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Overview of Communications Commands Section 1-1
1-1 Overview of Communications Commands
Communications Commands Addressed to CS/CJ/CP/NSJ-series Units
A CS/CJ/CP-series CPU Unit or NSJ Controller can receive the following
communications commands.
C-mode Commands C-mode commands are specialized Host Link communications commands.
They are issued by a host computer and sent to a CPU Unit. The devices that
can be connected for serial communications are the CPU Unit, a Serial Com-
munications Unit, and a Serial Communications Board.
FINS Commands FINS commands are message service communications commands. They do
not depend on a particular transmission path. They can be used for communi-
cations on various networks (Controller Link, Ethernet, etc.) and for serial
communications (Host Link). They can be issued from a CPU Unit, Special I/O
Unit, or host computer, and they can also be sent to any of these. The specific
commands that can be sent depend on the destination.
This manual explains commands sent to CS/CJ/CP-series CPU Units and
NSJ Controllers, when the commands are issued from a CPU Unit or a host
computer connected by Host Link.
Note When the source of the commands is a CPU Unit, the FINS commands are
sent by means of CMND(490)/SEND(090)/RECV(098). When the source is a
host computer, the FINS commands are issued using Host Link protocol.
1-2 C-mode Commands
The following table lists the C-mode (Host Link) commands. For details, refer
to SECTION 4 C-mode Commands.
Communications commands
C-mode commands via Host Link
FINS commands
Via CMND(490)/SEND(090)/RECV(098)
Via Host Link
Type Header
code
Name Function
I/O memory
reading
RR CIO AREA READ Reads the specified number of words beginning with the
designated CIO word.
RL LR AREA READ Reads the specified number of words beginning with the
designated LR word.
RH HR AREA READ Reads the specified number of words beginning with the
designated HR word.
RC TIMER/COUNTER PV READ Reads the specified number of words of the timer/counter
PV beginning with the designated word.
RG TIMER/COUNTER STATUS
READ
Reads the specified number of words of the timer/counter
status beginning with the designated word.
RD DM AREA READ Reads the specified number of words beginning with the
designated DM word.
RJ AR AREA READ Reads the specified number of words beginning with the
designated AR word.
RE EM AREA READ Reads the specified number of words beginning with the
designated EM word.
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