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App index – Yokogawa Button Operated MV2000 User Manual

Page 61

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3-3

M-4662

Using

the
Serial

Interface

1

2

3

4

5

6

7

App

Index

• Connection example

SD

RD

RS

CS

SG

SD

RD

RS

SG

• OFF-OFF/XON-XON

PC

MV

SD

RD

RS

CS

SG

SD

RD

RS

SG

• XON-RS (XON-RTS)

PC

MV

SD

RD

RS

CS

SG

SD

RD

RS

SG

• CS-RS (CTS-RTS)

PC

MV

CS

CS

CS

2

3

8

7

5

2

3

8

7

5

2

3

8

7

5

You do not need to wire RS on the PC to

CS on the MV. However, we recommend it

so that the cable can be used in either

direction.

Handshaking

When using the RS-232 interface for transferring data, it is necessary for equipment on
both sides to agree on a set of rules to ensure the proper transfer of data. The set of
rules is called handshaking. Because there are various handshaking methods that can
be used between the MV and the PC, you must make sure to choose the same method
for both the MV and the PC.
You can choose any of the four methods in the table below for the MV.

Data transmission control

(Control used to send data to a computer)

Data Reception Control

(Control used to receive data from a computer)

Software

handshaking

Software

handshaking

Handshaking Combinations (Yes indicates that it is supported)

OFF-OFF
XON-XON
XON-RS
CS-RS

Handshaking

Stops sending

when X-OFF is

received. Resumes

when X-ON is

received.

Stops sending

when CS (CTS)

is false.

Resumes

when it is true.

No

handshaking

No

handshaking

Sends X-OFF

when the receive

data buffer is 3/4

full. Sends X-ON

when the receive

data buffer is

1/4 full.

Sets RS (RTS) to

false when the

receive data buffer

is 3/4 full. Sets RS

(RTS) to true when

the receive data buffer

is 1/4 full.

Hardware

handshaking

Hardware

handshaking

Yes
Yes

Yes

Yes

Yes

Yes

Yes

Yes

• OFF-OFF

• Data transmission control
There is no handshaking between the MV and the PC. The MV treats the “X-OFF”

and “X-ON” signals that are received from the PC as data and ignores the CS
signal.

• Data reception control
There is no handshaking between the MV and the PC. When the received buffer

becomes full, the MV discards all of the data that overflows.

RS = True (fixed).

3.2 Connecting the MV

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