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34 ATS Designers Guide

as DGP number 16. The device number – its address – is set in each device attached to

the bus by a DIP switch or through software. There are no limitations as to the sequence

of addresses of the connected devices. The control panel queries each ATS system

component connected to the system data bus. Lack of response to the polling signals

sent triggers the tamper alarm with appropriate consequences. Therefore providing

reliable communications between the control panel and peripheral equipment is very

important to proper system function.

RAS 1-16

DGP 1-15

ATS Control

Panel

(DGP 16)

System Bus

Drawing 3-2 Basic construction of the Advisor MASTER system bus.

The system bus communications are implemented using the RS485 interface – a serial

data port with balanced and symmetric connection – one of the most interference

resistant systems used in electronics.

Table 3-1 Characteristic parameters of the system bus

Parameter Value

Interface RS485

Transmission mode Half Duplex

Bandwidth (bps) 4800

Range (m) 1500

Loop resistance (Ohm) 235

The provided bandwidth is adequate due to the system of distributed processing

implemented. Each system expansion has it’s own processor, and all necessary data

processing equipment for analyzing the system inputs. The RS485 interface range –

1500m – is guaranteed under optimal working conditions: with proper line fitting, and

appropriate wiring.

Line fitting is done using resistors placed at the start and end of the transmission line.

This operation secures a typical value for system bus resistance is 235Ohm. All ATS

system devices, except the ATS1190/92 Smart card readers, and hands free sensors

expansion ATS1230, working with the system bus have inbuilt terminating resistors,

activated via a jumper or DIP switch. Regardless of the circumstances the resistors can

only be activated in the two most distant, opposite ends of the network.

3.1.1 Wiring

For proper data transmission only three wires are necessary, a twisted pair for D+ and D-

signals, and power supply 0V for reference – Drawing 3-3. Nevertheless, to achieve the

maximum data transfer range, care about the proper technical parameters of the wires

must be taken.

Suggested cables: The suggested cables for the ATS system bus– RS485, 4800bps –

are:

• Belden 8723

• Aritech WCAT52

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Aritech ATS4000 Manuel de service Page 34

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