User's Guide

ThingMagic M3e User Guide
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On power up, ThingMagic M3e 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 kΩ (40 kΩ 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 gpioGet() and gpioSet() methods, respectively. See the programming language-
specific reference document included with the Mercury API.
Run Line
 The run line turns off the power supplies.
 Pull down to turn off the power supplies.
 Leave open to operate.
 This line is pulled up to module Vin through a 1 M Ohm resistor
 Turn off time = TBD
 Turn on time = 22 ms
DC Power Requirements
Voltage: 3.0 - 5.5 VDC
Current: 0.3 A typical at 5.0 V when reading; idle and sleep modes supported.