Caple C806C Manual de Instruções descarregar pdf (Página 13)

PF2100

Modbus Card Instruction Manual v1.1

Jan 5, 2012

Page 9

System Considerations

When installing the Modbus Card, it is important to consider the entire system in order to ensure proper operation of all devices. The system consists of all

components that are on the same bus including the Master device, all Slave devices, the wiring, repeaters, and bus terminators. The following things should be

considered before designing a new RS-485 bus or when adding devices to an existing bus:

1. Cable Type

2. Duplex

3. Wiring Topology

4. Termination

5. Baud Rate

6. Number of Devices

7. Turn-Around Delay

8. Signal Naming Conventions

9. Ground

Cable Type

The RS-485 signaling standard is intended to be used with twisted pair cable (such as Cat-5e) for best performance in noisy environments or in installations with

long cable runs. Non-twisted pair cable may be acceptable for shorter cable runs but is generally not recommended. Ensure that you use 2 wires of the Cat-5e

cable that are from the same color coded pair for the signal wires plus one other for ground. Otherwise, you will not reap the noise immunity benefits of the

twisted pair cable.

Duplex

This card is intended to be used in a half-duplex configuration using a single twisted pair of wires. Full-duplex communication (using 4 wires organized in 2

twisted pairs plus one other wire for ground) may be possible but is not officially supported by this card or by the RS-485 standard.

Wiring Topology

For installations where there are multiple devices operating on the same bus, it is important to consider the wiring topology. RS-485 is intended to be wired up

as a single bus with short “drops” used to connect the individual devices to the bus. RS-485 should not be wired up in a star or ring configuration. A star wiring

topology can work if a repeater is used to prevent impedance mismatches.

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