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Version: 4.0/1
vsm LCD Button Panels (LBP)
vsm LCD Button Panels User Manual
8.4.2
Rotary Encoder
Each rotary-encoder is a 50-click-per-360°-rotation encoder with three R/G/B LEDs. LEDs are controlled by the
corresponding
8.4.3
Serial Interface
Connector for data drive for external accessories:
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1 x RS422 via RJ45 connector
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Serial Baud Rate will be configured automatically by the master device (LBP panel) to 115200 Baud.
RS422 is a differential signal transfer. Each Tx and each Rx line has both signals, therefore it is absolutely
necessary that a twisted pair cable is used. External accessory connections can easily be done by preconfigured
standard shielded network cable (CAT5 or higher standard). To avoid potential difference between devices,
shielded cable and shielded plugs with ground potential on both sides should be used. (Metalized plug-covers of
RJ-45-plugs to touch ground-flange of RJ-45 connectors). Wrong wiring, wrong cables, wrong use of twisted pair
and non-shielded traces lead to shorter working distances. Bad connection at one of the core in twisted pair
traces may lead to a working unit, which seems to be working fine, but sometimes loses connection or showing
strange behaviour. Always use a cable-tester before installing vsmGear-products to make sure, that there will be
no unsuspected trouble with connected devices. Also check proper wiring of wire-shield-traces. We suggest
RS422 traces via shielded twisted pair cable not to exceed 100m (328 feet) in total length.