Table 4-1, Repeater requirements, 1 network specifications – Innotech Device Network Cabling User Manual

Page 38: 2 cable specifications, 1 network specifications 4-2 cable specifications

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© Mass Electronics Pty Ltd 2007

Innotech Device Network Cabling Installation Instructions

Edition 3.0 dated 05.12.2013

Page 38

4-1 Network Specifications

The network type and baud rate determine the maximum recommended cable specifications. For

cable runs longer than the recommended lengths an Innotech Repeater IR11 or IR12 should be used.

Repeaters may also be required if the number of devices connected to a network segment exceeds

the maximum allowable number of devices for the specific network.

Network

Type

Maximum

Number of

Devices

Maximum Number of

Devices Before a Repeater

is Required

Baud Rate

Maximum Cable

Length Before

Repeater is Required

Primary

Network

128

31

9600/4800

1000m

57600/38400

400m

Sub System

Network

63

31

115200

200m

REM

Network

15

N/A

38400

600m

Table 4-1: 

Repeater Requirements

4-2 Cable Specifications

Innotech recommends the use of cables specifically designed for RS485 networks. There are many

cables on the market that meet the specifications for RS485 networks.

Best reliability is achieved through a cable consisting of 2 individually shielded twisted pairs of low

capacitance. Such cables also provide excellent mechanical strength and lowest electrical resistance,

which is beneficial for maximum length cable runs.

Some CAT6 cable types may also be suitable in certain applications. Care should be taken when using

CAT6 for Primary Networks as they frequently omit shielding. CAT6 cables should be shielded in order

to provide reliable communications.

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