Bird Technologies 4421 - Manual (Page 24)

Bird 4421 RF Power Meter
12
Interface Capabilities
Table 5-4 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 fac-
tory 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
below, the address is set to 6 (the off switches have values of 4 and 2).
Figure 8 IEEE Interface Default DIP Switch Settings
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.
Note: The primary address is used by the
controller to refer to specific devices on the bus.
When programming the controller, the address in
the program must be the same as the address set
on the interface module. Each device on the bus
must have a different primary address.