Aritech ATS4000 Servisní příručka stáhnout pdf (Strana 39)

ATS Designers Guide 39

ATS1743

. . . .

ATS1743

1500m

Galvanic

insulation

Drawing 3-7 Connecting two branches using two optical fibres via the ATS1743 interface.

A typical use of the fibre-optic modules, besides extending a single bus branch, is a

branched bus configuration. The main bus is laid out using an optical channel, and the

branches using the RS485 interface. This way, many branches can be designed that

should total less than 6km in length and not exceed 1500m for a single branch. The fibre-

optic bus length is dependant on the parameters of the fibre used.

ATS1743

. . . .

ATS1743

. . . .

ATS1743

. . . .

ATS1743

Drawing 3-8 Optical bus with RS485.branches

Basing the bus design on optical fibres creates a need for every device to have its own

power supply. This can be troublesome in a system with control panel driven access

control, because every RAS controlled door would need to have its own power supply

with battery back-up.

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Aritech ATS4000 Servisní příručka Strana 39