IEEE-488 GPIB Interface
12
Interface Capabilities
Table 4
IEEE-488 Interface Module Capabilities
Indicators
The bottom line of the power meter’s display shows indicators describing the status of the Bird 4421 when used
with the IEEE interface. These are:
REMOTE —
When REMOTE is displayed, the power meter is being controlled through the interface.
Measurements, units of measure, and certain other parameters may be changed from a remote location.
LISTEN —
When LISTEN is displayed, the power meter is receiving data.
TALK —
When TALK is displayed, the power meter is transmitting data. This is always shown when the unit is in
“talker-only” mode.
LOCAL LOCKOUT —
When LOCAL LOCKOUT is displayed, the push buttons are disabled and the power meter’s
functions are being remotely controlled.
Setup
Dip Switch
Set the interface to ADDR (Addressable) by positioning DIP switch 1 to ON. This makes the 4421 respond to
controller commands.
Note:
There are several button styles on DIP switches (slide, rocker, lever). Examine the DIP switch to
determine the ON and OFF positions.
Set the primary address using the DIP switches. The primary address is factory set to 6, but can be set to any value
between 1 and 31 (0 is reserved for the controller) To set the primary address, turn OFF switches 4 – 8 so that the
sum of the bits turned off equals the desired primary address. In
Figure
8 on page
13
, the address is set to 6 (the
off switches have values of 4 and 2).
Code Name
Description
SH1
Source Handshake Can handshake data or command bytes when the unit is
acting as a source.
AH1
Acceptor
Can handshake the bus when it is acting as the acceptor of
data or commands.
T5
Talker
Can send data over the bus to other devices. This capability
exists only after the instrument has been addressed to talk,
or after a reading in talk-only mode.
L4
Listener
Can receive device-dependent data over the bus. This
capability exists only after the unit has been addressed to
listen.
SR1
Service Request
Can request service from the controller.
RL1
Remote-Local
Can be placed in remote or local mode.
PP0
Parallel Poll
Does not have parallel polling capability.
DC1
Device Clear
Can be reset to factory settings.
DT1
Device Trigger
Can have its readings triggered.
C0
Controller
Does not have controller capability.
E1
Bus Driver Type
Has open-collector bus drivers.
TE0
Extended Talker
Does not have extended talker capability.
LE0
Extended Listener
Does not have extended listener capability.
