Measurement-computing Serial488/4 Bedienungsanleitung PDF herunterladen (Seite 30)

Section 1 Introduction

2.18

4096 memory locations are available in its internal buffers. If

available memory drops below 4096 bytes, the Serial488/4 un-

asserts (low) the

RTS+

signal. With

RTS/CTS

handshaking

selected, the

RTS+

signal may also asserted and un-asserted under

program control by using the (

) and (

) handshake control

commands respectively.

XON/XOFF

handshaking (

) is selected, the

RTS+

line

may either be programmed as either permanently asserted (high)

or to output sixteen times the baud rate clock. These options are

selected using the handshake control command (

If No handshaking (

) is selected, the

RTS+

line may either be

programmed as either permanently asserted (high), permanently

un-asserted (low), or to output a signal sixteen times the baud rate

clock. These options are selected using the handshake control

command (

RTS Request To Send (output) / 16 x Baud Clock (output)

The

RTS-

output is used as a hardw are handshake line w ith RS-

422 devices The pin functions identically to

RTS+

except that its

polarity is inverted. This signal is low true.

GND Ground

This signal sets the ground reference point for the other RS-232

input and output signals.

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