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Instrument/Software Communication Problems



My instrument will not communicate with the MAS software.


Try these solutions in the order that they appear.

  1. Ensure that the MMS or vb battery has at least 30% charge.
  2. Ensure that your PC has at least one free COM port. For example, if your PC has two but one is used for the mouse and the other is used internally to drive a modem then you have none free! You should purchase and install a serial port card in your PC. They are cheap and available at all computer stores.
  3. Check that Windows has detected the ports and that it reports that each one is 'working properly' and has 'no conflicts'. This should be checked in the Control Panel>System under the Device Manager (each version of windows is slightly different).
  4. Connect the instrument via its cable to a free COM port on your PC and turn it on. If using a vb instrument, in Ascent/MAS VB select Options>Configure Comm Ports to use the automatic detection feature. If using an MMS or Profiler instrument, in MAS select Tools>Configure COM Port, set the baud rate to automatic and use the Test Port button for all of the available ports.
  5. Repeat the above for all free COM ports.
  6. Ensure that no software protection dongles are connected to the COM port you are using.
  7. If there is still no communication there may be a problem with your cable. First identify which type of cable you have from the two which have been produced. One has a screw ring to lock the connector at the MMS/vb instrument end; the other has a small push button.
  8. Now use a multimeter to check the continuity of the following lines:

  9. Now use the multimeter to check the insulation at the DB9 connector:
  10. Check between every pin and pin 5 (signal ground); there should be no connection. Check all pins, not just those in the table above. Flex the cable while performing the test.
  11. The screw-ring connectors are prone to becoming loose and making intermittent contact after a lot of use. Check the contacts for any obvious corrosion or looseness.
  12. If possible, repeat the above steps using a different PC.
  13. If there is still no communication then please send an e-mail to Help detailing the problem, including at least the following information:
    • The type of your MMS or vb instrument.
    • The version of firmware it is running (this should be displayed on the screen at power up).
    • The version of MAS software you have.
    • The type of PC you are using.
    • Which operating system it is using (e.g. Win 95, NT, ...).
    • How many COM ports it has and which ones are free.
    • Which type of comms cable you have (screw lock or button lock).
    • Whether you have been able to check the continuity of the cable or not.