Function
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D000011142 en k – E65C CU-B1, B2, B4 – User Manual
© Gyr
4.3 RS232
interface
The asymmetric, serial, asynchronous bi-directional RS232 interface com-
plies with the standard of DIN 66259. Via the RS232 interface of the com-
munication unit CU-Bx
an external modem can be operated, e.g. for data transfer with a
central, or
a direct connection to the RS232 interface of a computer can be estab-
lished.
Depending on the version the RS232 interface supports only the commu-
nication protocol according to IEC 61107 or the communication according
to IEC 61107 and to DLMS.
The RS232 standard defines various data and control signals (see section
5.4.3 "Pin allocation RS232").
In the "transparent" version the interface only performs the communication
and requires a so-called intelligent external modem for this purpose.
In the version with additional functions the interface controls and monitors
an external modem and can operate with time-windows. It is then depend-
ent on a transparent external modem.
4.3.1
Receive and transmit times
When used in the telephone answering mode TAB, the control centre peri-
odically calls the measuring point to read the data, synchronize the time or
to transmit timer tables or other parameters.
The receive time can be limited for incoming calls in order to operate other
units with the same telephone line.
If the units are connected in parallel with the same telephone line, the num-
ber of ringing tones determines the priority. The modem accepts incoming
calls immediately within the receive time. Outside the receiving time, how-
ever, it does not accept incoming calls at all or only after a large number of
ringing tones.
The time-window determines how and at what times the meter can com-
municate with the control centre for remote reading:
No readiness
The (external) modem is out of service.
Reception at all times, daily, weekly or monthly
In this mode of operation the modem always accepts incoming calls
from the control centre for remote reading or in defined time-windows
according to the form of ringing tones defined under "Modem settings".
Outside this communication window the modem can also accept in-
coming calls following a freely parameterised number of ringing tones.
Protocol
Time-window
