Specifications

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part nr. 3220 (power supply, null modem cable, cross connected Ethernet cable).
• Serial cable for console port
When connecting a computer to Arctic’s console port, a cross-connected (null modem
cable) is used.
• Serial cable for RS1 application port (Gateways)
The RS1 application port is always RS-232 and switchable between console and
application (plain data) port. Power off Arctic before changing the switch state.
• Serial cable for RS2 application port (Gateways)
The RS2 port is configurable between RS-232 and RS-422/485. Full and half duplex are
supported. Power off Arctic before changing the DIP switches’ states.
• Antenna cable (optional)
If the Arctic is located inside a cabinet, the signal level of cellular network may not be
sufficient for operation when using the standard antenna. An external antenna with a cable
equipped with FME connector may be used. The recommendation is to use an
omnidirectional antenna, which has even gain in every direction. Antennas having 3 to 9
dBi gain (or even more) are recommended, higher gain is usually better.
11.2.2. Arctic’s Ethernet specifications:
• 10 Base-T or 100 Base-T
• Supports auto negotiation
• Supports half duplex and full duplex
• Shielded Ethernet connection, shield connected to power supply ground
Note: When using shielded cable, consider the possible voltage potential differences.
Commonly, the unshielded twisted pair (UTP) cable is the best solution.
11.2.3. Grounding
In order to avoid device failures due to ground loops or due to other grounding problems, it is
essential to verify that proper actions are taken regarding the grounding of the equipment.
The grounding of the equipment depends on the use case and also on the national electrical and
safety regulations. Some best practices for grounding of the equipment are as below:
• Consider whether the Shielded Twisted pair Ethernet cable (STP) is needed at all, if
not, use unshielded cable (UTP) to avoid ground loops.
• Use one common grounding point.
• For grounding the serial devices, see page 64, chapter 15.7: Grounding.