SDN System Description
1-2
words per 32-millisecond poll cycle. The SDN is a half-duplex network
using terminated shielded twisted pair cable(s). All data is transmitted
differentially and serially using block code modulation. A detailed
description of the SDN system theory of operation is given in a subsequent
section of this manual.
Within the connected instruments, SDN interface circuitry provides the
link between the serial digital network, and the instrument connected to
the SDN (except the ACC) has basically the same interface circuitry, most
of which is contained on a custom integrated circuit called the SDN
Interface Circuit Chip (SIC Chip). A detailed description of the SIC Chip
theory of operation is given in a subsequent section of this manual.
Figure 1-1. SDN Components
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