External Interfaces Description10 DLR-PR001-XXGPIO PortThe reader has 13 GPIO bidirectional pins to be used tocontrol external devices or to send trigger signals to thereader. All GPIOs are TTL Levels. (See the ProductReference Guide for more details and instructions on howto use them). A DB15 external connector is available:Figure 8. DB15 Socket ConnectorPin # Signal Description1 GPIO0 General Purpose I/O 02 GPIO2 General Purpose I/O 23 GPIO4 General Purpose I/O 44 GPIO6 General Purpose I/O 65 GPIO8 General Purpose I/O 86 GPIO10 General Purpose I/O 107 GPIO12 General Purpose I/O 128 GND Ground9 GPIO1 General Purpose I/O 110 GPIO3 General Purpose I/O 311 GPIO5 General Purpose I/O 512 GPIO7 General Purpose I/O 713 GPIO9 General Purpose I/O 914 GPIO11 General Purpose I/O 1115 DC_BYPASS Input supply voltage bypass (500mA max)Shell External shell