Network Cable Connection; Network Configuration - Toshiba BCN002Z Instruction Manual

3.3. Network cable connection

Connect the BACnet network cable to communication option as follows.
Characteristic impedance
Distributed impedance between
Distributed impedance between
Length of an MSTP segment
* 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
A
120 GND
Termination SCR
510
Node with network
bias resistors
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.
Title
Wire type
conductors
conductors and shield
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.
Tightening torque for the terminal block is 0.5Nm.
mm
GND
SCR
+5
Communication
cable
510
Node without
bias resistors
Description
Shielded twisted cable
Between 100 and 130 ohm
Less than 100pF per meter
Less than 200pF per meter
Foil or braided shields are acceptable.
1200 meters with AWG18 (0.8mm
B
A
Communication
cable
- 10 -
E6581402
2
)
TERM
B SW4
A
GND
Termination
SCR
4.7k
4.7k
+5
47k
47k
Node with local bias resistors
This option board
120