Measurement-computing Serial488/4 Manuel d'utilisateur télécharger pdf (Page 47)

Section 3 Command Descriptions

3.8

Handshake Type Gn

The Handshake Type command determines the flow control method to be used in

serial data transfers for the selected serial port. The Port Select command (

) is used

to select the serial port regardless of addressing mode in use.

The hardware handshake method uses the

RTS

and

CTS

signals of the serial

interface to prevent data overruns by asserting the

RTS

line when the Serial488/4 is

able to accept data and requiring the

CTS

signal to be asserted before transmitting

data.

The software handshake method uses two special serial characters,

XON

(11 hex)

and

XOFF

(&H13) to control data flow . T he

XOFF

character is sent to stop data

transmission and the

XON

character is sent to resume data transmission. It should be

noted that the software method is not compatible w ith binary data as the data itself

may contain

XON

and

XOFF

characters.

If no handshaking is desired, handshaking may be disabled entirely. The factory

default setting as set by the Save Configuration command (

) is

, hardware

handshaking (

RTS/CTS

Hardware handshaking (

RTS/CTS

) is selected.

Software handshaking (

XON/XOFF

) is selected.

No handshaking is selected.

Return present handshaking method.

Example 1: Select software handshaking on port 1 using dual primary addressing

mode.

PRINT#1,"OUTPUT08;P1X" select port 1 as the current port

PRINT#1,"OUTPUT08;G1X"

select software handshaking

Example 2: Select hardware handshaking on port 2 using secondary addressing mode.

PRINT#1,"OUTPUT0800;P2G0X"

select hardware handshaking for port 2

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 90 91

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Measurement-computing Serial488/4 Manuel d'utilisateur Page 47

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