
73
Troubleshooting Your FP-25
Issue: The relative humidity reading does not match my humidity standard
(or the current weather report).
Action:
The relative humidity sensor is located adjacent to the flow stream in
the body of the FP-25. It is most accurate when there is a fresh flow of
air passing by it. Connect the FP-25 to an air sampler and check the
humidity reading after a couple minutes.
Serial Communications
Issue: My computer can't find the Alicat when it is connected.
Action: Check that the FP-25 is powered on. Check the "Ports (COM & LPT)"
category in Device Manager for an entry that says "USB Serial Port
(COM#)". If you don't see that entry, download and install the USB
driver from
Issue: I can't communicate to the Alicat when it is connected to my PC.
Action:
Check the "Ports (COM & LPT)" category in Device Manager for an
entry that says "USB Serial Port (COM#)". Make sure the COM number
matches the one your software is using to connect to the FP-25.
Check the FP-25 unit ID (MENU > SETUP > ADV SETUP > COMM SETUP > SERIAL
COMM > UNIT ID) to make sure you are addressing it properly with your
serial commands. Make sure the baud rate your software requires is
the one your FP-25 is using (MENU > SETUP > ADV SETUP > COMM SETUP >
SERIAL COMM > BAUD).
Issue: Serial communications are very slow or disconnected (FP-25BT).
Action:
If your FP-25BT is already communicating with the Alicat Connect
app over Bluetooth, your wired serial connection will not work
in most cases. Disconnect your FP-25BT from Alicat Connect and
reestablish serial communications through the USB cable.
Bluetooth Communications and Alicat Connect™
Issue: Which devices work with the FP-25BT's Bluetooth?
Action: The FP-25BT uses an app called Alicat Connect to communicate over
Bluetooth. This app is currently available for Android 5.0 or higher or
iOS 9 or higher mobile devices and is available as a free download
from Google Play and the App Store.
Issue: My mobile device can't find my FP-25BT.
Action: Do you have the Bluetooth antenna connected to your FP-25BT?
Also check that the antenna is active (MENU > SETUP > ADV SETUP > COMM
SETUP). On your mobile device, check the Settings menu to ensure
that its Bluetooth antenna is on.