If the total length of your cab bus or any single cab bus cable is 30 feet or more from the command station you will need to inject power into the cab bus to make sure you get a clean signal with a minimum 8v gets out to the devices on the cab bus.
The overall goal is this: A minimum of 8v DC as measured on the UTP Panel and cab bus cables between pins 2 (-)/ GND and pin 5 (+12VDC) / (Black and Yellow.)
If you do not own a multimeter here is a link to an inexpensive one from Home Depot - http://www.homedepot.com/p/Powerbuilt-Digital-Multi-Meter-648349/204505225
5240207 The “old” UTP - 1/8inch (3.5mm) (Mono mini headphone jack) on the back of the UTP. The tip of the plug is positive (+) and the sleeve is negative.
Go here for the plug from Digi key -
|Digi-Key Part Number||CP3-1005-ND|
5240207 UTP V2 -2018 onward
If your layout requires a cab bus longer than this we suggest adding extra power to the bus at about 30-40 foot intervals. This is easily done by plugging a 12-14VDC power supply in to the 5.5/2.5mm jack on the back of the UTP. The center pin is positive (+) and the sleeve is negative. We recommend the NCE P114 (p/n 5240221) or other power supply in the range of 12 to 14 volts DC with a capability of at least ½ to 1 Amp. IMPORTANT: When adding a power supply to the UTP you MUST cut the circuit trace marked with an “X” on top of the circuit board.
5240234 UTP-Cat5 Additional power for the Cab Bus can be added to the socket in between the Cat5 sockets. We suggest a 1/2 to 2 Amp, 12 to 14 Volt, Regulated DC power supply such as the NCE P114. (5.5/2.5mm plug center +)
If you have an old UTP but want to add the P114 for added cab bus power, you will need to hack off the end and add the male 1/8inch (3.5mm) (Mono mini headphone plug) or solder the P114 directly to the board
Additional power for the Cab Bus can be added to the socket in between the Cat5 sockets. We suggest a 1/2 to 2 Amp, 12 to 14Volt, Regulated DC power supply such as the NCE P114. (5.5/2.5mm plug center +) The switch on each UTP-Cat5 should always be in the NORM POWER position.
Only switch it to EXT POWER on panels that have an additional power supply connected. Please Note: The UTP-Cat5 printed circuit board is marked on the upper, right corner that says CMD STA with an arrow. This indicates that the cable from the Command Station (Cat5 or six wire) should plug in here.