Omron SYSMAC CV1000 User Manual

3
Double-check System All communications are subject to a parity check and frame check sequence
(FCS) to help eliminate almost all transmission data errors.
Two Communications Ports The Host Link Unit incorporates two communications ports: a 25-pin RS-232C
port and a 9-pin RS-232C or RS-422 (selectable) port. It is possible to use these
two ports simultaneously, thus allowing the Host Link Unit to connect to two host
computers.
Although the host interface on the CPU allows a host computer to send com-
mands to PCs and the PCs to respond to the commands, the PC cannot send
commands to the host computer. The Host Link Unit, however, makes it possible
for the PCs to send commands to the host computer, thus enabling commands
generated by executing SEND(192), RECV(193), and CMND(194) instructions.
The Host Link Unit also enables any node on the network to send commands to
the host computer, even across multiple network levels.
Note The communications delay varies with the baud rate, the amount of data, and
the PC’s execution method (i.e., synchronous or asynchronous). For example, if
the PC uses synchronous execution, the PC’s cycle time will increase transmis-
sion delays. If high-speed processing is required from the host, these factors
must be considered.
1-1-3 Differences between Host Interface and Host Link Unit
The following table lists the differences between host interface functionality on
the CPU and the functionality of the Host Link Unit.
Feature CPU host interface Host Link Unit
Number of
communications
ports
One: RS-232C/RS-422
(selectable)
Two: RS-232C port and
RS-232C/RS-422 port
(selectable)
Communications
method
Full duplex Half duplex or full duplex
(selectable)
Xon/Xoff control Unavailable Possible using full duplex
communications
CTS signal
control
Unavailable Possible to set the CTS signal
to ON (0 V) continuously.
Unit number Not required Set with the unit number
switch on the front panel.
Node number Set in the PC Setup The node number of port 2 is
set with the node number
switch on the front panel.
The node number of port 1 is
always set to 00.
Optical interface
connection
Power must be supplied from
an AC Adapter.
No AC Adapter is required as
long as port 1 is used because
power is supplied through the
connector.
Wrap
communication
test
Not supported Executed via DIP switch
setting. A connector must be
prepared for a wrap
communication test.
Operating
parameters
Set in the PC Setup. Set in the CPU Bus Unit
System Setup.
Sending
commands to
host computers
Not possible. Possible to send CV-mode
(FINS) commands.
Commands from PC to Host
Computers
Overview Section 1-1

Omron SYSMAC CV1000 Specifications

General

Brand	Omron
Model	SYSMAC CV1000
Category	Controller
Language	English