Schmid Watson Guide d'installation Page 38

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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
29 Revision: 2002-09-10
Plug-in versions of ACU and CMU offer jumpers to connect a simple 120 parallel termination
to both differential wire pairs of the TMN bus.
ACU Plug-in: Closing J4 and J5 will activate the termination.
CMU Plug-in: Closing jumper ST4 and ST5 will activate the termination.
More for reasons of avoiding excessive ground currents than for signal quality, the grounding
configuration for the signal return path shown in Figure 3-16 is recommended for a TMN bus
connections with different ground levels at both ends.
Z
T
Z
T
CMU M
R
Tx A
Tx B
Rx A
Rx B
LTU MR
Tx A Tx B Rx A Rx B
SGND
LTU MR
Tx A
Tx B
Rx A
Rx B
SGND
Z
G
Z
T
Z
T
Z
G
Z
G
= Z
T
= 100
Logic Ground 1
Logic Ground
2
Figure 3-16: Termination for Long TMN Bus
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