Measurement-computing Micro 488/EX rev.2.1 Instrukcja Użytkownika Pobierz pdf (Strona 21)

Section 2 Getting Started

2.7

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 Micro488/EX issues an

XOFF

character [ASCII

value of

&H13

] when its buffer memory is near full. When issued, there are

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

&H11

]. With this handshake, the Micro488/EX

issues an

XON

character at reset or power-on. The Micro488/EX also

accepts

XON/XOFF

on transmit from the serial host it is communicating

with.

RTS/CTS

serial control becomes inactive when

XON/XOFF

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 Micro488/EX un-asserts

RTS

(low) when its

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

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

able to accept more information it asserts (high)

RTS

. The Micro488/EX

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 ... 16 17 18 19 20 21 22 23 24 25 26 ... 217 218

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