Manual Supercom 636 R+W rev. 010312 9
4. Communication
4.1 Introduction
The radio modem Supercom 636 uses the M-Bus protocol according to EN1434 to communicate. It
supports primary and secondary addressing. For more detailed information, please refer to the M-
Bus documentation available on the internet:
://www.m-bus.com/
4.1.1 Reading concept
The radio modem is like 2 separate devices:
1. The modem itself
2. The device to be read
Each device can be accessed with its secondary address (serial number) or primary address:
Primary address for modem 636: 251
Primary address for device to be read: 254
The 636 has a local memory which can contain the information (address and readout method) of
the radio device to be read (maximum one).
The 636 contains two frames.
1. Modem information
2. Device to read information (address and readout method) if present
To read a radio device (e.g Radio module Supercom 580) the necessary information (radio ad-
dress and readout method) must be introduced into the local memory with the
command “SND_UD”
containing the field “Add entry to device list”.
The radio communication is started with the
command “SND_UD”
containing the field “Start read radio process”.
Sending a request to the radio modem Supercom 636 during the radio process will return a “busy”
frame. (3. / page 12).
To read the result send a request “REQ_UD2” to the device address “254”.
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