BIRD THRULINE 4021, Instruction Book

Page: 23 / 62

IEEE-488 GPIB Interface
13
Interface
Capabilities
The interface module’s capability function codes are listed in
Figure 10.
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.
Figure 10
IEEE-488
Interface Module
Capabilities
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.