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2620A, 2625A
Users Manual
4-12
Table 4-2. IEEE-488.1 Capabilities
Capability Description
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
Enabling the IEEE-488 Interface
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.
Table 4-3. IEEE-488 Setup
Baud Address
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.