com_state
(Statement)
[Version 1.5 or later]
Gets the status of RS-232C or Ethernet port.
com_state [#<portnumber>,]<integervar>
When the port number has not been specified, controller RS-232C is selected.
This command gets bytes of data remaining in the transmission buffer, into the integer variable specified by <integervar>.
Note that -1 will be returned if a transmission port error occurs. At the time of Ethernet use, -1 will be also returned if network connection of the port is not established.
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'!TITLE "<Title>"
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PROGRAM sample
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com_state #1,I280
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'Gets data remaining in transmission buffer into I280
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END
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