Mitsubishi Electric CR750-Q Instruction Manual page 371

[Explanation]
(1) This is a read only variable.
(2) The return value differ corresponding to the file type specified by Open command as follows.
Kind of files
File
Communication line
RS232C
(excluding CR750/
CR751 controller)
Communication line
Ethernet
[Related instructions]
Open (Open)
[Related parameter]
COMDEV, CPRE**, NETMODE
Meaning
Returns the status indicating whether or not a file is
opened.
Returns 1 until the Close instruction, the End instruction
or End in a program is executed after executing the Open
instruction.
Indicates the status of the counterpart of the
RS232C cable communication.
The CTS signal input status is returned as is.
The power off status and cable disconnection status of
the counterpart can be determined.
(Mitsubishi genuine cable specification: Can be used only
when the RTS signal of the counterpart is enabled using
model name RS-MAXY-CBL/RS-AT-RCBL.)
Indicates whether or not
connection is made with the
counterpart.
For server setting
For client setting
Detailed explanation of Robot Status Variable 4-351
4MELFA-BASIC V
Value
1: Already opened
-1: Undefined file number (not opened)
1: Already connected (CTS signal is ON).
0: Not connected (CTS signal is OFF).
-1: The file number is undefined (not
opened).
1: Client is already connected.
0: Client is not connected.
-1: The file number is undefined (not
opened).
1: Already connected to the server. (Con-
nection has been made.)
0: Not connected to the server. (Connection
has not been made. Equivalent to when
the server is down after being opened.)
-1: The file number is undefined. (When the
file has not been opened, or has been
opened while the server is down.)