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FINS Commands with Host Link Protocol Section 3-5
CPU Unit Directly Connected to Host Computer on a Network
Note 1. Host Link communications handle ASCII data, so data is sent and received
in ASCII. Hexadecimal values in FINS command and response frames
must, therefore, also be sent and received in ASCII when they are handled
using Host Link communications.
2. When a FINS command sent from a host computer or the CPU Unit (with
the CMND instruction) is received by a Serial Communications Board or
Unit with version number Ver. 1.2 or later, that PLC acts as the Host Link
Master and it can send the FINS command to a Slave PLC through the
Host Link system.
3. When the Ethernet option board (CP1W-CF41) is used, a FINS command
cannot be issued to Host Link via the Ethernet option board.
3-5-2 Overview of Command and Response Frames
When FINS commands and responses are sent or received using Host Link
communications, the frame must be preceded by a Host Link header and fol-
lowed by a Host Link FCS and terminator as shown below.
Command Frame Use the following format to send FINS command frames.
Note A FINS command frame also consists of the response wait time, the destina-
tion node address, the source node address, and other FINS command for-
mat data.
Host Link
FINS command
CPU Unit
SEND(090)
RECV(098)
CMND(490)
Network (Controller Link, Ethernet, etc.)
CPU Unit
CMND
FINS
FINS
FINS
Serial Communications Unit
Ver. 1.2 or later
Serial
Gateway
Sends FINS command
PLC (Host link Master)
Host link
header
Host link
terminator
Host link
header
Host link
terminator
PLC (Host link Slave)
Host Link header FINS command frame (See note.)
Host Link
FCS
Host Link terminator
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