Measurement-computing Serial488A Manual de usuario descargar pdf (Pagina 55)

4.6

DIO4 IEEE Input Buffer Full

When this bit is set, it indicates that the

Serial488A

may hold off

the controller on subsequent data transfers. The interface may

continue to accept an additional 512 characters but this is

dependent on the serial input buffer size.

DIO3 Received Last Serial Terminator

This bit is set [1] when the

Serial488A

detects the last serial

terminator at its serial input. It remains set as long as there is at

least one serial terminator in the serial input buffer. If the

Peripheral SRQ

feature is enabled, the

Serial488A

will issue a

request for service by asserting the

SRQ

line and also set the

rsv

bit [DIO7]. The

rsv

bit is cleared, along with the

SRQ

line, when

serial polled by the controller. If there are additional serial

terminators in the serial input buffer,

Serial488A

will reassert the

SRQ

line and

rsv

bit when the last IEEE 488 bus terminator is sent

to the IEEE 488 controller.

DIO2 Serial Handshake

This bit indicates the present state of the serial handshake. If it is

set to "1", the serial device connected to the

Serial488A

is capable

of accepting serial data. If "0", the RTS line is unasserted, if

configured for hardware handshake, or the "Xoff" character has

been received, if configured for Xon/Xoff software handshake.

DIO1 Not Used - Always "0"

4.5 Use of Serial and Bus Terminators

The

Serial488A

can be configured to provide RS-232 to IEEE 488 and IEEE

488 to RS-232 terminator substitution. This is useful when interfacing a serial device,

which only issues carriage return [CR] as an output terminator, to an IEEE controller,

which expects a carriage return followed by a line feed [CR-LF].

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