User`s manual

Introduction

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1.6 CYMOD RS-485 Network Configurations

CYMOD 400 Series is designed under RS-485 multi -drop network

architecture. Up to 256 CYMOD modules can be controlled in a multi -drop

network. The limit of 256 is due to command code. The network can be

connected by simple topology (Figure 1-1) or branch topology (Figure 1-2) or

free topology (Figure 1-3).

The CM 4520 and CM 4510 are the two basic communication modules to

construct a RS-485 network. The CM 4520 is a RS-232 to RS-485/RS-422

converter. The CM 4520 is used to build a RS-485 port for the host computer by

converting standard RS-232 signal into RS-485 signal.

The CM 4510 is the RS-485 signal repeater which is used to extend or to

lengthen the network distance. A CYMOD bus can connect up to 256 modules,

each segment is up to 128 modules. Whenever the numbers of the modules

excess 128, the repeater should be used. In addition, the length of a standard

RS-485 bus is up to 4000 feet, the repeater should be used whenever the

length of a signal bus is more than 4000 feet.

The CM 4530 is the USB to RS-485/RS-422/RS-232 converter, and it used to

build the USB signal into RS-485/RS-422/RS-232 signal.

The CM 4524 is an addressable RS-485/RS-422 to RS-232 converter, it allows

the RS-232 devices to easily link to the Host by the RS-485/422 bus.

Figure 1-1 Simple Topology

Host

RS-232/RS-485

CYMOD Modules

RS-232

RS-485 bus

CM 4520: RS -232 to

RS-485/RS-422

Converter

CM 4530 USB to

RS-232/RS485/RS-422

Converter.

Terminator

CM 4524