Same specifications as Pr. 119)
Select the parity check specifications.
0, 1, 2
(Same specifications as Pr. 120)
0 to 10,
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)
0 to 150
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.
0, 1, 2
(Same specifications as Pr. 124)