Fluke 2620A User Manual

Users Manual

4-12

SH1 and AH1

Read and write bus handshaking, including hold off.

T5

Basic talker with serial poll and without talk only mode. Serial poll is used to
return the instrument status byte to the controller.

TE0

No extended talker.

L4

Basic listener without listen only mode. Listen only mode is only useful for an
IEEE-488 device like a printer.

LE0

No extended listener.

SR1

Service request interface; allows SRQs (service requests). The SRQ function
allows the instrument to notify the controller when an operation is complete.

RL1

Remote local capability with local lock out. Usually the instrument front panel
will not be operational while the instrument is in use by the IEEE-488 interface.
Remote local capability enables the front panel. Local lock out disables the
front panel.

PP0

No parallel poll capability. Parallel poll is rarely used in the industry. It was
intended as a fast way to get a status bit from several devices, but failed in
gaining acceptance.

DC1

Device clear capability. This allows the instrument to be initialized to a known
state. The IEEE-488.2 standard describes exactly what this known state is.

C0

Not a controller.

E1

Open Collector Outputs

The IEEE-488 interface can be enabled only from the front panel, using the following
procedure. This procedure is also summarized in Table 4-3.

Press these
buttons:

COMM
(

K L

)

G

D

E

G

D

E

To select
from these
choices:

IEEE

300
600

1200
2400
4800
9600

0
1

•
•

30

1.

 

Select COMM (

K L).

 

The left display shows "IEEE" or an RS-232 baud rate, and "bAUd" appears in the
right display. Proceed with the following steps.

 

If "IEEE" is shown in the left display, the IEEE-488 interface is already enabled.