Table of Contents
Advertisement
[RS-485 terminal communication related parameter]
Parameter
Name
Number
331
RS-485 communication
station number
332
RS-485 communication
speed
RS-485 communication
333
*1*2
stop bit length
RS-485 communication
334
*1
parity check selection
RS-485 communication
335
*1*3
retry count
RS-485 communication
336
*3
check time interval
RS-485 communication
337
*1*3
waiting time setting
RS-485 communication
341
*1*3
CR/LF selection
549
Protocol selection
*1
Invalid during the BACnet MS/TP protocol.
*2
For the Modbus-RTU protocol, the data length is always 8 bits and the stop bit depends on the Pr. 334 setting. (Refer to page 234)
For the BACnet MS/TP protocol, the data length is always 8 bits and the stop bit is always 8 bit.
*3
Invalid during the Modbus-RTU protocol.
*4
The Modbus-RTU protocol and BACnet MS/TP protocol are valid for only communication from the RS-485 terminals.
*5
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 192)
*6
The inverter works with the initial value if a value other than the setting range is set.
...... The specification differs according to the manufacture date. Refer to page 399 and check the SERIAL.
CAUTION
⋅ If communication is made without Pr. 336 RS-485 communication check time interval being changed from "0" (initial value), monitor,
parameter read, etc. can be performed, but the inverter results in an alarm as soon as it is switched to the NET operation mode.
If the operation mode at power ON is the Network operation mode, a communication fault (E.SER) occurs after first
communication.
When performing operation or parameter write through communication, set "9999" or more to Pr. 336. (The setting depends on
the computer side program.) (Refer to page 226)
⋅ Always reset the inverter after making the initial settings of the parameters. After you have changed the communication-related
parameters, communication cannot be made until the inverter is reset.
Initial
Setting Range
Value
Pr. 549
0
(Mitsubishi
0 to 31
protocol)
0
1
0 to 247
(Modbus-RTU)
2
0 to 127
(BACnet)
Pr. 549
0
(Mitsubishi
3, 6, 12, 24,
protocol)
48, 96, 192,
96
1
(Modbus-RTU)
2
96, 192,
(BACnet)
384, 768
1
0, 1, 10, 11
2
0, 1, 2
1
0 to 10, 9999
0
0s
0.1 to 999.8s
9999
9999
0 to 150ms, 9999
1
0, 1, 2
0
1
1
2
Communication operation and setting
Description
*6
Set the inverter station number. (same
specifications as Pr. 117 )
*6
Used to select the communication speed.
384
(same specifications as Pr. 118 )
*6
*6
Select stop bit length and data length.
(same specifications as Pr. 119)
Select the parity check specifications.
(same specifications as Pr. 120)
Set the permissible number of retries at
occurrence of a data receive error.
(same specifications as Pr. 121)
RS-485 communication is available, but the
inverter trips in the NET operation mode.
Set the interval of communication check
time. (same specifications as Pr. 122)
No communication check
Set
the
waiting
transmission to the inverter and response.
(same specifications as Pr. 123)
Select presence/absence of CR/LF.
(same specifications as Pr. 124)
Mitsubishi inverter (computer link) protocol
Modbus-RTU protocol
BACnet MS/TP protocol
time
between
data
*4
*4
4
217
Advertisement
Table of Contents
