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Options 25

4. OPTIONS

4.1 THE RS232/422/485 INTERFACE OPTION

With this option installed, the circuits for both the RS232 and RS422/485 are

provided as standard. They can be used to interface to both printers and computers

and a number of standard protocols are built into the instrument.

4.1.1 Hardware

The following diagram provides an overview of the RS232/RS422/RS485

communications hardware. All three interfaces are available on the rear terminal

strips and the user can select either one by making the appropriate connections.

The RS232 interface is primarily used with printers or for simple communication

with a computer over a short distance. The RS422 and RS485 interfaces are used

for communication over a long distance or in applications requiring multipoint

communication.

(+)

(-)

(+)

(-)

RS422 Out

RS422 In

Data In

Data Out

Ground

RS232

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Yokogawa 414 Batch Controller Manuale Utente Pagina 27