Hardware Manual COMBILOG 1020
89
10
STRUCTURE OF THE BUS TOPOLOGY
The coupling of the datalogger
COMBILOG 1020
to a communi-
cation bus is performed via an integrated RS485 interface. The
second interface, the RS232 computer interface, is only useable
in order to build point-to-point connections for a distance of max.
20 m (65 feet). At the
COMBILOG 1020
the same data will per-
manently be given out. Only the physical characteristics of the
two interfaces are different whereas only those of the RS485 are
appropriate in order to build a bus topology. The RS485 bus to-
pology is characterized by the following features:
Bus interface:
RS485, half duplex
Bus topology:
line pattern, closed at both ends by the characteristic impe-
dance, stub cable to the party max. 30 cm (12 inch).
Bus medium:
shielded, twisted pair cable
Transmission speed:
ASCII-protocol: 2400 / 4800 / 9600 / 19200 bps / 38400 bps
PROFIBUS-protocol: 9.6 / 19.2 kbps / 38.4 kbps
Summary of Contents for COMBILOG 1020
Page 1: ...COMBILOG 1020 Datalogger Hardware Manual Version 3 09...
Page 2: ...Hardware Manual COMBILOG 1020 2 Issue 03 11 2005 Technical data are subject to change...
Page 4: ...Hardware Manual COMBILOG 1020 4...
Page 6: ...Hardware Manual COMBILOG 1020 6...
Page 12: ...Hardware Manual COMBILOG 1020 12...
Page 86: ...Hardware Manual COMBILOG 1020 86 Bild 8 1 Example Master Slave System...
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