GDM-8246 MULTIMETER
PROGRAMMER MANUAL
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2
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2. CONNECTING THE DIGITAL MULTIMETER VIA
GPIB INTERFACE
The GPIB interface capabilities:
The GPIB interface of the Digital Multimeter corresponds to the
standard of IEEE488.1-1987, IEEE488.2-1992 and SCPI-1994. The
GPIB interface functions are listed as follows:
SH1(Source
Handshake)
: The DMM can transmit multilane
messages across the GPIB.
AH1(Acceptor Handshake) : The DMM can receive multilane
messages across the GPIB.
T6(Talker)
: Talker interface function includes basic
talker, serial poll, and unaddress if MLA
capabilities, without talk only mode
function.
L4 (Listener)
: The DMM becomes a listener when the
controller sends its listen address with
the ATN (attention) line asserted. The
DMM does not have listen only
capability.
SR1 (Service Request)
: The DMM asserts the SRQ (Service
request) line to notify the controller
when it requires service.
RL1 (Remote/Local)
: The DMM responds to both the GTL(Go
to Local) and LLO(Local Lock Out)
interface messages.
PP0 (Parallel Poll)
: The DMM has no Parallel Poll interface
function.
DC1 (Device Clear)
: The DMM has Device clear capability to
return the device to power on status.
DT0
(Device
Trigger)
: The DMM has no Device Trigger
interface function.
C0 (Controller)
: The DMM can not control other devices.
GDM-8246 MULTIMETER
PROGRAMMER MANUAL
⎯
3
⎯
Notes for GPIB installation
When the Digital Multimeter is set up with a GPIB system, please check
the following things:
z
Only a maximum of 15 devices can be connected to a single GPIB
bus.
z
Do not use more than 20m of cable to connect devices to a bus.
z
Connect one device for every 2m of cable used.
z
Each device on the bus needs a unique device address. No two
devices can share the same device address.
z
Turn on at least two-thirds of the devices on the GPIB system while
using the system.
z
Do not use loop or parallel structure for the topology of GPIB
system.
Computer’s Connection
A personal computer with a GPIB card is the essential facilities in order
to operate the Digital Multimeter via GPIB interface.
The connections between DMM and computer are following:
I.
Connect one end of a GPIB cable to the computer.
II.
Connect the other end of the GPIB cable to the GPIB port on
the Digital Multimeter.
III.
Turn on the Digital Multimeter.
IV.
Turn on the computer.
