Measurement-computing Serial488A Instrukcja Użytkownika Pobierz pdf (Strona 20)

2.10

2.3.6 Serial Handshake Selection

Switch

SW1-5 is used to select between hardware [

RTS/CTS

] or

software [

Xon/Xoff

] serial handshake control.

With

Xon/Xoff

, the

Serial488A

issues an

Xoff

character [ASCII value

of $13] when its buffer memory is near full. When issued, there is greater

than 1000 character locations remaining to protect against buffer overrun.

When it is able to accept more information it issues an

Xon

character

[ASCII value of $11]. The

Serial488A

also accepts

Xon/Xoff

on transmit

from the serial host it is communicating with.

RTS/CTS

serial control

becomes inactive when

Xon/Xoff

is enabled. The

RTS

output is, however,

set to an active high state. The

CTS

input is not used for this handshake

and may be left floating (unconnected).

With

RTS/CTS

, the

Serial488A

un-asserts

RTS

(low) when its buffer

memory is near full. When un-asserted, there is greater than 1000 character

locations remaining to protect against buffer overrun. When it is able to

accept more information it asserts (high)

RTS

. The

Serial488A

will not

transmit data to the serial host if it detects the

CTS

input un-asserted (low)

when configured for this hardware handshake.

The factory default serial control is hardware,

RTS/CTS

SW1 View for Serial Handshake Selection

OPEN

12345678

DOT

Switch

Side

View

OPEN

12345678

RTS/CTS Xon/Xoff

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 84 85

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