User’s manual for Repeater MRx01B Power
M0079A1A.doc
Id.-No. 151775
Page 16
10-March-00
2.4 Control module SM 2009 ( Rev. 07 and higher )
The control module SM 2009 is a DOS compatible micro computer. The whole
communication between the operator and the Repeater can be done via the control module. By
using either the RS232 interface in connection with a modem card and a mobile the Repeater
can be controlled remotely or locally by using a VT100 terminal, i.e. a PC emulating the
VT100 terminal.
Frequency and gain, power down of RF stages and ALC can be controlled and status
messages can be received remotely. In case a modem or a mobile is connected, automatic
alarm messages can be received by the operator.
The data transfer between the control module SM 2009 and the mother board is realized by
the I²C-Bus system.
The I²C-Bus concept was developed by Philips for the serial connection of integrated circuits
within one device. Two wires, SDA - serial data and SCL - serial clock, carry information
between the devices connected to the bus. Each device is recognized by a unique address and
can operate either as transmitter or receiver. The MRx01B Power I²C-Bus concept is working
with a bit rate of 1.5 kbit/s.
All MRx01B Power configuration parameters are stored in an EEPROM on the control
module if a power supply failure occurs.
