25 July 1996
Micro-reader Module
In the default continuous read mode, only those valid RO, R/W or MPT IDs that differ from the
previously read ID; or valid IDs read after a “NO READ”, are transferred via the SCI (Normal
Mode)
. T
he Micro-reader can be set to transfer all valid IDs that are read (Line Mode) by means of a
corresponding serial data command
.
Without synchronization the Micro-reader has a reading frequency of approximately 10 readouts per
second using a power burst duration of 50 ms.
2.1.6 Serial Communication
The two serial I/O pins are configured for 9600 Baud, 1 start bit, 8 data bits, no parity and 1 stop bit;
they can be connected directly to a communications driver to allow a half duplex communication
with a PC via its serial communications interface (for example: RS232 or RS422).
The communications protocol is specified in Section 3.
Handshake
The Micro-reader accepts handshake commands Xon/Xoff. When it receives an Xoff (13hex) the
Micro-reader stops its current operation and stops transmitting data via the serial port. It stays in
idle mode until Xon (11hex) is received when it continues with the previous mode/command.
During
this idle period the Micro-reader accepts commands via the serial port , however, it waits for its
execution until Xon is received. In this idle period the Micro-reader can store only one command.
Note:
While receiving a command protocol from the serial port Xon/Xoff is interpreted as
normal data without affecting the serial communication.
2.2 Connector Pins
The Micro-reader module has 30 pin connections which are shown in figure 3 and listed in table 1.
Figure 3: Micro-reader Pin Connections
