Ethernet Communications - Telemark Cryogenics 1200 Instruction Manual

2.9 Ethernet Communication.
Telemark Cryochillers are capable of being controlled and data logged via
an integral Ethernet port, this is accessible on the services panel diagram.
This can be achieved using a portable laptop or can be used via a Ethernet
hub to interrogate the unit as well as send command functions. TCP/IP
Software is supplied with the unit on a USB thumb drive.
Communicating computer will need to be connected to the RJ 45 connector
to the unit on the lower right side of the cabinet using a "crossed-patch"cable.
This is a cable which can be purchased or made but should meet CAT5/6
requirements.
Ethernet cable Tips
A straight-thru cable has identical ends.
A crossover cable has different ends.
A straight-thru is used as a patch cord in Ethernet connections.
A crossover is used to connect two Ethernet devices without a hub or
for connecting two hubs.
A crossover has one end with the Orange set of wires switched with
the Green set.
Odd numbered pins are always striped; even numbered pins are
always solid colored.
Looking at the RJ-45 with the clip facing away from you, Brown is
always on the right, and pin 1is on the left
No more than ½" of the Ethernet cable should be un-twisted,
otherwise it will be susceptible to cross-talk.
Do not deform, do not bend, do not stretch, and do not run parallel
with main power lines or noise inducing sources.
By looking at a T-568A UTP Ethernet straight-thru cable and an Ethernet
crossover cable with a T-568B end, we see that the TX (transmitter) pins are
connected to the corresponding RX (receiver) pins, plus to plus and minus
to minus. You can also see that both the blue and brown wire pairs on pins 4,
5, 7, and 8 are not used in either standard. What you may not realize is that,
these same pins 4, 5, 7, and 8 are not used or required in 100BASE-TX as
well. So why bother using these wires, well for one thing it's simply easier to
make a connection with all the wires grouped together. Otherwise you'll be
Telemark Cryogenics Microprocessor Based Cryochillers
Fig 14. Ethernet cable (crossed)
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Revision 1.0.7 October 2018