Bus systems

6.1

Bus overview

 

 

 

 

 

 

 

 

 

 

 

 

 

Features

 

C-Bus

I-Bus

SynoLOOP

SynoLINE600

LON-Bus

Data Bus

Field of applica-

 

 

 

 

Local data bus

Local data bus

tion

 

 

 

For addressable

For collective

parallel ind.

 

Local system bus

Inside control unit

for floor indicator

 

 

detectors

detectors

panel, synoptic

 

 

 

 

panels

 

 

 

 

 

 

panel or relay

 

 

 

 

 

 

 

Speed of trans-

57kBaud

1000kBaud

2 messages/sec

(Direct current

78kBaud

SPI-Bus 2KHz

mission

 

signal)

 

 

 

 

 

 

Length of line

Max. 1000m

Max. 3m (only

 

Max.

Max. 500m as

 

 

 

Max. 150Ω/300nF

free topology

Max. 1000m

 

 

150/250Ω/4∝F

 

 

(G51 ∅ 0,8: 1400m)

inside cabinet)

See chapter 16

Max. 1000m as

 

 

See chapter 16

 

 

 

 

 

 

stub line

 

 

 

 

 

 

 

 

Number of users

… 16

… 16

… 128

1 address

… 32

… 24

connected or

(Max. 25 detec-

LON-Bus de-

C-Bus devices

I-Bus modules

D-Bus devices

Max. 8 addresses

addresses

 

tors)

vices

 

 

 

 

 

Number of wires

2

26

2

2

2

6

 

 

(+3 wires for emer-

 

 

(+3 wires supply)

 

 

gency operation)

 

 

 

 

 

 

 

 

 

 

 

Type of cable

Twisted 1)

Flat cable

Twisted

Twisted

Twisted

Twisted

 

 

(Un-twisted per-

(Un-twisted

 

 

 

 

missible)

permissible)

 

 

Loop line

 

✔

–

✔

–

–

–

T-branch

 

–

–

–

–

✔

–

 

 

(See chapter 18)

 

 

 

 

 

 

 

Short-circuit proof

Yes

 

Yes

 

 

 

 

 

Each user con-

–

Each user con-

No

No

Yes

 

 

nected with line

nected with line

 

 

 

 

 

 

 

 

separator

 

separator

 

 

 

Network structure

Master/master

Master/slave

Master/slave

Master/slave

Master/slave

Master/slave

Scanning

 

Event-controlled,

Cyclic,

Cyclic

 

Event-controlled,

 

 

 

- typ. all 64s

–

presence moni-

Cyclic

 

 

presence monitoring

Event controlled

- Interrupt on

toring

- typ. all 250ms

 

 

 

 

 

 

 

alarm

 

(All 60s)

 

Principle

 

Serial Bus

 

Sensor/actor-Bus

Conventional

Network

 

 

 

C-Bus

- Cerberus proto-

 

 

 

- Echelon Chip

Serial bus

 

 

- Cerberus protocol

col 'K31'

- Current gain

 

 

- Cerberus protocol

(LON protocol)

- Cerberus proto-

 

 

- Collision detection

- Serial 8bit

principle

 

 

- Manchester coding

- SPI/Motorola

- Start-up: daisy-

- Voltage levels

- Cerberus

col

 

 

 

 

chain

 

specific telegram

 

 

 

 

 

 

 

 

1Calibrated according to cable impedance: 50Ω (MICC) / 110Ω (G51, ø 0.8mm, not shielded)

6.2Modifying the impedance of the various C-Bus cables

C-Bus standard cables have a characteristic impedance of 110Ω. The driver and end-of-line resistors are soldered to solder lugs and can be adapted accordingly with other characteristic impedances (see diagram chapter 6.2.1).

1.Explanation

A cable must be terminated with resistors. The resistance value must correspond to the impedance of the cable. Each C-Bus user has four end-of-line resistors (Ri). In addition two driver resistors (Rd) are integrated on the p.c.b. In order that the resistors can be exchanged easily they are all soldered to solder lugs.

C-Bus p.c.b.

Ri

Rd

B3Q700

R31 ... R34

R49, R50

E3H020

R173, R174, R177, R178

R180, R183

The driver resistors specify the current on the C-Bus. In order that the signal on the

C-Bus always has the same amplitude (1.35Vpp), the following correlation is valid:

Rd = Ri x 3,65 (45Ω < Ri < 200Ω)

 

15

 

 

Siemens Building Technologies

007836_a_en_--.doc

Fire & Security Products

03.2004

Page 14 Page 16
Page 15
Image 15
Siemens FC700A manual Bus overview, Modifying the impedance of the various C-Bus cables, Rd = Ri x 3,65 45Ω Ri 200Ω
Page 14 Page 16

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