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Serial Communications Section 6-1
6-1 Serial Communications
The FQM1 supports the following serial communications functions.
Protocol Connections Description Ports
Peripheral RS-
232C
RS-
422A
Host Link Host computer or
OMRON PT (Programmable Terminal)
Various control commands,
such as reading and writing
I/O memory, changing the
operating mode, and force-
setting/resetting bits, can be
executed by sending Host
Link (C-mode) commands or
FINS commands from the
host computer to the Coordi-
nator Module.
Use Host Link communica-
tions to monitor data, such as
status trace data, or to send
data, such as operating con-
ditions information, to the
FQM1.
OK OK Not al-
lowed
No-protocol Communicate with general-
purpose devices connected
to the RS-232C port without
a command–response for-
mat. The TXD(236) and
RXD(235) instructions are
executed from the program to
transmit data from the send
port or read data at the
receive port. The frame
headers and end codes can
be specified.
Not
allowed
OK Not al-
lowed
1:N NT Link
(The 1:N NT
Link commu-
nications are
used even
for 1:1 con-
nections.)
Data can be exchanged with
PTs without using a commu-
nications program in the
Coordinator Module.
OK OK Not al-
lowed
Serial PLC
Link Slave
Up to ten words per Module
can be shared with up to
eight Coordinator Modules
as slaves using a CJM1 CPU
Unit as the maser.
An RS-422A Converter can
be connected to the RS-
232C port on each Coordina-
tor Module to communicate
via RS-422A/485, or one
Coordinator Module can
communicate via an RS-
232C connection to the
CJ1M master.
The Serial PLC Links can
also include PTs as slaves
via NT Links (1:N) combined
with Coordinator Modules.
Not
allowed
OK Not al-
lowed
Monitor and
set parameters
Host computer
or
OMRON PT
(Programmable
Terminal)
General-purpose
external device
OMRON PT
(Programmable Terminal)
FQM1
FQM1
FQM1
RS-422A/485
RS-232C
CJ1M CPU Unit
Master
CJ1W-CIF11
connected to
RS-232C port
(See note.)
For NS-
series PT:
NS-AL002
8 Units max.
CJ1M CPU Unit
Master