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emVIEW-7/RPI3 (Hardware and Software Manual) • Programming Information
6 - 26
6.4
CAN
The CAN controller is clocked by a 16 MHz crystal.
6.5
Serial Port (RS232/RS485)
The UART is clocked by a 1.8432 MHz oscillator.
When in RS485 mode, the transmitter is controlled by the UART's RTS signal. A low enables the
transmitter.
The receiver is disabled whenever the transmitter is enabled, hence transmitted characters are not
received. It is possible to modify the hardware such that the receiver is always enabled, to allow
verification of transmitted characters. Ask for details if you need to make such a modification.
6.6
Digital IO
The digital inputs and outputs are controlled by Raspberry PI GPIO signals.
IO
DI1
DI2
DI3
DI4
DO1
DO2
DO3
DO4
To turn digital output on (drive VIO to the output), set the GPIO to high state. All other states (low,
high-Z or weak pullup) will turn the digital output off.
Digital input GPIOs must be configured as input. A high level will be detected if sufficient voltage is
detected on the digital input pin.
Programming the digital inputs and outputs is the same as on a standard Raspberry PI 2 B, so you
can get more information on
6.7
Console RS232
On Raspbian based installations, by default this port is configured as a serial Linux console and you
can log into the Raspberry using a standard serial (null modem) cable and a terminal program like
"Putty". Use the following settings to log in: Speed (baud rate): 115200, Bits: 8, Parity: None, Stop
Bits: 1, Flow Control: None
To permanently disable the serial console and use this port for RS232 (2 wire) connections with the
device name /dev/ttyAMA0, the tool "raspi-config" allows the configuration in menu, 8 Advanced
Options, A7 Serial and "No". (if you need 4-wire RS232, use the RS232/RS485 port, see 3.2.5)
6.8
Overclocking
The thermal design of the emVIEW-7/RPI3 does not support CPU overclocking. Changing the CPU
parameters (CPU MHz, Voltage) is not recommended as it will permanently set a fuse in your SoC and
void your warranty.
© Janz Tec AG
GPIO
GPIO6 (Pin 31)
GPIO13 (Pin 33)
GPIO16 (Pin 36)
GPIO19 (Pin 35)
GPIO23 (Pin16)
GPIO22 (Pin 15)
GPIO27 (Pin 13)
GPIO18 (Pin 12)
http://elinux.org/RPi_Low-level_peripherals#Shell
Rev. 1.0
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