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4 Design and Functions
NOTICE
Connecting LSB modules to BT300 requires an LCM100 or LEM100 with an external power
supply 24 V SELV.
Connect VSM, DFM and LT3-F as needed on the LSB module.
Only connect H and L of the LCM’s LSB to the LT3-F.
NOTICE
Consider while wiring the LAMTEC SYSTEM BUS (LSB) following notes:
Activate the 120 terminating resistor at first and last device on LSB.
Set dip switch of BT300 module on position 1 (see chapter 8 Options).
When using LT3, pay attention to the device-related manuals.
We recommend for cable length and conductor cross-section with LSB:
Devices on LAMTEC SYSTEM BUS (LSB) must be connected in serial/row (see Fig. 4-18 Se-
rial BUS connection). The first and the last participant on LSB must be terminated with a ter-
mination resistor of 120 . All the other BUS participants are not allowed to be connected to
any termination resistor at all. A star wiring is not permitted (see Fig. 4-19 Star BUS connec-
tion).
For activation of the termination resistor, see also technical document LAMTEC SYSTEM
BUS (DLT6095).
Correct: Serial Wiring (in a row)
Fig. 4-18 Serial BUS connection
Incorrect: Star Wiring
Fig. 4-19 Star BUS connection
Length [m] Cross-section [mm
2
] Type
0 - 40 m 2x2x0,22 twisted pairs with shielding, impedance 120
40 - 300 m 2x2x0,34 twisted pairs with shielding, impedance 120
300 - 500 m 2x2x0,50 twisted pairs with shielding, impedance 120
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