TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
52
12 Data communication
12.1 Optical reading
An optical, infrared receiver/transmitter is placed on the front of MULTICAL
®
401. The data format fulfils IEC 870
in start mode and can then be converted into a producer specific format. A standardized optical reading head
with a permanent magnet is used for data reading and configuration. Flow meter position and selection of
measuring unit for accumulated energy can also be programmed by means of the optical reading head. To be able
to change this data, however, an internal connection must be made before programming as the data in question
is legal measuring data. If data cable 66-99-108 or verification equipment 66-99-385 are used, the internal
connection are integrated. Kamstrup’s reading head, type 66-99-102, can be connected to Kamstrup’s hand-
held terminal, MULTITERM, as well as a standard IBM compatible PC with Windows 98 or newer version installed.
For further information on functions in the hand-held terminal and programming software, please refer to
documentation for:
MULTITERM type 66-99-15X
METERTOOL type 66-99-702
Functioning
When the connected reading unit, MULTITERM, or the PC sends a recognizable request string, MULTICAL
®
401
answers with a data string 1-2 sec. after having received the request string. MULTICAL
®
401’s optical data reading
uses following communication setup:
300/1200 baud, 1 startbit, 7 databits, even parity, 2 stopbits
NB: Except from optical reading, section 12.2, the other data strings neither contain measuring units nor decimal
points (raw data). Information on decimal points can be seen from the CCC tables in this technical description.
12.2 Optical data reading
Following data can be read via the optical eye placed on the front of MULTICAL
®
401 and via the data terminals.
Command (300BAUD) Return string (300BAUD)
/?! [CR] [LF]
[ACK]000 [CR] [LF]
/KAM [0] MCC [CR] [LF]
[STX]0.0(11 digits C/N)
6.8(Energy * unit)
6.26(Volume * m3)
6.31(Hours * h) ! [CR] [LF] [ETX] [BCC]
Table 19
In general, the reading is built-up according to EN61107/IEC1107, Mode A, but BCC is calculated arithmatically
as on M-Bus and not as module 2-binary sum ISO1155.
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