E6581402c

3.3. Network cable connection

Connect the BACnet network cable to communication option as follows.

Title

Description

Wire type

Shielded twisted cable

Characteristic impedance

Between 100 and 130 ohm

Distributed impedance between

Less than 100pF per meter

conductors

 

Distributed impedance between

Less than 200pF per meter

conductors and shield

Foil or braided shields are acceptable.

Length of an MSTP segment

1200 meters with AWG18 (0.8mm2)

Cable sheath should be peeled off by about 7mm.

For wiring work, use a flat blade screwdriver with a 0.6mm thick and 3.5mm width blade.

mmTightening torque for the terminal block is 0.5Nm.

*Fix a cable so that a communication connector may be not taken the weight of wire.

3.4.Network configuration

Make up the network as follows.

-Transmission/reception signals (A, B)

Make up the communication path by connecting all transmission/reception data cables.

-Signal common (GND) GND is the signal common.

-Grounding the shield of cable (SCR)

Connect the all shield lines of network cable. The shield shall be grounded at one end only prevent currents from being created.

-Termination resistor

A termination resistance of 120 ohms plus or minus 5% shall be connected at each of the two ends of the segment medium. This option has a termination resistor, so if use, set up the termination resistor SW. (Refer to 2.1 Outline)

At least one set, and no more than two sets, of network bias resistors shall exist for each segment. This option has local bias resistors.

 

B

 

B

 

 

B SW4

TERM

 

A

 

A

 

A

 

120

120

GND

 

GND

 

GND

 

 

 

 

Termination

Termination

SCR

 

SCR

 

SCR

 

 

 

+5

Communication

Communication

4.7k

4.7k

 

 

 

 

+5

 

510

510

cable

cable

 

 

 

 

 

 

47k

 

47k

 

 

 

 

 

 

 

 

 

 

 

 

 

Node with network

Node without

 

Node with local bias resistors

 

bias resistors

 

bias resistors

 

This option board

 

N.B.:Do not connect the SCR terminal to the power ground of inverters or other units.

Keep the network cables 20cm or more separate from the power cables to prevent from malfunctioning due to electromagnetic noise.

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Toshiba BCN002Z instruction manual Network cable connection, Network configuration
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