Guntermann & Drunck RS232-Extender - Handbuch (Seite 17)

Guntermann & Drunck GmbH Installation and operating manual
for RS232 extenders
Page 7 Version 1.00
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x Cat.5 cable faulty
x Cat.5 cable is not plugged in properly
x A "Crossover" cat.5 cable is plugged in (crossover cables are normally
used for "Uplink" connections between Ethernet hubs, and the wiring
in the cable runs crosswise.)
x The cable is (much) too long
x Logic module LC4128V is not programmed
x One device in standard mode and one in slow mode have been
connected to one another
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x Interruption in a wire pair in the cat.5 cable
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x Cat.5 cable too long
x Poor plug connections