MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
12 Data communication
12.1 MULTICAL
403 Data Protocol
Internal data communication in MULTICAL
403 is based on the Kamstrup Meter Protocol (KMP) which provides a
fast and flexible reading structure and also fulfils future requirements to data reliability.
The KMP protocol is used in all Kamstrup consumption meters launched from 2006 onwards. The protocol is used for
the optical interface and via plug pins for the module area. Thus, modules with e.g. M-Bus interface use the KMP
protocol internally and the M-Bus protocol externally.
Integrity and authenticity of data
All data parameters include type, measuring unit, scaling factor and CRC16 check sum.
Every produced meter includes a unique identification number.
12.2 Optical interface
The optical read-out head can be used for data communication via the optical interface. The optical read-out head is
placed on the front of the calculator just above the IR-diode as shown in the picture below. Please note that the
optical read-out head includes a very strong magnet, which should be protected by means of an iron disc when not
in use.
Various variants of the optical read-out head appear from the list of accessories (see paragraph 3.2.1).
12.2.1 Power-saving in connection with the optical interface
In order to limit the power consumption of the circuit around the IR-diode, the meter includes a magnet sensor
which switches off the circuit when there is no magnet near it.
12.3 Data protocol
Utilities and other relevant companies who want to develop their own communication driver for the KMP protocol
can order a demonstration program in C# (.net based) as well as a detailed protocol description (in English language).
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