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3.4 Expansion Interfaces
The following interfaces allow for expandability of the TWR-RF-SNAP.
TWPRI Connector:
- Freescale standard connector for General Purpose Tower Plug-ins (TWRPIs)
- Allows for plug-in of several different sensors – ex.TWRPI-MMA7660 Accelerometer
- Interfaces to sensors via I
- See figure below for specific pin-out (J15 is the right connector, while J14 is the left connector)
UART1 (SNAP UART0):
- Connected to Physical Pins 36-37 – SNAP GPIO 14-15
- RX = Pin 37/GPIO_15, TX = 36/GPIO_14
- This serial port attaches to edge-connectors (elevator) for communication with other devices
within the Tower System
UART2 (SNAP UART1):
- USB connected to UART2 of the system (Physical Pins 21, 23-25) - SNAP GPIO 21-18
- RTS = Pin_21/GPIO_21, CTS= 23/GPIO_20, RX = 24/GPIO_19 , TX = 25/GPIO_18
- Used to upload firmware, factory default the SNAP settings, or erase a script (via Portal)
- Connected to the USB port
2
C and/or ADC (ADC 5-7)
TWR-RF-SNAP User's Manual
Page 10 of 22
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