User's Manual

BreadCrumb
®
JR User Guide - PRELIMINARY Rajant Corporation
Version: 1.00-pre1 20-100035-001
The 10-pin Amphenol connector interfaces with the optional JR cable assemblies which provide
access to input power, Ethernet, GPS data, and 3.3 V output power (see section 1.3).
1.2.4.1 Input Power
The input power interface to BreadCrumb JR resides on the F (VIN) and K (GND) pins of the 10-pin
Amphenol connector (see Figure 4). The device accepts input power in the range of 10.5 VDC to 25
VDC.
The nominal power consumption of BreadCrumb JR is 3 W at 24 VDC. The actual power
consumption may vary between 2.5 W at 24 VDC when the device is idle, to 4.5 W at 24 VDC when
the device is operating at full duty cycle.
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Nominal power consumption is defined by the scenario in which the device
transmits 20% of the time and is idle the remaining 80% of the time. The idle
condition is defined as no transmit activity, and continuous idle operation. The full
duty cycle condition is defined as continuous transmit activity, and no idle
operation.
1.2.4.2 Ethernet
BreadCrumb JR contains one 10/100 Base-TX Ethernet port, which can be accessed through the C
(RX-), D (TX+), E (RX+) and J (TX-) pins of the 10-pin Amphenol connector (see Figure 4). The
port supports Auto MDI/MDIX allowing the use of either straight-through or crossover data cables
for connections.
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Figure 4: 10-Pin Amphenol Connector