C-863.12 Mercury Controller MS249E Version: 1.2.1 257
Fault: Positioner is already oscillating during the reference move
and switch off the servo mode by removing the tick from
the respective check box in the single axis window.
7. Enter new values for the servo control parameters, see
"Optimizing the Servo Control Parameters" (p. 66).
8. Restart the reference move.
9. If the positioner is still oscillating, repeat steps 6 to 8 until
the reference move has completed successfully without
oscillation.
Fault: There is no communication between the controller and the PC
The wrong communication
cable is used or it is defective
➢ Use a null modem cable for the RS-232 connection.
➢ If necessary, check whether the cable works on a fault-free
system.
Baud rate not configured
correctly
➢ Check the settings of DIP switches 5 and 6 for the baud rate
(p. 53).
➢ In a daisy chain network make sure that the same baud
rate is set for every controller.
Controller address not
configured correctly
➢ Check the settings of DIP switches 1 to 4 for the controller
address (p. 52).
Another program is accessing
the interface.
➢ Close the other program.
Problems with special
software
➢ Check whether the system works with other software, such
as a terminal program or a development environment.
You can test the communication by starting a terminal program
(e.g., PITerminal) and entering *IDN? or HLP?.
➢ Make sure that you end the commands with an LF (line
feed).
A command is only executed when LF has been received.
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