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5 Serial Gateway
5-8
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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Serial Gateway Send Start Timeout Monitoring Time
When a command is converted to the specified protocol and sent during protocol macro execution,
the time is monitored from when the command is received until it starts to be sent in the converted
protocol.
0: 5 s (default), Setting range: 1 to 255 (0.1 to 25.5 s)
The send start monitoring time is 5 s when set to the default setting, or can be a user-specified time
set in the range 0.1 to 25.5 s by setting between 1 and 255.
If a timeout occurs, a command end code (0204hex (Remote node busy)) is returned to the com-
mand source. Send processing will not be executed and the received command will be discarded.
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Port 1 and Port 2 Setting Changing Flags
It is possible to change communications settings and restart the Serial Communications Unit ports
by changing these flags from FALSE to TRUE with an Out instruction. These flags will automatically
turn to FALSE when the settings are changed and the communications ports are restarted.
These flags are used both to change the communications port settings and to restart the communi-
cations port at the same time. Accordingly, in cases where these flags are changed to TRUE only to
restart a communications port by using an Out instruction or other instruction, you can change these
flags to TRUE without changing the System Settings of the device variable for CJ-series Unit.
List of System-defined Variables (** corresponds to the unit number.)
5-2-2 System-defined Variable
System-defined variable Type R/W Name Function
_CJB_SCU**P1ChgSta BOOL RW Serial Communi-
cations Unit Port
1, Settings Chang-
ing Flag TRUE: Port 1 Communications Unit
Port Settings Change
FALSE: All other statuses
Default: FALSE
_CJB_SCU**P2ChgSta BOOL RW Serial Communi-
cations Unit Port
2, Settings Chang-
ing Flag TRUE: Port 2 Communications Unit
Port Settings Change
FALSE: All other statuses
Default: FALSE