20/23
Version: 4.0/1
vsm LCD Button Panels (LBP)
vsm LCD Button Panels User Manual
GPO-contact-wiring “dry relay output”:
8.3.3
External Serial Interface
Connector for data drive for external accessories:
§
1 x RS422 via RJ45 connector
§
1 x RS422 (loop through) via RJ45 connector
§
Serial Baud Rate will be configured automatically by the device to 115200 Baud.
RS422 is a differential signal transfer. Each Tx and each Rx line has both, therefore it is absolutely necessary
that a twisted pair cable is. 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 short 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.
8.3.4
Ethernet
Ethernet communication port to vsmStudio
It is understood that for proper operation each LBP panel is connected to an Ethernet-switch where the individual
port of the switch is in need to be set to “Auto-Negotiation”.
Pin
Signal
Color of a standard TIA-568A-shielded twisted pair patch
cable (CAT5 or higher)
1
TX+
white/green