Siemens FIDAMAT 6 Operating Instructions Manual page 40

Installation instructions
3.4.3.3 ELAN interface line
Bus termination
resistors
Fig. 3-4: Pin assignments
3-10
Specifications of the interface cable
Characteristic 100 to 300 Ω
impedance
> 100 kHz
Cable
Typically < 60 pF per meter
capacitance
Core
>0.22 mm
cross-section
Cable type twisted pair, 1 x 2 conductors
Signal attenuation max. 9 dB over entire length of line section
Shielding Copper braiding, or braided shield and foil shield
Before bus termination resistors can be connected, in the first and last
connectors of a bus cable pin 3 has to be jumpered with pin 7, and pin 8
with pin 9 (see Fig. 3-4 "Pin assignments").
Note
If the bus cable is longer than 500 m or there is a high level of
interference it is advisable to install a repeater. For further information see
function 73 in "ELAN configuration" on page 5-33 or in the description of
the ELAN interface.
Order number: C79000-B5200-C176 German
C79000-B5276-C176 English
at a measuring frequency of
2
, corresponds to AWG 23
FIDAMAT 6 gas analyzer
Operating manual –A5E00222135-01