Multiprotocol Serial Port Configuration Commands
There are two Multiprotocol Serial ports, cables labeled RS485_1 and RS485_2, implemented using a
Linear Technology (Analog Devices) LTC2872 “RS232/RS485 Dual Multiprotocol Transceiver with
Integrated Termination.” We recommend that the user downloads this datasheet, especially if using
RS422 or RS485 involving termination. The uC BIT Console Port allows you to configure several
functions including termination, full/half duplex, termination and port type selection.
ss Set port 1 to RS232
vs Set port 1 to RS485
us Set port 2 to RS232
vs Set port 2 to RS485
ws Set port 1 120-ohm termination off
ys Set port 1 120-ohm termination on
mm Set port 2 120-ohm termination off
nn Set port 2 120-ohm termination on
oo Turn on Half Duplex mode for both ports
pp Turn on Full Duplex mode for both ports
qq Turn off Fast Enable Mode, both ports
rr Turn on Fast Enable Mode, both ports
High Temperature Operation
The NVIDIA Jetson TX2i is rated from -40C to 85C and is built using a Thermal Transfer Plate (TTP) as
part of the housing for the six (6) ARM cores and a large number of GPU’s. The DuraCOR 312 is certified
for operation from -40C and up to 71C, external box temperature, but the higher temperatures can only
be achieved with some form of thermal management, most notably for the GPU section of the TX2i. The
typical method to accomplish this is ‘throttling’ the GPU clock rates. In addition, the ARM cores can also
be throttled. In testing, we have noticed that throttling was required at temperatures in excess of 55C and
was highly dependent on the GPU activity. CPU activity played a lesser role. When using only the six
ARM CPU’s and GPU are not enabled, test units were able to operate at 71C indefinitely. However GPU
activity is an expected function.
Our automatic test protocol (ATP) software developed for testing from -40 to 71C had GPU and CPU
throttling abilities built into the code. The C312 units were operated with a full load which meant all
external interfaces working simultaneously (USB ports, Ethernet, CAN-Bus, all serial ports, HDMI, etc.)
and also the CPU’s and GPU’s were running heavy software algorithms designed to make maximum use
of all CPU cores and all GPU cores at the same time. In this full-power test mode, at 71C, the system will
overhead quickly unless GPU throttling is implemented. When running at 71C, our GPU’s were
dynamically throttled between full speed clocking and 50% GPU clock frequency. During the test at 71C,
the 312 GPU’s were at 50% clock frequency most of the time.
GPU’s clocking can run at 4 speeds, Off, 25%, 50%, 75% and 100%.
CPU clocking can run at specific frequencies defined by nVidia.
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