TDK-Lambda Genesys Series, Руководство пользователя

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2.9.8.1) indicating the address of a supply that sent an SRQ .
1.5 USING DIGITAL PROGRAMMING
1.5.1 THE IEEE-488.2 INTERFACE
The IEEE-488 digital programming interface (also called the GPIB interface) is a popu-
lar way to connect instruments to a computer. It uses a specialized 24-pin cable with
connectors that allow cables to be ‘stacked’ together. There are eight data wires; eight
control wires and eight ground wires. If the system runs from a personal computer, there
are numerous vendors of IEEE controller cards and software.
The IEEE-488 standard has gone through several upgrades. The IEEE-488.1 focused
on the handshaking of the eight control lines. The IEEE-488.2 added status registers
inside each instrument and it added common commands to make programming groups
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syntax so one vendor’s power supply will use the same commands as another’s. The
Interface follows all of these standards.
Because many instruments may be connected and independently controlled by a single
IEEE controller, each instrument must have a unique address. The IEEE controller auto-
matically sets its address equal to the power supply address.
1.6 POINT-TO-POINT MODE vs MULTI DROP MODE
Upon application of AC power to the Power Supply, the PS IEEE Interface will query the
Power Supply to test if the Multi Drop installed. If the Multi Drop Option is installed, the
IEEE Interface will activate the Multi-Drop mode (regardless of the number of units con-
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is shown in Figure 1. . If the Multi Drop Option is not installed, the IEEE Interface will
activate the Point-to-Point mode.
When more than one Power Supply is connected to a single Power Supply with IEEE
Interface (in Multi-Drop mode), all of the Power Supplies must have the Multi Drop Option
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