Agilent Technologies J-BERT N4903B Instrukcja Obsługi Pobierz pdf (Strona 28)

100

101

Status Byte

The Status Byte is the summary register to which the other registers report. Each

reporting register is assigned a bit in the Status Byte Register.

The bits in the Status Byte byte have the following meaning:

Table 1

Bit Mnemonic Description

0 Not used

1 Not used

2 EAV Error available: The error

queue contains at least

one message.

3 QUES A bit has been set in the

Questionable Data Status

signal is of questionable

quality).

4 MAV Message available: There

is at least one message in

the message queue.

5 ESB A bit in the Standard Event

6 SRQ or MSS Value depends on the

polling method; see below

for details.

7 OPER A bit in the Operation

Status Register has been

set.

Bit 6 has two definitions, depending on how the access is polled:

• Serial Poll

If the value of the register is read using the serial poll (SPOLL), bit 6 is referred

to as the Service Request (SRQ) Bit. It is used to interrupt and inform the active

controller that the instrument has set the service request control line, SRQ.

3 Recommended Programming Techniques

28 Agilent J-BERT N4903B High-Performance Serial BERT

Bit 6

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 405 406

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