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Serial Gateway Overview Section 3-6
Executing Smart Active Parts Using an NS-series PT (Sending Internal FINS Messages)
The Board/Unit converts the FINS messages to Modbus-RTU protocol for
sending in this operation.
Note (1) The FINS header contains the following information.
• Remote destination network address (DNA): Same as for CompoWay/F.
• Remote destination node address (DA1): Same as for CompoWay/F.
• Remote unit address (DA2): Same as for CompoWay/F.
(2) The contents of the Modbus-RTU command enclosed in the FINS mes-
sage that is sent is as follows:
Slave address (binary) + FUNCTION code (binary) + Communications
data (binary)
Start and CRC+End are not required when sending FINS. They are add-
ed automatically for serial communications.
Access from PT on Ethernet or
serial NT Link
Details Routing tables to treat serial
communications path as network
Note When the NS-series PT is con-
nected serially to the PC using
serial communications mode
(1:N NT Links), and the NS-
series PT sends FINS com-
mands encapsulated in NT Link
commands using Smart Active
Parts, the CPU Unit removes the
NT Link header, etc. from the
received command, converting it
to a FINS command, and trans-
fers the command to the Serial
Communications Board/Unit.
The Serial Communications
Board/Unit uses the Serial Gate-
way to convert the command into
the specified protocol. This oper-
ation enables serially connected
devices to access the Serial
Communications Board/Unit
from Smart Active Parts using an
NS-series PT.
Access via serial communications using
Modbus-RTU is possible from a PT con-
nected to the network by executing a
Smart Active Part that is connected seri-
ally, which automatically sends an internal
FINS command.
Optional
2804FINS header
Smart Active Parts
NS-series PT
Serial Communications Unit/Board
Ethernet
ORMON Inverter
RS-485 (Modbus-RTU)
CPU Unit
FINS message (sent internally)
Modbus-RTU
command
Modbus-RTU
command
Protocol
conversion
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