Error 301 occurs when the master controller tries to send a command to a specific module (like a valve or a pump) but the message fails to deliver.
You will receive Error 301 when the master controller is unable to successfully "talk" to a module on the system. This is essentially an outgoing communication failure. Because the command didn't go through, this error is typically followed immediately by Error 302 and Error 401.
The most frequent cause for this error is a mismatch between the tablet configuration for the machine and the actual physical hardware. If the tablet software expects to find a specific device (like a 3rd flowmeter or an extra valve) that isn't physically present or powered on, it will throw a 301 when it tries to communicate with it.
Use Diagnostics Mode: This is the best way to pinpoint the problem. Navigate to Diagnostics Mode and activate each hardware item one at a time. When the error pops up, you have found the specific part that is misconfigured or disconnected.
Communication messages can fail if the system voltage is too low to power the chips inside the modules. Check the voltage on your tablet; if it is below 12.3V, the system may be unstable.
Reboot the Mixmate: Power the system off and back on to refresh the master controller's connection list.
Check All Cables: Ensure all plugs are seated firmly and are free of corrosion or moisture.
Poor electrical resistance on the communication lines can cause messages to fail or "bounce."
To test the resistance:
SHUT OFF ALL POWER to the Mixmate.
Locate the Power Module (white box).
Using a digital multimeter, measure the resistance between the GREEN and YELLOW wires.
Resistance Standards:
~60 Ohms: Healthy system (Two terminators detected).
~120 Ohms: One terminator is missing or failed.
70–135 Ohms: Intermittent communication errors like 301 are very likely.
<50 or >135 Ohms: The system will not function at all.