18/30 Function
© Landis+Gyr D000011142 en k – E65C CU-B1, B2, B4 – User Manual
Application 3
etc.
ISDN / PSTN / GSM
METCOM etc.
Modem
permanent connection
for remote reading
free for local
(temporary)
connection to
laptop / PC
RS232
Meter with
CU-B1/B4
RS485
RS232
Meter with
CU-B1/B4
RS485
RS232
Meter with
CU-B1/B4
RS485
Fig. 14 Example of an application of several CU-B1/B4
As in the first example, several (up to 32) ZxDxxxAT/CT meters can be
connected via the RS485 interface for common readout. The difference to
application 1, however, is that all communication units have a free RS232
interface, which can serve for temporary service functions or fixed commu-
nication.
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