Contemporary-control-systems BASrouterLX Installation Guide User Manual download pdf (Page 11)

TD120100-0IC

After removing the router cover, three jumpers are accessible on a 6-pin jumper

block located near the EIA-485 connector. These impart 604 Ω of bias via the upper

jumper (pull-up) and the lower jumper (pull-down), and 130 Ω of termination

impedance with the middle jumper. With all three jumpers in place, the effective

termination resistance is 120 Ω — 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 Ω at each far end of the bus.

Figure 10 — Internal Termination and Bias

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Contemporary-control-systems BASrouterLX Installation Guide User Manual Page 11