4-10 Chapter 4: Electrical Connection 42/24-10 EN Rev. 9
System Bus Connection
System Bus The functional components of the gas analyzer, i.e. the electronics module, the
external I/O devices and the analyzer modules communicate with each other via
the system bus.
The system bus structure is linear with a maximum length of 350 meters.
One System Housing The system bus connection is established at the factory when the gas analyzer
functional components (e.g. an electronics module and an analyzer module) are
installed in one system housing.
In this case a terminating resistor should be installed in the system bus connector
(supplied with the unit, see Figure 4-8).
Figure 4-8
One System Housing:
Terminating Resistor
on the Electronics
Module
PSAM EM
BUS
AM Analyzer Module
EM Electronics Module
PS Power Supply
BUS System Bus (Internal)
Terminating Resistor
Multiple System
Housings
If the gas analyzer functional components are installed in several system housings,
they must be interconnected externally via the system bus (see Figure 4-9 and
instructions on the following page).
Figure 4-9
Multiple System
Housings:
Connection via the
System Bus
BUS
PSEMPSAM
AM Analyzer Module
EM Electronics Module
PS Power Supply
BUS System Bus (External)
Terminating
Resistors
CAUTION!
Only one electronics module should be connected to a system bus structure.
Multiple electronics modules should never be interconnected via the system
bus!
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