R&S ESR Series User Manual page 563

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R&S ESR
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Up to 15 instruments can be connected
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The total cable length is restricted to a maximum of 15 m or 2 m times the number
of devices, whichever is less; the cable lenth between two instruments should not
exceed 2 m.
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A wired "OR"-connection is used if several instruments are connected in parallel.
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Any connected IEC-bus cables should be terminated by an instrument or controller.
GPIB Interface Messages
Interface messages are transmitted to the instrument on the data lines, with the atten-
tion line (ATN) being active (LOW). They are used for communication between the con-
troller and the instrument and can only be sent by a computer which has the function of
a GPIB bus controller. GPIB interface messages can be further subdivided into:
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Universal commands: act on all instruments connected to the GPIB bus without
previous addressing
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Addressed commands: only act on instruments previously addressed as listeners
The following figure provides an overview of the available communication lines used by
the GPIB interface.
User Manual 1175.7068.02 ─ 12
Remote Control
Remote Control - Basics
560