Kipp&Zonen COMBILOG Data Logger - Manual (Page 87)

10 STRUCTURE OF THE BUS TOPOLOGY
The coupling of the data logger COMBILOG 1022 to a commu-
nication bus is performed via an integrated RS485 interface.
The second interface, the RS232 computer interface, is only
usablein order to build point-to-point connections for a distance
of max. 20 m (65 feet). At the COMBILOG 1022 the same data
will permanently 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 topology is characterized by the following features:
 Bus interface:
RS485, half duplex
 Bus topology:
line pattern, closed at both ends by the characteristic im-
pedance, stub cable to the party max. 30 cm (12 inch).
 Bus medium:
shielded, twisted pair cable
 Transmission speed:
ASCII-protocol:
●
2400 Bit/s
●
4800 Bit/s
●
9600 Bit/s
●
19200 Bit/s
●
38400 Bit/s
Hardware Manual COMBILOG 1022
87