Mitsubishi Electric 800 Series Instruction Manual page 485

[Parameters related to communication with the RS-485 terminals]
Parameter
number
331 RS-485 communication
N030 station number
332 RS-485 communication
N031 speed
N032 RS-485 communication
data length
N033 RS-485 communication
stop bit length
333 RS-485 communication
stop bit length / data
length
334 RS-485 communication
N034 parity check selection
335 RS-485 communication
retry count
*6
N035
336 RS-485 communication
check time interval
*6
N036
337 RS-485 communication
waiting time setting
*6
N037
341 RS-485 communication
CR/LF selection
*6
N038
*1 When "1" (MODBUS RTU protocol) is set in Pr.549, the setting range within parentheses is applied.
*2 When a value outside the setting range is set, the inverter operates at the initial value.
*3 When Pr.549 = "2" (BACnet MS/TP protocol), the setting range is "96 to 1152".
*4 In the MODBUS RTU protocol, the data length is fixed at 8 bits.
*5 In the MODBUS RTU protocol, Pr.334 setting is applied as the stop bit length. (Refer to
*6 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.
484
5. PARAMETERS
5.12 (N) Operation via communication and its settings
Name Initial
value
0
96
0
1
1
2
1
0 s
9999
1
page 492.)
Setting range
0 to 31 (0 to Set the inverter station number. (Same specifications as Pr.117)
*1*2
247)
3, 6, 12, 24, Select the communication speed. (Same specifications as
48, 96, 192, Pr.118)
384, 576, 768,
*3
1152
0, 1
Select the data length. (Same specifications as P.N022)
0, 1
Select the stop bit length. (Same specifications as P.N023)
0, 1, 10, 11 Select the stop bit length and data bit length. (Same
specifications as Pr.119)
0, 1, 2 Select the parity check specifications. (Same specifications as
Pr.120)
0 to 10, 9999 Set the permissible number of retries for unsuccessful data
reception. (Same specifications as Pr.121)
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)
0 to 150 ms, Set the waiting time between data transmission to the inverter
9999 and the response. (Same specifications as Pr.123)
0, 1, 2 Select the presence/absence of CR/LF. (Same specifications as
Pr.124)
Description
*4*5
page 500.)
*4
*5