Gpib Interface Operation; Gpib Connection - Aktakom ABM-4082 User Manual

when a query command is received; DMM will send the query response information.
5. Once a query command is received, DMM will send the query response information immediately even
if the rest commands have not been finished. So if the command includes two queries, the controller
should read the query responses twice. One query is recommended to be included in a single
command.
6. A query response is sent out in ASCII codes with the preset terminal character.
7. Several query responses will be sent continuously with 1ms interval. The controller should be ready to
receive the responses; otherwise the response information will be lost.
8. The controller should receive the preset query response terminal character. Otherwise you will confuse
a terminal character with a returned character. At the same time the controller should receive the last
returned character before receiving a query response.
9. For some commands that will take a long time to execute, for example reset command, the controller
should keep waiting to avoid the next command being lost when DMM is executing the former
command.
Please refer to Chapter 8 for serial interface program examples.
5.3

GPIB interface operation

This section contains information about GPIB bus standard, connecting to and using the GPIB interface.
5.3.1

GPIB Connection

When configuring a GPIB system, the following restrictions must be adhered to.

The total length of cable in one bus system must be less than or equal to two meters times the
number of devices connected on the bus (the GPIB controller counts as one device) and the total
length of cable must not exceed 20 meters.

A maximum of 15 devices can be connected on one bus system.

There are no restrictions on how the cables are connected together. However, it is recommended
that no more than four piggyback connectors be stacked together on any one device. The resulting
structure could exert enough force on the connector mounting to damage it.
Figure 5-3 shows the GPIB interface on the rear panel of DMM.
To allow many parallel connections to one instrument, stack the connector. Two screws are located on each
connector to ensure that connections remain secure. Figure 5-4 shows a typical GPIB system
interconnection.
Figure 5-3 Rear Panel GPIB Interface
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