August 2013 2-30 P/N 06-236530-001
2-16 USB COMMUNICATIONS PORT
The ARIES Control Unit has one USB communications port to act as a device for a laptop
computer being used to upload and download a system configuration or to download the
event logs.
The USB port connects to the laptop computer via a standard USB cable.
Note: When using the USB port, the ground fault circuitry is not functional. The USB port is to
be used to download configurations and operating system software only. It is not
intended to be used on a permanent basis. A ground fault will be reported if the USB cable
is connected and no communications activity has occurred for 30 minutes. Do not
connect or disconnect the USB cable while the control unit is powering up on system
startup or initializing after a new configuration upload.
Figure 2-32. USB Communications Port
2-17 NETWORK INTERFACE CARD
The Network Interface Card (NIC) contains the circuitry for data communications between
networked ARIES Control Units. One NIC is required for each networked control unit, and the
control units transmit and receive messages via the RS-485 format.
The NIC supports Class-B, Style-4 or Class-A, Style-7 interconnecting wiring, and acts as a
repeater to boost and regenerate the communications signals. One wire on each
communications channel is an isolated, floating RS-485 transceiver and the other wire is a non-
isolated, grounded RS-485 transceiver. This isolates the chassis of the networked control units
to enable ground-fault detection and to eliminate ground loops.
Specifications for the NIC are provided in Table 2-3.
Table 2-3. Network Interface Card Specification
Description Specification
Part Number 74-600000-009
Weight .34 lb/.15 Kg
Input Voltage (From Main PCB) 5.0 VDC
Input Current 300 mA Max @ 5 VDC, 70 mA from 24 VDC Supply
Electrical Field Connections UL Recognized Terminal Blocks for wire size 26 – 12 AWG
Data Ports EIA/TIA-485
Baud Rate 9600 Baud
Temperature Range 0 – 50 Deg C
Humidity Range 0 – 93% RH, non-condensing
USB B
J6
USB Device Port
(to PC for
configuration
upload/download)
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