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ATS Designers Guide 51

3.4.1 Control panel bus topology and wiring

The basic control panel bus implementation is the RS485 interface. The design

guidelines for the control panel bus are the same as the wiring– see 3.1.1 – and topology

guidelines – see section 3.1.3 – for the system bus. Drawing3-17 shows a basic control

panel network using the system bus interface and accessories.

To implement a single bus branch, the following components are necessary:

• Control panels with the ATS1801 interface;

• ATS1741 RS232-RS485 converters;

The table below (Table 3-22) shows how to select equipment necessary to connect the

control panels this way.

Table 3-22 Equipment necessary to connect a network of N<16 control panels.

Product Description Amt.

ATS1801 Computer, printer interface (two RS232 ports) N

ATS1741 RS485 / RS232 bus converter N+1

TITAN

ATS

Control Panel

ATS1801

RS232

ATS1741

RS232

ATS

Control Panel

ATS1801

ATS1741

RS232

RS485

Drawing 3-16 Basic control panel networking bus design.

The flexibility of querying the control panel by the TITAN software (the poling time, and

timeout is set by software) allows the design of more complex networks than those based

only on the RS485 interface. For more complex implementations, the connections

described in sections 3.3.2 and 3.3.3 can be used. The paragraphs contain information

about direct connections between the computer and the control panel, as well as

increasing the distance between them. The following paragraph shows an example of a

control panel network using the Ethernet network and other connection methods.

3.4.2 Examples of CP networks connected by various communications interfaces.

All control panels in the system are queried according to a programmed schedule, which

means a lack of response from any of the control panels will be stored in the system

event log. Depending on the system functions, and the security level expected from the

system, the control panel network can be implemented in various ways. The provided

example shows only one of the methods.

The network design assumes:

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