DLS DLS 400A, Operating Manual

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REMOTE CONTROL
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These represent the minimum required to implement the IEEE 488.2 standard. Note that
the IEEE 488 interface is also known as the GPIB or HP–IB interface.
7.1.1 DLS 400 IEEE 488 Address.
The DLS 400 can use any valid IEEE 488 address (from 0 to 30). You can change the
address by using the DIP switch on the back of the unit.
The following figure shows the default switch setting (address 14):
7.1.2 The Service Request (SRQ) Line
The SRQ line, as defined by the IEEE 488.1 standard, is raised when the DLS 400 is
requesting service. Here are some examples of services that could raise SRQ:
• a message is available in the output buffer
• an error occurred
• all pending operations are completed
• the power was just turned on
In order to use the SRQ line, all relevant enable bits must be set. For example:
• the SRQ line can be raised automatically when there is a message available
by enabling the MAV bit (bit 4) in the Status Byte Register with the com-
mand *SRE 16;
AD5, weighting 16
AD4, weighting 8
AD3, weighting 4
AD2, weighting 2
AD1, weighting 1
5 4 3 2 1
1
0