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MCROEM User Manual
DPG-00604
ERG Confidential © ERG 2005
Page 9 of 20
Revision 1.0 / 11 October 2005
3 Module
architecture
The Control Board contains a microprocessor, non-volatile memory, and radio frequency
transmitting and receiving circuitry. This board communicates with smart cards via a RF link
provided by the Antenna Board, and to the host terminal or integrated product via a RS-422
or RS-232 serial protocol.
transmitting and receiving circuitry. This board communicates with smart cards via a RF link
provided by the Antenna Board, and to the host terminal or integrated product via a RS-422
or RS-232 serial protocol.
The Antenna Board consists of a printed circuit board with copper traces forming the
transmit and receive antenna. The board is attached to a ferrite plate and a metal back plate
that serves as a ground plane.
transmit and receive antenna. The board is attached to a ferrite plate and a metal back plate
that serves as a ground plane.
Control of a device LCD and device I/O is achieved via direct access to port pins and the
data bus on the CPU. By sending appropriate command instructions via the serial link, the
LCD and device I/O can be operated.
data bus on the CPU. By sending appropriate command instructions via the serial link, the
LCD and device I/O can be operated.
The module architecture is illustrated in Figure 3.
text
Comms
Buffer
CPU
RF
Controller
RF
Tx and Rx
Circuit
Host
Connector
SERIAL
HOST PORT
12Vdc
From
Host
Control Board 70-0700
LCD
Connector
I/O
Connector
Antenna Board
70-0694
Figure 3: Module Architecture
3.1 Electrical
specification
3.2
Host serial communication interface
Item
Description
MCR to Host
communication interface
communication interface
Serial
RS-232 and RS-422 full duplex.
MCR to host baud rate
Serial
9600bps to 460Kbps.