Fluke 5730A User Manual

5730A
Operators Manual
6-8
Interface Messages (IEEE-488 Only)
Interface messages manage traffic on the bus. Device addressing and clearing, data
handshaking, and commands to place status bytes on the bus are all directed by interface
messages. Some of the interface messages occur as state transitions of dedicated control
lines. The rest of the interface messages are sent over the data lines with the ATN signal
true. All device-dependent and common commands are sent over the data lines with the
ATN signal false.
IEEE-488 standards define interface messages. Table 6-2 lists the interface messages that
the 5730A Calibrator accepts. Table 6-3 lists the interface messages that the 5730A
Calibrator sends. The mnemonics listed in the tables are not sent as literal statements as
commands are. In this way they are different from device-dependent and common
commands.
Interface messages are handled automatically in most cases. For example, handshake
messages DAV, DAC, and RFD automatically occur under the direction of an instrument
interface itself as each byte is sent over the bus.
Table 6-2. Interface Messages Accepted by the Calibrator
Mnemonic Name Function
ATN Attention
A control line used to notify all instruments on the bus that the next
data bytes are an interface message. If ATN is low, these data
bytes are interpreted as device-dependent or common commands,
addressed to a specific instrument.
DAC
Data
Accepted
Sets the handshake signal line NDAC low.
DAV Data Valid Asserts the handshake signal line DAV.
DCL Device Clear Clears the input/output buffers.
END End
A message that appears when the controller asserts the EOI signal
line before sending a byte.
GTL Go To Local
Transfers control of the Calibrator from one of the remote states to
one of the local states (See Table 6-8.)
LLO
Local
Lockout
Transfers remote/local control of the Calibrator. (See Table 6-8.)
IFC
Interface
Clear
A control line that sets the interface to a quiescent state.
MLA
My Listen
Address
Addresses a specific device on the bus as a listener. The controller
sends MLA automatically whenever it directs a device-dependent or
common query to a specific instrument.

Fluke 5730A Specifications

General

Type	Multifunction Calibrator
Resistance Range	0 to 1 GΩ
AC Voltage Frequency	10 Hz to 1 MHz
Display	Color LCD
Interfaces	RS-232, Ethernet
Weight	18 kg
DC Voltage Range	0 to ±1100 V
Dimensions	172 mm H x 432 mm W x 457 mm D (6.8 in H x 17 in W x 18 in D)