Agilent Technologies Agilent 8166A Instrukcja Obsługi Pobierz pdf (Strona 20)

Introduction to Programming Message Queues

20 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition

How the Input Queue Works

The input queue is a FIFO queue (first-in first-out). Incoming bytes are

stored in the input queue as follows:

1 Receiving a byte:

• Clears the output queue.

• Clears Bit 7 (MSB).

2 No modification is made inside strings or binary blocks. Outside strings

and binary blocks, the following modifications are made:

• Lower-case characters are converted to upper-case.

• The characters 00

to 09

and 0B

to 1F

are converted to spaces

(20

• Two or more blanks are truncated to one.

3 An EOI (End Or Identify) sent with any character is put into the input

queue as the character followed by a line feed (LF, 0A

). If EOI is sent

with a LF, only one LF is put into the input queue.

4 The parser starts if the LF character is received or if the input queue is

full.

Clearing the Input Queue

Switching the power off, or sending a Device Interface Clear signal, causes

commands that are in the input queue, but have not been executed to be

lost.

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Agilent Technologies Agilent 8166A Instrukcja Obsługi Strona 20