User's Manual

Rajant Corporation BreadCrumb® ME4 v11 User Guide
03-100126-011 Version 11.0.0
2.4 26-Pin Amphenol Connector
The majority of the signals and features of BreadCrumb ME4 can be accessed through the 26-pin
Amphenol connector on the enclosure (see Figure 2). The most important of these interfaces are
external power, Ethernet, and USB, which are described in more detail in the following sections. The
26-pin Amphenol connector interfaces to the ME4 cable assembly that provides access to input power,
Ethernet and USB ports of the device.
2.4.1 Power
The input power interface to the BreadCrumb ME4 resides on the 26-pin Amphenol connector (see
Figure 2). The device accepts external power in the range of 8 to 48 VDC. The average idle power
consumption of BreadCrumb ME4 is 5.5 W at 24 V. The maximum peak power consumption of
BreadCrumb ME4 is 19 W at 24 V.
2.4.2 Ethernet
The first Ethernet port (eth0) on the BreadCrumb ME4 supports 10 Base-T, 100 Base-TX or 1000 Base-
T configuration. The second Ethernet port (eth1) supports 10 Base-T, or 100 Base-TX configuration.
Both Ethernet ports can be accessed through the 26-pin Amphenol connector on the enclosure (see
Figure 2). Both ports support Auto MDI/MDIX allowing the use of either straight-through or crossover
data cables for connections. The data interface includes electrostatic discharge, and electrical fast
transient/burst immunity compliant to the IEC 61000-4-2, and IEC 61000-4-4-EFT standards,
respectively.
The ME4 cable assembly plugs into the 26-pin Amphenol connector and provides two standard RJ-45
Ethernet connectors for easy access to the the ME4 Ethernet ports.
2.4.3 USB
The ME4 contains one USB port, which can be access through the 26-pin Amphenol connector on the
enclosure (see Figure 2). The port is compliant to the Enhanced Host Controller Interface (EHCI) and
USB Transceiver 2.0 Macrocell Interface (UTMI+) Level 2 specifications. The port supports all three
standard data transfer rates of low speed (1.5Mbps), full speed (12Mbps), and high speed (480Mbps).
The power switch for the port includes over current protection, thermal protection, in-rush current
limiting, and hot-plug noise filtering.
The USB port can be used to perform BreadCrumb firmware upgrades and USB-based zeroize. It can
also interface to an optional GPS receiver accessory available from Rajant.
2.5 ME4 Cable Assembly
The ME4 comes with a standard cable assembly that connects to the BreadCrumb's 26-pin Amphenol
connector. The cable assembly includes two Ethernet ports and one USB port.
2.6 Status LED
The Status LED (see Figure 1) is capable of displaying warning and error codes, and link states. The
LED Mode can be configured in BC|Commander to be ON (switchable), ALERTS ONLY (switchable),
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