3
2 Communication specification
Item
Description
Interface
RS-485
Communication method
Half-duplex
Connectable units
Max.:31
Slave address can be set by DIP SW on the interface controller board.
SW 4-1
SW 4-2
SW 4-3
SW 4-4
SW 4-5
Slave adress
OFF
OFF
OFF
OFF
OFF
1
ON
OFF
OFF
OFF
OFF
1
OFF
ON
OFF
OFF
OFF
2
ON
ON
OFF
OFF
OFF
3
OFF
OFF
ON
OFF
OFF
4
ON
OFF
ON
OFF
OFF
5
•••
•••
ON
ON
ON
ON
ON
31
Baud rate
Selectable from: 1200/2400/4800/9600/19200/38400/57600
Baud rate can be set by DIP SW on the interface controller board.
SW 3-6
SW 3-7
SW 3-8
Details
OFF
OFF
OFF
1200bps
ON
OFF
OFF
2400bps
OFF
ON
OFF
4800bps
ON
ON
OFF
9600bps
OFF
OFF
ON
19200bps
ON
OFF
ON
38400bps
OFF
ON
ON
57600bps
ON
ON
ON
N/A
Transmission mode
RTU mode
Data length
8bit
Parity type
Selectable from: odd/even/none
Set by DIP SW on the interface controller board.
SW4-6
SW4-7
Details
OFF
OFF
Odd
ON
OFF
Even
OFF
ON
None
ON
ON
N/A
Stop bit
Slectable from: 1bit/2bit
OFF
ON
SW 4-8
1 bit
2 bit
3 Communication timing
3.1 Message sending interval
Data sending interval of Master
Request from
Master (query)
Request from
Master (query)
Response from Slave
(Response)
Note:
• Please send a query (or a operation command) every certain period. [10 seconds is recommended, but it΄s acceptable that interval is 10
seconds or more and less than 10 minutes.]
• "Drive ON/OFF" becomes available by remote controller when no query is received for more than 10 minutes
, in order to be able to turn on
and off in the case of Modbus communication failure.
3.2 Operation command interval
Operation command interval of Master
…
Response from Slave
(Response)
Operation command
from Master
Operation command
from Master
Note:
•
Please send next operation command
Min. 1 minute after
previous command regardless of the baud rate.
