Specifications

Analyzer Internal Communications
The primary internal communication link within the Maxum II Modular
Oven analyzer is the I
2
C bus. This bus is used to provide the
communication paths from the CIM to the internal devices including
DPMs, EPCs, PECM-DC and I/O boards. Note that the SVCM
communications are via the PECM-DC.
Description
I
2
C Internal Bus
Physical Connections
The Advance Communication System (ACS) Ethernet is accessed via
the 10BaseT port on the CAC3 board. Internal boards are accessed via
I
2
C bus cables. I
2
C Bus A from the CIM-Base board connects to an I
2
C
connector on the PECM-DC board. The PECM-DC acts as a bus
distribution board with other I
2
C connectors on the PECM-DC being used
to connect to other devices. There are a total of 6 I
2
C connectors on the
PECM-DC board (1 for connection to the CIM and 5 for distribution to
other devices). Three of the connectors on the left of the PECM-DC and
three are on the right.
Note that a single daisy chain cable is used to connect from the PECM-
DC to the I/O boards, and another is used to connect from the PECM-DC
to the EPCs.
Figure 1-6: I
2
C Internal
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