System Communications Controller; Sdn Interface Card; Branch Cables - Philips M3150B Installation And Service Manual

Information center system
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System
The System Communications Controller (SCC) is the active device of the SDN. Its
Communicatio
functions are to provide the communication link among instruments connected to the SDN,
ns Controller
establish SDN polling cycles, and control data flow, timing, synchronization, and distribution
throughout the system.The SCC is shown in Figure 2-36.
The SCC performs basic SDN fault detection to insure reliability of SDN system
communication as well as self-diagnostic routines for SCC fault detection, troubleshooting,
and servicing.
Warning
For the Information Center system to comply with IEC 60601-1-1, a second Protective
Earth (PE) must be provided for the SDN. This is normally accomplished by providing a
second PE to the SCC. This is described in Chapter 4, Safety.
Note
The Information Center can also monitor up to two telemetry mainframes without the need for
an SCC. In this application, the telemetry mainframe output is connected directly to the
Information Center's SDN Interface Card input. Priority wire connections are required for this
application. See Figure 2-37.
SDN Interface
The SDN Interface Card is the intelligent interface between the SDN and the PC host. It
Card
receives and sends messages to and from other instruments over the SDN. A block diagram of
SDN Interface Card circuitry is shown in Figure 2-37.

Branch Cables

SDN branch cables are installed to connect the SCC to wall boxes where SDN instruments are
connected. Branch cables can be of two general types -- shielded, Serial Distribution Cables
2-36
Hardware Description
Figure 2-36 Serial Communications Controller
Branch
Cable
SDN Interface Card Circuitry
SDN
Transceiver
Serial
Circuitry
Bus
Figure 2-37 SDN Interface Card Block Diagram
PC
SIC
µ
P
Chip
Interface
PC Host
PCI Bus

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M3170M3155bM3151bIntellivue seriesM3169aM3154b

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