Asynchronous Serial Connection (Uart); Usage Of Gpios; Asynchronous Reset; Power Supply - Elatec TWN3 Multi ISO Technical Manual

2.4.2 Asynchronous Serial Connection (UART)

Because Nano Module Multi ISO is transmitting and receiving TTL levels, it can be directly connected
to a microcontroller. If you plan to run Nano Module Multi ISO at a PC, an appropriate interface
converter circuit must be connected.
By default, the reader starts communication at 9600 baud, 8 databits, 1 stopbit, no parity. The
baudrate can be increased up to 115200 baud in order to achieve a higher communication speed.

2.4.3 Usage of GPIOs

Nano Module Multi ISO provides four general purpose I/Os that can be configured individually. These
I/Os can be read and written via commands.
Please consider, that the GPIOs have limited current source and sink capability of max. 25mA. An
overcharge of GPIO-pins can damage the module!
A non self-oscillating beeper can also be connected to GPIO1. The tone length and frequency can be
controlled by commands.

2.4.4 Asynchronous Reset

In usual operating environments, the reset pin can be left floating. For an asynchronous hardware
reset pull the reset pin to a logic low level. Nano Module Multi ISO continues operation as soon as the
reset pin is released.

2.4.5 Power supply

A power supply of 4.5V – 5.5V must be applied between the VCC and GND pins. Please make sure
that the power supply provides a current capability of at least 120mA.

2.4.6 SAM

The reader supports connection of ISO7816 compatible SAM cards. The lines SAM_IO, SAM_CLK,
SAM_RST, VCC and GND have to be connected as follows:
SAM card
C1 C5
C2 C6
C3 C7
C4
C8
Elatec GmbH
Pad Line
C1 VCC
C2 SAM_RST
C3 SAM_CLK
C4 Leave open
C5 GND
C6 Leave open
C7 SAM_IO
C8 Leave open
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