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Serial ports
94
Manual
DLoG X Series
12.3.
Cable lengths and ground loops
Note that according to the EIA-232-E specification, the maximum cable length is 15 m at
19,200 bps.
By using a correctly terminated twisted-pair cable, however, up to 1.200 m at 100 kbps
can be achieved according to the EIA-422-A specification. With a data rate of 1 Mbps
and a high-quality cable, it is possible to reach line lengths of up to approximately 400 m.
Malfunctions in the RS-232 connections are frequently caused by ground loops. If both
end devices establish a ground connection via RS-232 but do not share the same ground
potential in their power supply circuits, then compensation currents may result. This is
particularly noticeable with long cables.
These compensation currents, which are also present at the ground point of the RS-232
connection, may significantly degrade signal quality and effectively stop the data flow. In
challenging environments, electrically-isolated connections (via external converters) or
differential systems (RS-422/485 standard) are strongly recommended.
Содержание DLoG X 10
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Страница 55: ...Initial operation DLoG X Series Manual 43 COM2 Options 13 Audio Option ...
Страница 60: ...Initial operation 48 Manual DLoG X Series Figure 5 9 External connectors DLoG X 12 X 12 AC 110 230 V 100 W ...
Страница 87: ...Boot loader DLoG X Series Manual 75 Figure 9 2 Boot loader diagram 2 ...
Страница 109: ...Audio Option DLoG X Series Manual 97 Figure 13 2 Audio port circuit diagram ...