18
4 Communication functionality
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs
MN012007EN March 2019 www.eaton.com
4.2 USB port
The PXR includes a micro-B form USB port on the front of the trip unit. This USB connection
is used in conjunction with your PC running the PXPM software to configure, control, and
test the trip unit. The USB host-side also supplies power to the electronics for configuration
when the circuit breaker is not carrying current or when no auxiliary power is applied and for
trip unit testing (both trip and no-trip). A commercial USB battery supply may also be used.
The USB port is covered by the clear, lockable cover to prevent unauthorized modification to
settings. Controlling physical access to the USB port is a key element in your comprehen-
sive cyber security plan.
4.3 External communications adapter modules (CAMs)
The PXR 20, 20D and 25 trip units are equipped to handle a flexible and modular system of
communication adapter modules (CAMs). These modules provide communication from the
trip unit to a field bus network. These modules mount on a DIN rail and wired into the trip
unit. Auxiliary power (24 V DC) is required for CAM module communications.
The following networks are supported at the time of manual publication:
network
module name
instruction leaflet
wiring harness
ETHERNET (Modbus TCP)
PXR-ECAM – MTCP
IL0131132EN
Field wired
PROFIBUS
PXR-PCAM
IL120009EN
Field wired
Please consult the respective instruction leaflet for details.
Please visit www.eaton.com/powerdefense and search for communications adapter modules
for current offerings.