Contemporary-control-systems BASrouterLX Installation Guide Manual de usuario Pagina 11

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TD120100-0IC
11
After removing the router cover, three jumpers are accessible on a 6-pin jumper
block located near the EIA-485 connector. These impart 604 of bias via the upper
jumper (pull-up) and the lower jumper (pull-down), and 130 of termination
impedance with the middle jumper. With all three jumpers in place, the effective
termination resistance is 120 consistent with the MS/TP standard. If the
router is not installed at the end of a segment, remove all the jumpers and install
120 at each far end of the bus.
Figure 10 Internal Termination and Bias
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