Outline of Serial Communications Section 5-1
118
Note Refer to 2-3 I/O Memory Allocations in SYSMAC CS/CJ Series Serial Com-
munications Boards/Unit Operation Manual for the details of Serial Communi-
cations Boards/Unit settings.
Communications Settings for Serial Communications
Communications Settings
for Serial Communications
When using serial communications instructions in a program, communications
settings for each port number to be used can be specified. Serial communica-
tions settings include the following settings.
Communications
Settings
Contents
- Communications are not processed.
Messages Display the contents of messages that would be sent to
an external device. (Actually messages are not sent.)
File Write communications data to a file and read from the
file.
Actual communica-
tions
Possible to communicate in Host Link (SYSMAC WAY),
NT Link, or No-protocol via a COM port on the computer.
Operations of Auxiliary Area The table below shows differences in operation of Status Area and Auxiliary
Area when set as communications are not actually performed (“-
“/”Messages”).
Instruction Contents
TXD RS-232C Port Send Ready Flag Always ON
RS-232C Port Reception Completed Flag Always OFF
RS-232C Port Reception Overflow
Flag
Always OFF (No
error)
RXD
RS-232C Port Reception Counter Always 0
STUP RS-232C Port Settings Changing
Flag
Always OFF
Network Communications Error Flag Always OFF (No
error)
Network Communications Enabled Flag Disabled (OFF) at
command issue and
enabled (ON) at
peripheral servicing
in the same cycle.
Network instruc-
tions
SEND/RECV
/CMND
Network Communications Completion
Code
Cleared (always
normal status)
Save communications history to a file when serial communications are per-
formed with a COM port on the computer allocated. This function is available
when the communications setting for serial communications is set to “File” or
“Actual communications,” although disabled for NT Link.
COM Port Logging Function
· Folder PLC data folder\LOG
· Input file name COM port name LOG.txt
Error Logs
The error logs function of Serial Communications Boards/Unit is not available.
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