Kipp&Zonen COMBILOG Data Logger - Manual (Page 97)

10.9 Potential Equalization
The difference between the actual physical voltage potentials
DGND of all connections with the bus must not exceed ±7 Volt.
If this cannot be guaranteed, an equalization has to be
provided. For most of the connections this means that the
minus connection of the power supply has to be fed-through as
a compensating line from connection to connection.
10.10 Adjustment of Address and Baud Rate
Before a control unit (PLC) or a computer (PC) can interchange
data with a data logger via the bus, address and baud rate for
the data logger have to be defined. Following hints have to be
considered:
 All devices have to be adjusted to the same baud rate.
 Within the bus topology the same address must not ap-
pear twice.
bus parameter ASCII-protocol /
MODBUS-Protocol
PROFIBUS-protocol
address 1 ..... 127 1 ..... 126
2,400 bps -
baud rate 4,800 bps -
9,600 bps 9,600 bps
19,200 bps 19,200 bps
38,400 bps -
Table 10.3 Setting variants for address and baud rate
for the data logger COMBILOG 1022
Hardware Manual COMBILOG 1022
97