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Expanded System Configuration Section 1-3
Protocols The serial communications port protocol can be switched in the CPU Unit’s
PC Setup. Depending on the protocol selected, the following systems can be
configured to support serial communications.
Note The peripheral bus mode is used for Programming Devices other than Programming Consoles (e.g., CX-
Programmer).
Host Link System
(SYSMAC WAY Mode, 1:N)
The Host Link System allows the I/O memory of the PC to be read/written,
and the operating mode to be changed from a host computer (personal com-
puter or Programmable Terminal) by executing Host Link commands. Other
Programming Devices can also be connected via a computer using this mode.
Alternatively, it is also possible to send data from the CPU Unit of the CQM1H
to the host computer using TXD(––) instructions to initiate communications
from the PC. This mode is supported by the peripheral port and the RS-232C
Protocol Main connection Application Applicable commands,
communications
instructions
Programming Console bus Programming Console Communications between
Programming Console and
PC
None
Peripheral bus (see note) Programming Devices, e.g.,
CX-Programmer
Communications between
Programming Devices and
the PC from the computer
None
Host Link Personal computer
OMRON Programmable
Ter m i n al s
Communications between
the host computer and the
PC
Commands can be sent to a
computer from the PC.
Host Link commands/ FINS
commands
Commands can be sent to a
computer from the PC.
Protocol macro General-purpose external
devices
Sending and receiving mes-
sages (communications
frames) according to the
communications specifica-
tions of external devices
SYSMAC-PST is used to
create protocols by setting
various parameters.
PMCR(––) instruction
No-protocol communications General-purpose external
devices
No-protocol communica-
tions with general-purpose
devices
TXD(––) and RXD(––)
instructions
1:1 Data Link C-series PCs Shared link words between
PCs
None
NT Link (1:1) OMRON Programmable Ter-
minals
High-speed one-to-one
communications with a
Programmable Terminal
using direct access
None
NT Link (1: N) OMRON Programmable Ter-
minals
High-speed one-to-one or
one-to-many
communications with
Programmable Terminals
using direct access
None
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