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Serial Gateway Overview Section 3-6
• Remote destination network address (DNA)
• With routing tables that treat serial communications path as a network:
Network address corresponding to serial port in the routing tables.
• Without routing tables that treat serial communications path as a net-
work: Unit address of serial port.
• Remote destination node address (DA1)
• With routing tables that treat serial communications path as a network:
Unit number for Host Link incremented by 1 (1 to 32)
• Without routing tables that treat serial communications path as a net-
work: Unit number for Host Link incremented by 1 (1 to 32)
• Remote destination unit address (DA2)
Any unit address except that for the serial port (The destination for the
FINS message must not be the serial port of the Board/Unit.)
• FINS command code: Any
(2) When creating Host Link FINS command frames using the CMND(490)
instruction, always set the unit number for Host Link incremented by one
(1 to 32) for the remote destination (send destination) node address
(word C+3, bits 08 to 15 of the CMND(490) instruction). Do not set the
unit number of the actual Host Link slave (0 to 31). Using the Host Link
unit number without incrementing by one will access the PC with the en-
tered Host Link unit number less one.
For example, specify the remote PC with Host Link unit number 2 by en-
tering 3 for the remote destination node address. If 2 is entered, the PC
with Host Link unit number 1 will be accessed.
To access a PC on a Host Link FINS network using the Serial Gateway
from CX-Programmer, however, enter the actual Host Link unit number,
without incrementing by one. (Select Change PLC, click the Display Se-
rial Gateway Guide Button, and set unit number in the Host Link
SYSWAY Settings field of the Serial Gateway Guide Dialog Box.
(3) The contents of the FINS command enclosed by the Host Link header
and terminator is as follows:
@+Host Link unit number + Host Link header FA + FINS header + FINS
command + Text + FCS + * + CR
3-6-7 Treating Serial Communications Paths as Networks
When the Serial Gateway is executed, routing tables are either required or
optional as follows:
• Routing tables are required to treat a serial communications path as a
network when converting FINS messages to Host Link FINS for serial
conversion via the network.
• Under other conditions, routing tables are optional.
The details are provided in the following tables.
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