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8 PARAMETER FUNCTIONS
8-12
(1) Communication specifications
Conforming standard RS-485 Standard conformance
Number of units connected 1 : N (max. 32 units)
Communication speed Selected between 19200, 9600 and 4800bps
Control protocol Asynchronous
Communication method Half-duplex
Character system ASCII (7 bits/8 bits) selectable
Stop bit length Selectable between 1 bit and 2 bits.
Terminator CR/LF presence/absence selectable
Parity check Selectable between presence (even/odd) and absence
Sumcheck Presence
Communicati
on data
Waiting time setting Selectable between presence and absence
(2) Communication operation functions
Setting a value other than 0 in Pr. 122 enables RS-485 communication with the
computer connected to the PU connector, allowing you to make operation and
parameter settings.
Setting Item Description
Start
Give a forward rotation operation, reverse rotation operation or stop
command.
Speed setting Set the running speed.
Monitor
You can read the motor speed, motor current, output voltage, drive
unit fault, or control circuit output terminal assignment function
activated.
Operation
Reset
Used to reset the drive unit. A reset from the terminal RES is also
valid. Reset operation is performed as set in Pr. 188 [Section 8.4].
Parameter write
and read
You can change or read each parameter value.
Parameter write is performed as set in Pr. 77 [Section 8.1].
Select the operation mode through serial communication.
Operation Mode Description
Mode
Instruction
Code
Data
Write HFB H0002
Communication
operation mode
Read H7B H0002
Start, speed setting and other
operation settings are made through
serial communication.
Mode
Instruction
Code
Data
Write HFB H0001
External
operation mode
Read H7B H0001
Start and speed setting are made
using the input signals from the
control circuit terminals.
The following operation is performed when a communication operation fault
occurs.
Operation
Location of Fault
Occurrence
Communication operation
mode
External operation mode
Motor operation stopped Motor operation stopped
Drive unit
Communication continued Communication continued
Whether motor operation is
stopped or continued depends on
the Pr. 75 [Section 8.2] setting.
Motor operation continued
Communication
(Computer or
communication
cable)
Communication stopped Communication stopped