Chapter 11 RS485 Communication
11-4-4
Starting from the start of reception wait, a timeout occurs if data reception cannot be completed
within the set time of "RS485 communication timeout [C077]" (t3 in the above figure). In this
case, the operation follows "RS485 communication error selection [C076]".
If a setting other than "Ignore (02)" is set to [C076] in the administrator inverter, communication
between inverters stops when a communication time-out occurs in the administrator inverter. In
this case, turn on the power to the administrator inverter again.
Be sure to set a value other than 0.00 (recommended 1 second or longer) for [C077] of the
Administrator inverter. If 0.00 is set, EzCOM function will be stopped if no data from the master
inverter can be received. If it stops, turn on the administrator inverter again.
The master switching command is sent from the administrator inverter at the following timing.
- When the administrator inverter is a master inverter, after t1 in the figure above has elapsed
from complete of data write communication
- When the administrator inverter is a slave inverter, after t2 of the above figure has elapsed
after completion of data transmission communication reception
Do not set 08FFh (Write EEPROM (0900h – 1)) or 0901h (EEPROM write mode selection
(0902h - 1) to the destination register.
In the data write communication by the master inverter, the destination slave node address is
set, but it is actually transmitted to all stations by broadcast communication. The received data
is discarded in the slave that is not specified as the destination by the master.
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