264
Serial Communications Section 6-3
2. The FINS command is transmitted from the PLC with a host link header
and terminator attached. A program must be prepared in the host comput-
er to analyze the FINS commands and return the proper responses.
Procedure
Host Link Commands The following table lists the host link commands. Refer to the C-series Host
Link Units System Manual (W143) for more details.
Set the PLC Setup from a Pro-
gramming Device.
(Settings such as the communica-
tions mode and parameters.)
Programming Console
Peripheral port: Addresses 144, 145, and 147
RS-232C port: Addresses 160 to 163
Be sure to set the communications mode to host link.
(Refer to CX-Programmer User Manual for CX-Programmer procedures.)
Power OFF
Connect the host computer and
CPU Unit.
Set the DIP switch on the front of
the CPU Unit.
Turn pin 4 ON when using the peripheral port.
Turn pin 5 OFF when using the RS-232C port.
Power ON
Host computer to PLC
PLC to Host computer
Issue host link
commands from
the host computer.
Issue FINS
commands from
the host computer.
Execute SEND/RECV/CMND
instructions in the PLC’s program.
Receive responses in the host
computer. (A program is required in
the host computer.)
Header
code
Name Function
RR CIO AREA READ Reads the contents of the specified number of CIO Area words, starting
from the specified word.
RL LINK AREA READ Reads the contents of the specified number of Link Area words, starting
from the specified word.
RH HR AREA READ Reads the contents of the specified number of Holding Area words,
starting from the specified word.
RC PV READ Reads the contents of the specified number of timer/counter PVs
(present values), starting from the specified timer/counter.
RG T/C STATUS READ Reads the status of the Completion Flags of the specified number of
timers/counters, starting from the specified timer/counter.
RD DM AREA READ Reads the contents of the specified number of DM Area words, starting
from the specified word.
RJ AR AREA READ Reads the contents of the specified number of Auxiliary Area words,
starting from the specified word.