18
Communication via integrated radio
The integrated radio communication has the following specification:
Unidirectional
transmission
The module sends every 8 ... 256 s (variable, depending on protocol length)
typical radio transmitting power 10 dBm
≙
10 mW
Data actuality: online – no time delay between recording readings and data transfer
The integrated radio module always accesses the current meter counts
Transmission frequency: 868 MHz or 434 MHz
Various Hydrometer receivers are available for receiving the protocol (e.g. Bluetooth, GPRS,
LAN, …)
Encrypted protocol: Real Data Radio or Open Metering Standard (OMS)
Reading modes: Walk-By, Drive-By, Fixed Network
For difficult radio installations (shielding) and to short distance to the radio receiver also the
module set external radio can be used.
RS-232
Terminals suitable for a cable with 3 wires of 2.5 mm²
Protocol: M-Bus
Transmission speed: 300 or 2400 baud
The module contains a 3 wire terminal with marking 62 (Dat), 63 (Req) and 64 (GND). A special
adapter cable (code no. 087H0121) is required The coloured wires are to be connected as shown:
Fig. I
RS-232 module
RS-485
Terminals suitable for a cable with 4 wires of 2.5 mm²
Protocol:
M-Bus
Transmission speed: 2400 baud
The module contains a 4 wire terminal with marking “D+”, “D-”, “+12V” and “-12V”. The module
requires an external power supply of 12 V DC ±5 V.
Fig. J
RS-485 module
62 = brown
63 = white
64 = green