Measurement-computing Serial488A Manuel d'utilisateur télécharger pdf (Page 56)

4.7

In the previous example, the serial terminator should be selected for CR Only

with the IEEE terminator set to CR-LF. When a serial CR character is received it is

discarded and substituted with an IEEE CR followed by an IEEE LF. In the IEEE to

serial direction, the IEEE CR is unconditionally discarded. Upon receipt of the IEEE

LF, a serial CR is substituted.

The

Serial488A

can be made totally data transparent by setting both the serial

and IEEE terminators to be CR Only or LF Only. The choice of appropriate

terminators may be determined by inspection of the serial device and IEEE controller's

instruction manuals. For selection of the

Serial488A

's serial and bus terminators you

should refer to

Section 2

of this manual.

4.6 IEEE 488 Bus Implementation

The

Serial488A

implements many of the capabilities defined by the IEEE 488

1978 specification. These are discussed in the following sections. The bus uniline and

multiline commands that the

Serial488A

does not support or respond to include:

Remote Enable

(REN)

Go to Local

(GTL)

Group Execute Trigger

(GET)

Local Lockout

(LLO)

Take Control

(TCT)

Parallel Poll

(PP)

Parallel Poll Configure

(PPC)

Parallel Poll Unconfigure

(PPU)

Parallel Poll Disable

(PPD)

4.6.1 My Talk Address

(MTA)

When the

Serial488A

is addressed to talk, it retrieves data from the

serial input buffer and outputs it to the IEEE 488 bus. It substitutes the

selected IEEE bus terminators for the received serial terminators. The

Serial488A

will continue to output serial input buffer data as long as the

IEEE controller allows.

4.6.2 My Listen Address

(MLA)

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 84 85

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Measurement-computing Serial488A Manuel d'utilisateur Page 56

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