Chapter 12 Description of Parameter Settings
MH300
.1-09-2
COM1 Communication Protocol
Default: 1
Settings 1: 7, N, 2 (ASCII)
2: 7, E, 1 (ASCII)
3: 7, O, 1 (ASCII)
4: 7, E, 2 (ASCII)
5: 7, O, 2 (ASCII)
6: 8, N, 1 (ASCII)
7: 8, N, 2 (ASCII)
8: 8, E, 1 (ASCII)
9: 8, O, 1 (ASCII)
10: 8, E, 2 (ASCII)
11: 8, O, 2 (ASCII)
12: 8, N, 1 (RTU)
13: 8, N, 2 (RTU)
14: 8, E, 1 (RTU)
15: 8, O, 1 (RTU)
16: 8, E, 2 (RTU)
17: 8, O, 2 (RTU)
Control by PC (Computer Link)
When using the RS-485 serial communication interface, you must specify each drive’s
communication address in Pr.09-00. The computer then implements control using the drives’
individual addresses.
Modbus ASCII (American Standard Code for Information Interchange): Each byte of data is the
combination of two ASCII characters.
Communication Response Delay Time
Default: 2.0
Settings 0.0–200.0 ms
Sets the response delay time after the AC motor drive receives a communication command as
shown in the following.
PC or PLC command
Handling time
of the AC drive
Response Delay Time
Pr.09-09
Response Message
of the AC Drive
RS-485 BUS
Communication Main Frequency
Default: 60.00
Settings 0.00–599.00 Hz
When you set Pr.00-20 to 1 (RS-485 serial communication), the AC motor drive saves the last
Frequency command into Pr.09-10 when there is abnormal power off or momentary power loss.
After the drive reboots when power is restored, it checks the frequency in Pr.09-10 if no new
Frequency command is input. When a Frequency command of 485 changes (the Frequency
command source must be set as Modbus), this parameter also changes.
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