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Siemens Building Technologies
Cerberus Division
5.3.4
Assessment of lower quality cable
If during an Auto Test the cable is assessed as bad (display FAIL Near or FAIL Far), it
must not be used for a maximum length data bus. This cable must only be used for a
reduced cable length. The maximum permissible lengths can be worked out with di-
minished thresholds (templates).
Example for LON and C-Bus
Templates for
CerCom/LON
LONV1_Q1
LONV1_Q2
LONV1_Q3
LONV1_Q4
Q1 ... Q4 not complied with
-----
Measures to be taken in the event of an error
LED-LCD display
Fail Near lights red
LED
Fail Far lights red
Meas. function lights red
LCD
Remote not found
--------
5.3.5
Check cable continuity
The function Pair Detect simplifies the location of a wire pair in a bundle of cables.
1. On the transmission side generate a signal tone with the Pair Detect key
LED Tone TX lights up green
2. On the receiver side generate a signal tone with the Pair Detect key
LED Tone RX lights up green
If continuity is positive a signal tone is sounded
Templates for
CBUS
CBUSV1_Q1
CBUSV1_Q2
CBUSV1_Q3
CBUSV1_Q4
-----
Q1 ... Q4 not complied with
Comment
With one measuring function a
threshold was exceeded at the
near and/or far end
The Master does not recognize the
partner device
No results are available
Assessment
no reduction of maximum length
reduction of maximum length by 15%
reduction of maximum length by 30%
reduction of maximum length by 50%
reduction of max. length to 500m
equivalent to free bus topology
Cable cannot be used
Measures
-
Repeat measurement with
diminished threshold
-
Check cable sections individu-
ally
-
Check continuity
-
Pair detection
-
Check cable sections individu-
ally
For measurement see section
5.3.5
-
17
e3180a.doc
12.2000
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