Keyence Visual KV Series Manual de usuario descargar pdf (Pagina 332)

7.2 Serial Communication

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Chapter 7 Serial Communication

7.2 Serial Communication

When the KV is connected to a personal computer, the current value or preset value

of timers/counters or contents of data memories in the KV can be loaded to and

modified on the computer.

7.2.1 Command Transmission Procedure

Commands are transmitted from a personal computer to the KV base unit as follows:

■ Transmitting a break signal

A break signal is used to initialize the communication buffer and baud rate setting of

the KV. It is necessary to transmit a break signal of 100 ms or longer to the KV

before starting communication. Another break signal is unnecessary once the

communication is established.

A break signal must have the waveform shown below.

Note 1: For the first serial communication with a personal computer after the KV-

P3E(01) handheld programmer is connected to the KV, or after the "KV IncrediWare

(DOS)" or "LADDER BUILDER for KV" programming support software is evoked, be

sure to transmit a break signal. A break signal is unnecessary at other times.

Note 2: If you cannot transmit a break signal, turn OFF the KV once to initialize the

communication program. After that, restart communication between the KV and the

personal computer.

Note 3: Be sure to stop the communication for 10 ms or longer after transmitting a

break signal.

10 ms or longer

Transmits a command

Transmits communications

start command (CR)

Initialize the communication buffer and

baud rate setting of the KV.

Start communications with the KV.

Transmit a command which instructs the

KV to perform the required operation.

Transmits communications

end command (CQ)

End communications with the KV.

▲

Receive and check the response to the

transmitted command.

Transmits a break signal

Receiving a response

▲

100 ms or longer

-V

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Keyence Visual KV Series Manual de usuario Pagina 332

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