Title: +038=370.101-OE002T_02-Multical 801 Energimåler Kamstrup - Teknisk beskrivelse.pdf
11.1.10 Wireless M-Bus (67-00-31) (PCB 5550-1386) The Wireless M-Bus module has been developed to be integrated in an ”Open Metering System” (OMS) solution without further configuration, and operates within the unlicensed frequency band in the 868 MHz area. The communication protocol is T-mode according to OMS specifications: Volume 2: Primary Communication Version 4.0.2, and the module uses one-way communication, data being automatically sent from the meter after installation, every 15 minutes from module 67-00-31. The T1 OMS module supports individual encryption and comes with internal antenna as well as MCX connection for external antenna. Kamstrup recommend that an external antenna is mounted on this module if the meter is fitted with a top module too. This ensures the best possible radio range. Photo see above paragraph 11.1.9.