BIRD THRULINE 4020 series, Instruction Book

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IEEE-488 GPIB Interface
15
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,
sum of the bits turned off equals the desir ed pr im a r y a ddr ess. In F igu r e 12
below, the address is set to 6 (the off switches have values of 4 and 2).
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 pro-
gram must be the same as the address set on the interface module. Each
device on the bus must have a different primary address.
Talker-Only Mode
The Bird 4421 can be set up for manual operation while automatically sending
data to an output device (Talker-Only Mode). To do so, turn DIP switch 1 OFF
and cycle the power. TALK will be displayed.
In Talker-Only mode, pressing a button on the meter triggers a measurement.
When the measurement is complete, the information is sent to the bus and
LISTEN turns on momentarily. A listen-only device on the bus, such as a
printer, can read the value. The power meter is then ready to accept another
button press.
Command Syntax
The Bird 4421 accepts two types of commands. General bus commands are
commands, such as Device Clear (DCL), that apply to any IEEE interfaced
device. Device-dependent commands are specific to the 4421.
Figure 12
IEEE Interface Default
DIP Switch Settings