2.1 primary network, 2.2 sub networks, 2.1 primary network 4-2.2 sub networks – Innotech Device Network Cabling User Manual

Page 39

Advertising

Innotech Device Network Cabling Installation Instructions

Chapter 4 – General Specifications

Page 39

CAT6 STP (Shielded Twisted Pairs), where each pair is individually shielded, are suited for use with multiple

RS485 communications channels such as the Innotech Primary Comms network. Shielding is required because of

increased pair to pair capacitance, which is the primary culprit for Global/Net channel cross talk.

NOTE

4-2.1 Primary Network

Any cable that meets or exceeds all the stated specifications is suitable for use.

Primary Network Minimum Requirements:

• 2 twisted pairs

• Minimum conductor cross section AWG24 (0.205mm²)

• Stranded core type is recommended (7 strands of 0.193mm)

• Conductor resistance 80 Ohms / km or less

• Overall Foil screened cable with a wire drain

• Less than 50pf capacitance per metre between conductors

• Less than 80pf capacitance per metre between conductor and screen

• Impedance 100 – 120 Ohms

• Sheath thickness 0.8mm 240V rated

• Equivalent to the Belden Part #8102

4-2.2 Sub Networks

CAT6 FTP (Foil Screened Twisted Pair) cable is suitable for single RS485 communications channel

networks.

Any cable that meets all the stated specifications is suitable for use.

Sub System Network Minimum Requirements:

• 1 twisted pair