3. Troubleshooting Remote Communication
3.1 No Response from the Dispenser
1. Check that the dispenser is powered ON.
Power
Switch
2. Check that the cable connections between the client and the dispenser are firmly and properly secured.
3. Check that the dispenser Comm Port Settings match the COM port you are trying to use: Front Port Enabled /
Rear Port Enabled checkbox and Baud Rate. Refer to “Communications Port Options Screen” on page 26 for
details.
4. Ensure that the cable used for communication is not a null-modem / cross cable. Use only a DB9-female-to-
DB9-female straight-through cable.
5. Check that the COM port is present in the Device Manager and that you are using the correct COM port. In the
example below, the correct port is COM17. If multiple COM ports appear, unplug and replug the adapter to see
which COM ports disappear and reappear.
Appendix B — RS‑232 Protocol (continued)
Ultimus V High Precision Fluid Dispenser
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