Omron CQM1H - 08-2005 Operation Manual page 47

Expanded System Configuration
Protocols
Protocol
Programming Console bus
Peripheral bus (see note)
Host Link
Protocol macro
No-protocol communications General-purpose external
1:1 Data Link
NT Link (1:1)
NT Link (1: N)
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)
22
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.
Main connection
Programming Console
Programming Devices, e.g.,
CX-Programmer
Personal computer
OMRON Programmable
Terminals
General-purpose external
devices
devices
C-series PCs
OMRON Programmable Ter-
minals
OMRON Programmable Ter-
minals
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
Application
Communications between
Programming Console and
PC
Communications between
Programming Devices and
the PC from the computer
Communications between
the host computer and the
PC
Commands can be sent to a
computer from the PC.
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.
No-protocol communica-
tions with general-purpose
devices
Shared link words between
PCs
High-speed one-to-one
communications with a
Programmable Terminal
using direct access
High-speed one-to-one or
one-to-many
communications with
Programmable Terminals
using direct access
Section 1-3
Applicable commands,
communications
instructions
None
None
Host Link commands/ FINS
commands
Commands can be sent to a
computer from the PC.
PMCR(––) instruction
TXD(––) and RXD(––)
instructions
None
None
None