User Manual

ThingMagic Nano User Guide 6
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Recommended maximum receiver baud-rate errors for various character sizes are shown in the table
below.
General Purpose Input/Output (GPIO)
The four GPIO connections, provided through the ThingMagic Nano Digital Connector Signal Definition,
may be configured as inputs or outputs using the MercuryAPI. The GPIO pins should connect through 1
kOhm resistors to the module to ensure the input Voltage limits are maintained even if the module is shut
off.
Module power consumption can be increased by incorrect GPIO configuration. Similarly, the power
consumption of external equipment connected to the GPIOs can also be adversely affected.
On power up, ThingMagic Nano module configures its GPIOs as inputs to avoid contention from user
equipment that may be driving those lines. The input configuration is a 3.3-volt logic CMOS input and is
internally pulled down with a resistance value of between 20 and 60 kOhms (40 kOhms nominal). Lines
configured as inputs must be low whenever the module is turned off and low at the time the module is
turned on.
GPIOs may be reconfigured individually after power up to become outputs. Lines configured as outputs
consume no excess power if the output is left open.
Configuring GPIO Settings
The GPIO lines are configured as inputs or outputs through the MercuryAPI by setting the reader
configuration parameters /reader/gpio/inputList and /reader/gpio/outputList.The state of the lines can be
Get or Set using the gpiGet() and gpoSet() methods, respectively. See the programming language-specific
reference document included with the Mercury API.
Recommended Maximum Receiver Baud Rate Errors
Baud rate
Max total error Recommended max Rx error
Min (-5.26%) Max (+4%) Min (-2%) Max (+2%)
9600 9120 10000 9412 9796
19200 18240 20000 18823 19592
38400 36481 40000 37647 39184
57600 54722 60000 56470 58775
115200 109443 120000 112941 117551
230400 218886 240000 225882 235102
460800 437773 480000 451765 470204
921600 875546 960000 903529 940408