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Cannot control 515 pump in MassLynx with SFO or PCM - WKB24997

Article number: 24997


  • No control of the 515 as a makeup pump in an Autopurification System controlled/configured in MassLynx.  
    • Cannot control the 515 pump from the inlet method, but the pressure reading is displayed.
    • The 515 pump in local mode is able to flow and read pressure.
    • That same pressure displays as a readback in the additional status page.
  • There is an IEEE cable connected to the GPIB card. National Instruments GPIB driver v2.8.1 is installed.
    • The National Instruments Measurement & Automation Devices & Interfaces section and scanned instruments appear to be good.
  • When scanning the inlet pump control configuration:  
    • The pump control module eventually appears, but there is a lag.
    • There is no serial number. There is no version. The address shown is 5.
    • Can select the PCM@5 as the makeup pump. There is a second 515 pump being used at column dilution.
  • When powering-off the 515 pump, a "fatal error Pump@5" message appears.
  • Waters Pump Control ICS was removed and reloaded.



  • System Fluidics Organizer with Pump Control Module
  • 515 Isocratic Pump
  • MassLynx


The 515 pump defaults back to RUN mode when the SFO is rebooted.

  • The 515 loses communication with the PCM temporarily when either pump or PCM power is cycled.


  1. In order to work with software control, the 515 pump must be placed in Remote/Run mode from the front panel of the pump. 
  2. This needs to be done each time the pump is powered-on or when communications to the PCM are lost.  
    • The upper-right area of the pump display alternates between REM and RUN when the pump is in the correct mode.


Confirmation of communication with the PCM:

  1. Shut down MassLynx and run the StopMassLynxProcesses.cmd from the "C:\Program Files\Waters Instruments\Bin\" folder (this ensures that nothing is running in the background and saves a reboot). 
  2. Start the National Instruments Measurement & Automation program.
  3. Open the Devices & Interfaces section.
  4. Right-click on GPIB0 and select Scan for Instruments.
  5. Multiple instruments are listed with a PAD of 5. These are the PCM. If you see this, the GPIB is working and the cabling to the PCM is OK.
  6. Close Measurement & Automation.

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