Device description
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D000043188 en d
– E65C – CU-P40, P41, P42 – User Manual
© Gyr
1.4
Functions
A functional description of the communication unit CU-P4x is provided
separately. The following main functions are briefly summarised below.
1.4.1
GSM/GPRS modem
The mode of operation can either be parameterised as GSM modem or as
GPRS modem.
The
GSM modem
(GSM = Global System for Mobile Communication) is
approved according to various standards such as 3GPP release 4. It is a
wireless modem (Modulator-Demodulator) for the modulated remote
transmission of data via the mobile telephone network. The GSM modem
uses the 850 MHz, 900 MHz, 1800 MHz and 1900 MHz GSM frequency
bands.
The
GPRS modem
(GPRS = General Packet Radio Service) uses the
GSM network for data transmission, but sends and receives the data in
packets. The packet-oriented data transmission permits network usage
billing based on data volumes transmitted instead of connection time.
GPRS permits a wireless connection to the Internet by means of transmis-
sion protocol TCP/IP (Transmission Control Protocol/Internet Protocol).
1.4.2
CS interface
The serial bi-directional CS interface is standardised to IEC 62056-21 or
DIN 66258. It supports both the communication protocol to IEC 62056-21
as well as communication according to dlms and can be operated both
actively and passively.
1.4.3
RS232 interface
The RS232 interface is an asymmetrical, serial, asynchronous, bi-direc-
tional interface to DIN 66259. This interface can be used for the (tempo-
rary) connection of a PC or laptop, in order to communicate with the meter
independent of normal data acquisition. The RS232 interface of the com-
munication unit CU-P41 has no control lines (3-wire version).
1.4.4
RS485 interface
The serial bi-directional RS485 interface is standardised to ISO-8482. It is
basically intended for the connection of several meters (up to 31) using the
CU-P42 as the master.
